1.第一种写法, 不借助第三方工具,直接上代码

1.1Controller层代码:

import com.XXXX.service.UserService;
import com.XXXX.vo.requestVO.weiXinLoginRequestVo.WeiXinLoginRequestVO;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;@RestController
@RequestMapping("/weixin")
public class WxLoginController {@Autowiredprivate UserService userService;@ApiOperation("微信登录授权")@PostMapping("/login")public void weixinLogin(@RequestBody WeiXinLoginRequestVO weiXinLoginRequestVO) {userService.weixinLogin(weiXinLoginRequestVO);}}

1.2Controller的WeiXinLoginRequestVO代码:

import lombok.Data;@Data
public class WeiXinLoginRequestVO {// 用户登录凭证（有效期五分钟）。开发者需要在开发者服务器后台调用 auth.code2Session，使用 code 换取 openid 和 session_key 等信息// https://developers.weixin.qq.com/miniprogram/dev/api/open-api/login/wx.login.html@NotBlank(message = "code不能为空")private String code;// 不包括敏感信息的原始数据字符串，用于计算签名// https://developers.weixin.qq.com/miniprogram/dev/api/open-api/user-info/wx.getUserInfo.html@NotBlank(message = "rawData不能为空")private String rawData;// 使用 sha1( rawData + sessionkey ) 得到字符串，用于校验用户信息，详见 用户数据的签名验证和加解密// https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/signature.html@NotBlank(message = "signature不能为空")private String signature;// 加密算法的初始向量，详见 用户数据的签名验证和加解密// https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/signature.html#%E5%8A%A0%E5%AF%86%E6%95%B0%E6%8D%AE%E8%A7%A3%E5%AF%86%E7%AE%97%E6%B3%95@NotBlank(message = "iv不能为空")private String iv;// 包括敏感数据在内的完整用户信息的加密数据，详见 用户数据的签名验证和加解密// https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/signature.html#%E5%8A%A0%E5%AF%86%E6%95%B0%E6%8D%AE%E8%A7%A3%E5%AF%86%E7%AE%97%E6%B3%95@NotBlank(message = "encryptedData不能为空")private String encryptedData;}

1.3Service层代码:

import com.alibaba.fastjson.JSONObject;
import com.XXXX.dto.WeiXinResponseUserInfoDTO;
import com.XXXX.service.UserService;
import com.XXXX.util.AESUtil;
import com.XXXX.util.Base64;
import com.XXXX.util.HttpsUtils;
import com.XXXX.util.SHAUtil;
import com.XXXX.vo.requestVO.weiXinLoginRequestVo.WeiXinLoginRequestVO;
import java.util.HashMap;
import java.util.Map;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;@Service
@Slf4j
public class UserServiceImpl implements UserService {@Transactional(rollbackFor = Exception.class)@Overridepublic void weixinLogin(WeiXinLoginRequestVO weiXinLoginRequestVO) {// 获取前端传过来的数据startString code = weiXinLoginRequestVO.getCode();String rawData = weiXinLoginRequestVO.getRawData();String signature = weiXinLoginRequestVO.getSignature();String iv = weiXinLoginRequestVO.getIv();String encryptedData = weiXinLoginRequestVO.getEncryptedData();// 获取前端传过来的数据end// 获取openid和session_key  startMap<String, String> stringStringMap = builGetOpenIdAndSessionKeyMethod(code);String openid = stringStringMap.get("openid");String sessionKey = stringStringMap.get("session_key");// 获取openid和session_key  end// 数据签名校验startString signature2 = SHAUtil.SHA1(rawData + sessionKey);if (!StringUtils.equals(signature, signature2)) {log.info("数据签名校验失败");// 填写自己的业务逻辑..........................}// 数据签名校验endtry {// 解密数据  startbyte[] resultByte = decryptInfoMethod(encryptedData, sessionKey, iv);// 解密数据  endif (null != resultByte && resultByte.length > 0) {// 解密数据转成WeiXinResponseUserInfoDTO对象startString userInfo = new String(resultByte, "UTF-8");WeiXinResponseUserInfoDTO weiXinResponseUserInfoDTO = JSONObject.parseObject(userInfo, WeiXinResponseUserInfoDTO.class);// 解密数据转成WeiXinResponseUserInfoDTO对象end// 填写自己的业务逻辑..........................} else {log.info("微信登录解密用户信息失败");// 填写自己的业务逻辑..........................}} catch (Exception e) {log.info("微信登录解密用户信息异常");e.printStackTrace();// 填写自己的业务逻辑..........................}}private Map<String, String> builGetOpenIdAndSessionKeyMethod(String code) {// 构建请求微信接口获取openid和session_key的所需参数startMap<String, Object> pa = new HashMap<>(12);pa.put("appid", "填写自己的小程序的appid");pa.put("secret", "填写自己的小程序的secret");pa.put("js_code", code);pa.put("grant_type", "authorization_code");String openidUrl = "https://api.weixin.qq.com/sns/jscode2session";// 构建请求微信接口获取openid和session_key的所需参数end// 调用微信接口获取openid和session_key startJSONObject jsonObject = HttpsUtils.doPost(openidUrl, pa);String openid = jsonObject.getString("openid");String sessionKey = jsonObject.getString("session_key");// 调用微信接口获取openid和session_key end// 对openid和session_key进行判断startif (openid == null || sessionKey == null) {log.info("微信小程序授权失败，原因是:" + JSONObject.toJSONString(jsonObject));throw new RuntimeException("调用微信接口没有获取到openid或者sessionKey");}// 对openid和session_key进行判断endMap<String, String> result = new HashMap<>(6);result.put("openid", openid);result.put("session_key", sessionKey);return result;}private byte[] decryptInfoMethod(String encryptedData, String sessionKey, String iv) {try {// 解密用户信息startbyte[] encryptedDataB = Base64.decode(encryptedData);                                             // 被加密的数据byte[] sessionKeyB = Base64.decode(sessionKey);                                                 // 加密秘钥byte[] ivB = Base64.decode(iv);                                                                   // 偏移量byte[] resultByte = AESUtil.instance.decrypt(encryptedDataB, sessionKeyB, ivB);// 解密用户信息endreturn resultByte;} catch (Exception e) {log.info("解密微信信息出错，错误信息如下：");e.printStackTrace();// 填写自己的业务逻辑..........................}return null;}
}

1.4Service层Base64.decode()代码:

/*** <p>Encodes and decodes to and from Base64 notation.</p>* <p>Homepage: <a href="http://iharder.net/base64">http://iharder.net/base64</a>.</p>* * <p>Example:</p>* * <code>String encoded = Base64.encode( myByteArray );</code>* <br />* <code>byte[] myByteArray = Base64.decode( encoded );</code>** <p>The <tt>options</tt> parameter, which appears in a few places, is used to pass * several pieces of information to the encoder. In the "higher level" methods such as * encodeBytes( bytes, options ) the options parameter can be used to indicate such * things as first gzipping the bytes before encoding them, not inserting linefeeds,* and encoding using the URL-safe and Ordered dialects.</p>** <p>Note, according to <a href="http://www.faqs.org/rfcs/rfc3548.html">RFC3548</a>,* Section 2.1, implementations should not add line feeds unless explicitly told* to do so. I've got Base64 set to this behavior now, although earlier versions* broke lines by default.</p>** <p>The constants defined in Base64 can be OR-ed together to combine options, so you * might make a call like this:</p>** <code>String encoded = Base64.encodeBytes( mybytes, Base64.GZIP | Base64.DO_BREAK_LINES );</code>* <p>to compress the data before encoding it and then making the output have newline characters.</p>* <p>Also...</p>* <code>String encoded = Base64.encodeBytes( crazyString.getBytes() );</code>**** <p>* Change Log:* </p>* <ul>*  <li>v2.3.7 - Fixed subtle bug when base 64 input stream contained the*   value 01111111, which is an invalid base 64 character but should not*   throw an ArrayIndexOutOfBoundsException either. Led to discovery of*   mishandling (or potential for better handling) of other bad input*   characters. You should now get an IOException if you try decoding*   something that has bad characters in it.</li>*  <li>v2.3.6 - Fixed bug when breaking lines and the final byte of the encoded*   string ended in the last column; the buffer was not properly shrunk and*   contained an extra (null) byte that made it into the string.</li>*  <li>v2.3.5 - Fixed bug in {@link #encodeFromFile} where estimated buffer size*   was wrong for files of size 31, 34, and 37 bytes.</li>*  <li>v2.3.4 - Fixed bug when working with gzipped streams whereby flushing*   the Base64.OutputStream closed the Base64 encoding (by padding with equals*   signs) too soon. Also added an option to suppress the automatic decoding*   of gzipped streams. Also added experimental support for specifying a*   class loader when using the*   {@link #decodeToObject(String, int, ClassLoader)}*   method.</li>*  <li>v2.3.3 - Changed default char encoding to US-ASCII which reduces the internal Java*   footprint with its CharEncoders and so forth. Fixed some javadocs that were*   inconsistent. Removed imports and specified things like java.io.IOException*   explicitly inline.</li>*  <li>v2.3.2 - Reduced memory footprint! Finally refined the "guessing" of how big the*   final encoded data will be so that the code doesn't have to create two output*   arrays: an oversized initial one and then a final, exact-sized one. Big win*   when using the {@link #encodeBytesToBytes(byte[])} family of methods (and not*   using the gzip options which uses a different mechanism with streams and stuff).</li>*  <li>v2.3.1 - Added {@link #encodeBytesToBytes(byte[], int, int, int)} and some*   similar helper methods to be more efficient with memory by not returning a*   String but just a byte array.</li>*  <li>v2.3 - <strong>This is not a drop-in replacement!</strong> This is two years of comments*   and bug fixes queued up and finally executed. Thanks to everyone who sent*   me stuff, and I'm sorry I wasn't able to distribute your fixes to everyone else.*   Much bad coding was cleaned up including throwing exceptions where necessary *   instead of returning null values or something similar. Here are some changes*   that may affect you:*   <ul>*    <li><em>Does not break lines, by default.</em> This is to keep in compliance with*      <a href="http://www.faqs.org/rfcs/rfc3548.html">RFC3548</a>.</li>*    <li><em>Throws exceptions instead of returning null values.</em> Because some operations*      (especially those that may permit the GZIP option) use IO streams, there*      is a possiblity of an java.io.IOException being thrown. After some discussion and*      thought, I've changed the behavior of the methods to throw java.io.IOExceptions*      rather than return null if ever there's an error. I think this is more*      appropriate, though it will require some changes to your code. Sorry,*      it should have been done this way to begin with.</li>*    <li><em>Removed all references to System.out, System.err, and the like.</em>*      Shame on me. All I can say is sorry they were ever there.</li>*    <li><em>Throws NullPointerExceptions and IllegalArgumentExceptions</em> as needed*      such as when passed arrays are null or offsets are invalid.</li>*    <li>Cleaned up as much javadoc as I could to avoid any javadoc warnings.*      This was especially annoying before for people who were thorough in their*      own projects and then had gobs of javadoc warnings on this file.</li>*   </ul>*  <li>v2.2.1 - Fixed bug using URL_SAFE and ORDERED encodings. Fixed bug*   when using very small files (~&lt; 40 bytes).</li>*  <li>v2.2 - Added some helper methods for encoding/decoding directly from*   one file to the next. Also added a main() method to support command line*   encoding/decoding from one file to the next. Also added these Base64 dialects:*   <ol>*   <li>The default is RFC3548 format.</li>*   <li>Calling Base64.setFormat(Base64.BASE64_FORMAT.URLSAFE_FORMAT) generates*   URL and file name friendly format as described in Section 4 of RFC3548.*   http://www.faqs.org/rfcs/rfc3548.html</li>*   <li>Calling Base64.setFormat(Base64.BASE64_FORMAT.ORDERED_FORMAT) generates*   URL and file name friendly format that preserves lexical ordering as described*   in http://www.faqs.org/qa/rfcc-1940.html</li>*   </ol>*   Special thanks to Jim Kellerman at <a href="http://www.powerset.com/">http://www.powerset.com/</a>*   for contributing the new Base64 dialects.*  </li>* *  <li>v2.1 - Cleaned up javadoc comments and unused variables and methods. Added*   some convenience methods for reading and writing to and from files.</li>*  <li>v2.0.2 - Now specifies UTF-8 encoding in places where the code fails on systems*   with other encodings (like EBCDIC).</li>*  <li>v2.0.1 - Fixed an error when decoding a single byte, that is, when the*   encoded data was a single byte.</li>*  <li>v2.0 - I got rid of methods that used booleans to set options. *   Now everything is more consolidated and cleaner. The code now detects*   when data that's being decoded is gzip-compressed and will decompress it*   automatically. Generally things are cleaner. You'll probably have to*   change some method calls that you were making to support the new*   options format (<tt>int</tt>s that you "OR" together).</li>*  <li>v1.5.1 - Fixed bug when decompressing and decoding to a             *   byte[] using <tt>decode( String s, boolean gzipCompressed )</tt>.      *   Added the ability to "suspend" encoding in the Output Stream so        *   you can turn on and off the encoding if you need to embed base64       *   data in an otherwise "normal" stream (like an XML file).</li>  *  <li>v1.5 - Output stream pases on flush() command but doesn't do anything itself.*      This helps when using GZIP streams.*      Added the ability to GZip-compress objects before encoding them.</li>*  <li>v1.4 - Added helper methods to read/write files.</li>*  <li>v1.3.6 - Fixed OutputStream.flush() so that 'position' is reset.</li>*  <li>v1.3.5 - Added flag to turn on and off line breaks. Fixed bug in input stream*      where last buffer being read, if not completely full, was not returned.</li>*  <li>v1.3.4 - Fixed when "improperly padded stream" error was thrown at the wrong time.</li>*  <li>v1.3.3 - Fixed I/O streams which were totally messed up.</li>* </ul>** <p>* I am placing this code in the Public Domain. Do with it as you will.* This software comes with no guarantees or warranties but with* plenty of well-wishing instead!* Please visit <a href="http://iharder.net/base64">http://iharder.net/base64</a>* periodically to check for updates or to contribute improvements.* </p>** @author Robert Harder* @author rob@iharder.net* @version 2.3.7*/
public class Base64
{/* ********  P U B L I C   F I E L D S  ******** */   /** No options specified. Value is zero. */public final static int NO_OPTIONS = 0;/** Specify encoding in first bit. Value is one. */public final static int ENCODE = 1;/** Specify decoding in first bit. Value is zero. */public final static int DECODE = 0;/** Specify that data should be gzip-compressed in second bit. Value is two. */public final static int GZIP = 2;/** Specify that gzipped data should <em>not</em> be automatically gunzipped. */public final static int DONT_GUNZIP = 4;/** Do break lines when encoding. Value is 8. */public final static int DO_BREAK_LINES = 8;/** * Encode using Base64-like encoding that is URL- and Filename-safe as described* in Section 4 of RFC3548: * <a href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org/rfcs/rfc3548.html</a>.* It is important to note that data encoded this way is <em>not</em> officially valid Base64, * or at the very least should not be called Base64 without also specifying that is* was encoded using the URL- and Filename-safe dialect.*/public final static int URL_SAFE = 16;/*** Encode using the special "ordered" dialect of Base64 described here:* <a href="http://www.faqs.org/qa/rfcc-1940.html">http://www.faqs.org/qa/rfcc-1940.html</a>.*/public final static int ORDERED = 32;/* ********  P R I V A T E   F I E L D S  ******** */  /** Maximum line length (76) of Base64 output. */private final static int MAX_LINE_LENGTH = 76;/** The equals sign (=) as a byte. */private final static byte EQUALS_SIGN = (byte)'=';/** The new line character (\n) as a byte. */private final static byte NEW_LINE = (byte)'\n';/** Preferred encoding. */private final static String PREFERRED_ENCODING = "US-ASCII";private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in encodingprivate final static byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in encoding/* ********  S T A N D A R D   B A S E 6 4   A L P H A B E T  ******** */ /** The 64 valid Base64 values. *//* Host platform me be something funny like EBCDIC, so we hardcode these values. */private final static byte[] _STANDARD_ALPHABET = {(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U', (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u', (byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z',(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'+', (byte)'/'};/** * Translates a Base64 value to either its 6-bit reconstruction value* or a negative number indicating some other meaning.**/private final static byte[] _STANDARD_DECODABET = {-9,-9,-9,-9,-9,-9,-9,-9,-9,                 // Decimal  0 -  8-5,-5,                                      // Whitespace: Tab and Linefeed-9,-9,                                      // Decimal 11 - 12-5,                                         // Whitespace: Carriage Return-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 14 - 26-9,-9,-9,-9,-9,                             // Decimal 27 - 31-5,                                         // Whitespace: Space-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,              // Decimal 33 - 4262,                                         // Plus sign at decimal 43-9,-9,-9,                                   // Decimal 44 - 4663,                                         // Slash at decimal 4752,53,54,55,56,57,58,59,60,61,              // Numbers zero through nine-9,-9,-9,                                   // Decimal 58 - 60-1,                                         // Equals sign at decimal 61-9,-9,-9,                                      // Decimal 62 - 640,1,2,3,4,5,6,7,8,9,10,11,12,13,            // Letters 'A' through 'N'14,15,16,17,18,19,20,21,22,23,24,25,        // Letters 'O' through 'Z'-9,-9,-9,-9,-9,-9,                          // Decimal 91 - 9626,27,28,29,30,31,32,33,34,35,36,37,38,     // Letters 'a' through 'm'39,40,41,42,43,44,45,46,47,48,49,50,51,     // Letters 'n' through 'z'-9,-9,-9,-9,-9                              // Decimal 123 - 127,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,       // Decimal 128 - 139-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 140 - 152-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 153 - 165-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 166 - 178-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 179 - 191-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 192 - 204-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 205 - 217-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 218 - 230-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 231 - 243-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9         // Decimal 244 - 255 };/* ********  U R L   S A F E   B A S E 6 4   A L P H A B E T  ******** *//*** Used in the URL- and Filename-safe dialect described in Section 4 of RFC3548: * <a href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org/rfcs/rfc3548.html</a>.* Notice that the last two bytes become "hyphen" and "underscore" instead of "plus" and "slash."*/private final static byte[] _URL_SAFE_ALPHABET = {(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U', (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u', (byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z',(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'-', (byte)'_'};/*** Used in decoding URL- and Filename-safe dialects of Base64.*/private final static byte[] _URL_SAFE_DECODABET = {-9,-9,-9,-9,-9,-9,-9,-9,-9,                 // Decimal  0 -  8-5,-5,                                      // Whitespace: Tab and Linefeed-9,-9,                                      // Decimal 11 - 12-5,                                         // Whitespace: Carriage Return-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 14 - 26-9,-9,-9,-9,-9,                             // Decimal 27 - 31-5,                                         // Whitespace: Space-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,              // Decimal 33 - 42-9,                                         // Plus sign at decimal 43-9,                                         // Decimal 4462,                                         // Minus sign at decimal 45-9,                                         // Decimal 46-9,                                         // Slash at decimal 4752,53,54,55,56,57,58,59,60,61,              // Numbers zero through nine-9,-9,-9,                                   // Decimal 58 - 60-1,                                         // Equals sign at decimal 61-9,-9,-9,                                   // Decimal 62 - 640,1,2,3,4,5,6,7,8,9,10,11,12,13,            // Letters 'A' through 'N'14,15,16,17,18,19,20,21,22,23,24,25,        // Letters 'O' through 'Z'-9,-9,-9,-9,                                // Decimal 91 - 9463,                                         // Underscore at decimal 95-9,                                         // Decimal 9626,27,28,29,30,31,32,33,34,35,36,37,38,     // Letters 'a' through 'm'39,40,41,42,43,44,45,46,47,48,49,50,51,     // Letters 'n' through 'z'-9,-9,-9,-9,-9                              // Decimal 123 - 127,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 128 - 139-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 140 - 152-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 153 - 165-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 166 - 178-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 179 - 191-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 192 - 204-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 205 - 217-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 218 - 230-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 231 - 243-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9         // Decimal 244 - 255 };/* ********  O R D E R E D   B A S E 6 4   A L P H A B E T  ******** *//*** I don't get the point of this technique, but someone requested it,* and it is described here:* <a href="http://www.faqs.org/qa/rfcc-1940.html">http://www.faqs.org/qa/rfcc-1940.html</a>.*/private final static byte[] _ORDERED_ALPHABET = {(byte)'-',(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4',(byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9',(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',(byte)'_',(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',(byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z'};/*** Used in decoding the "ordered" dialect of Base64.*/private final static byte[] _ORDERED_DECODABET = {-9,-9,-9,-9,-9,-9,-9,-9,-9,                 // Decimal  0 -  8-5,-5,                                      // Whitespace: Tab and Linefeed-9,-9,                                      // Decimal 11 - 12-5,                                         // Whitespace: Carriage Return-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 14 - 26-9,-9,-9,-9,-9,                             // Decimal 27 - 31-5,                                         // Whitespace: Space-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,              // Decimal 33 - 42-9,                                         // Plus sign at decimal 43-9,                                         // Decimal 440,                                          // Minus sign at decimal 45-9,                                         // Decimal 46-9,                                         // Slash at decimal 471,2,3,4,5,6,7,8,9,10,                       // Numbers zero through nine-9,-9,-9,                                   // Decimal 58 - 60-1,                                         // Equals sign at decimal 61-9,-9,-9,                                   // Decimal 62 - 6411,12,13,14,15,16,17,18,19,20,21,22,23,     // Letters 'A' through 'M'24,25,26,27,28,29,30,31,32,33,34,35,36,     // Letters 'N' through 'Z'-9,-9,-9,-9,                                // Decimal 91 - 9437,                                         // Underscore at decimal 95-9,                                         // Decimal 9638,39,40,41,42,43,44,45,46,47,48,49,50,     // Letters 'a' through 'm'51,52,53,54,55,56,57,58,59,60,61,62,63,     // Letters 'n' through 'z'-9,-9,-9,-9,-9                                 // Decimal 123 - 127,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 128 - 139-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 140 - 152-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 153 - 165-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 166 - 178-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 179 - 191-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 192 - 204-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 205 - 217-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 218 - 230-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 231 - 243-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9         // Decimal 244 - 255 };/* ********  D E T E R M I N E   W H I C H   A L H A B E T  ******** *//*** Returns one of the _SOMETHING_ALPHABET byte arrays depending on* the options specified.* It's possible, though silly, to specify ORDERED <b>and</b> URLSAFE* in which case one of them will be picked, though there is* no guarantee as to which one will be picked.*/private final static byte[] getAlphabet( int options ) {if ((options & URL_SAFE) == URL_SAFE) {return _URL_SAFE_ALPHABET;} else if ((options & ORDERED) == ORDERED) {return _ORDERED_ALPHABET;} else {return _STANDARD_ALPHABET;}} // end getAlphabet/*** Returns one of the _SOMETHING_DECODABET byte arrays depending on* the options specified.* It's possible, though silly, to specify ORDERED and URL_SAFE* in which case one of them will be picked, though there is* no guarantee as to which one will be picked.*/private final static byte[] getDecodabet( int options ) {if( (options & URL_SAFE) == URL_SAFE) {return _URL_SAFE_DECODABET;} else if ((options & ORDERED) == ORDERED) {return _ORDERED_DECODABET;} else {return _STANDARD_DECODABET;}}  // end getAlphabet/** Defeats instantiation. */private Base64(){}/* ********  E N C O D I N G   M E T H O D S  ******** */    /*** Encodes up to the first three bytes of array <var>threeBytes</var>* and returns a four-byte array in Base64 notation.* The actual number of significant bytes in your array is* given by <var>numSigBytes</var>.* The array <var>threeBytes</var> needs only be as big as* <var>numSigBytes</var>.* Code can reuse a byte array by passing a four-byte array as <var>b4</var>.** @param b4 A reusable byte array to reduce array instantiation* @param threeBytes the array to convert* @param numSigBytes the number of significant bytes in your array* @return four byte array in Base64 notation.* @since 1.5.1*/private static byte[] encode3to4( byte[] b4, byte[] threeBytes, int numSigBytes, int options ) {encode3to4( threeBytes, 0, numSigBytes, b4, 0, options );return b4;}   // end encode3to4/*** <p>Encodes up to three bytes of the array <var>source</var>* and writes the resulting four Base64 bytes to <var>destination</var>.* The source and destination arrays can be manipulated* anywhere along their length by specifying * <var>srcOffset</var> and <var>destOffset</var>.* This method does not check to make sure your arrays* are large enough to accomodate <var>srcOffset</var> + 3 for* the <var>source</var> array or <var>destOffset</var> + 4 for* the <var>destination</var> array.* The actual number of significant bytes in your array is* given by <var>numSigBytes</var>.</p>* <p>This is the lowest level of the encoding methods with* all possible parameters.</p>** @param source the array to convert* @param srcOffset the index where conversion begins* @param numSigBytes the number of significant bytes in your array* @param destination the array to hold the conversion* @param destOffset the index where output will be put* @return the <var>destination</var> array* @since 1.3*/private static byte[] encode3to4( byte[] source, int srcOffset, int numSigBytes,byte[] destination, int destOffset, int options ) {byte[] ALPHABET = getAlphabet( options ); //           1         2         3  // 01234567890123456789012345678901 Bit position// --------000000001111111122222222 Array position from threeBytes// --------|    ||    ||    ||    | Six bit groups to index ALPHABET//          >>18  >>12  >> 6  >> 0  Right shift necessary//                0x3f  0x3f  0x3f  Additional AND// Create buffer with zero-padding if there are only one or two// significant bytes passed in the array.// We have to shift left 24 in order to flush out the 1's that appear// when Java treats a value as negative that is cast from a byte to an int.int inBuff =   ( numSigBytes > 0 ? ((source[ srcOffset     ] << 24) >>>  8) : 0 )| ( numSigBytes > 1 ? ((source[ srcOffset + 1 ] << 24) >>> 16) : 0 )| ( numSigBytes > 2 ? ((source[ srcOffset + 2 ] << 24) >>> 24) : 0 );switch( numSigBytes ){case 3:destination[ destOffset     ] = ALPHABET[ (inBuff >>> 18)        ];destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>>  6) & 0x3f ];destination[ destOffset + 3 ] = ALPHABET[ (inBuff       ) & 0x3f ];return destination;case 2:destination[ destOffset     ] = ALPHABET[ (inBuff >>> 18)        ];destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>>  6) & 0x3f ];destination[ destOffset + 3 ] = EQUALS_SIGN;return destination;case 1:destination[ destOffset     ] = ALPHABET[ (inBuff >>> 18)        ];destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];destination[ destOffset + 2 ] = EQUALS_SIGN;destination[ destOffset + 3 ] = EQUALS_SIGN;return destination;default:return destination;}   // end switch}   // end encode3to4/*** Performs Base64 encoding on the <code>raw</code> ByteBuffer,* writing it to the <code>encoded</code> ByteBuffer.* This is an experimental feature. Currently it does not* pass along any options (such as {@link #DO_BREAK_LINES}* or {@link #GZIP}.** @param raw input buffer* @param encoded output buffer* @since 2.3*/public static void encode( java.nio.ByteBuffer raw, java.nio.ByteBuffer encoded ){byte[] raw3 = new byte[3];byte[] enc4 = new byte[4];while( raw.hasRemaining() ){int rem = Math.min(3,raw.remaining());raw.get(raw3,0,rem);Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS );encoded.put(enc4);}   // end input remaining}/*** Performs Base64 encoding on the <code>raw</code> ByteBuffer,* writing it to the <code>encoded</code> CharBuffer.* This is an experimental feature. Currently it does not* pass along any options (such as {@link #DO_BREAK_LINES}* or {@link #GZIP}.** @param raw input buffer* @param encoded output buffer* @since 2.3*/public static void encode( java.nio.ByteBuffer raw, java.nio.CharBuffer encoded ){byte[] raw3 = new byte[3];byte[] enc4 = new byte[4];while( raw.hasRemaining() ){int rem = Math.min(3,raw.remaining());raw.get(raw3,0,rem);Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS );for( int i = 0; i < 4; i++ ){encoded.put( (char)(enc4[i] & 0xFF) );}}   // end input remaining}/*** Serializes an object and returns the Base64-encoded* version of that serialized object.  *  * <p>As of v 2.3, if the object* cannot be serialized or there is another error,* the method will throw an java.io.IOException. <b>This is new to v2.3!</b>* In earlier versions, it just returned a null value, but* in retrospect that's a pretty poor way to handle it.</p>* * The object is not GZip-compressed before being encoded.** @param serializableObject The object to encode* @return The Base64-encoded object* @throws java.io.IOException if there is an error* @throws NullPointerException if serializedObject is null* @since 1.4*/public static String encodeObject( java.io.Serializable serializableObject )throws java.io.IOException {return encodeObject( serializableObject, NO_OPTIONS );}   // end encodeObject/*** Serializes an object and returns the Base64-encoded* version of that serialized object.*  * <p>As of v 2.3, if the object* cannot be serialized or there is another error,* the method will throw an java.io.IOException. <b>This is new to v2.3!</b>* In earlier versions, it just returned a null value, but* in retrospect that's a pretty poor way to handle it.</p>* * The object is not GZip-compressed before being encoded.* <p>* Example options:<pre>*   GZIP: gzip-compresses object before encoding it.*   DO_BREAK_LINES: break lines at 76 characters* </pre>* <p>* Example: <code>encodeObject( myObj, Base64.GZIP )</code> or* <p>* Example: <code>encodeObject( myObj, Base64.GZIP | Base64.DO_BREAK_LINES )</code>** @param serializableObject The object to encode* @param options Specified options* @return The Base64-encoded object* @see com.jd.app.server.security.Base64#GZIP* @see com.jd.app.server.security.Base64#DO_BREAK_LINES* @throws java.io.IOException if there is an error* @since 2.0*/public static String encodeObject( java.io.Serializable serializableObject, int options )throws java.io.IOException {if( serializableObject == null ){throw new NullPointerException( "Cannot serialize a null object." );}   // end if: null// Streamsjava.io.ByteArrayOutputStream  baos  = null; java.io.OutputStream           b64os = null;java.util.zip.GZIPOutputStream gzos  = null;java.io.ObjectOutputStream     oos   = null;try {// ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStreambaos  = new java.io.ByteArrayOutputStream();b64os = new OutputStream( baos, ENCODE | options );if( (options & GZIP) != 0 ){// Gzipgzos = new java.util.zip.GZIPOutputStream(b64os);oos = new java.io.ObjectOutputStream( gzos );} else {// Not gzippedoos = new java.io.ObjectOutputStream( b64os );}oos.writeObject( serializableObject );}   // end trycatch( java.io.IOException e ) {// Catch it and then throw it immediately so that// the finally{} block is called for cleanup.throw e;}   // end catchfinally {try{ oos.close();   } catch( Exception e ){}try{ gzos.close();  } catch( Exception e ){}try{ b64os.close(); } catch( Exception e ){}try{ baos.close();  } catch( Exception e ){}}   // end finally// Return value according to relevant encoding.try {return new String( baos.toByteArray(), PREFERRED_ENCODING );}   // end trycatch (java.io.UnsupportedEncodingException uue){// Fall back to some Java defaultreturn new String( baos.toByteArray() );}   // end catch}   // end encode/*** Encodes a byte array into Base64 notation.* Does not GZip-compress data.*  * @param source The data to convert* @return The data in Base64-encoded form* @throws NullPointerException if source array is null* @since 1.4*/public static String encodeBytes( byte[] source ) {// Since we're not going to have the GZIP encoding turned on,// we're not going to have an java.io.IOException thrown, so// we should not force the user to have to catch it.String encoded = null;try {encoded = encodeBytes(source, 0, source.length, NO_OPTIONS);} catch (java.io.IOException ex) {assert false : ex.getMessage();}   // end catchassert encoded != null;return encoded;}   // end encodeBytes/*** Encodes a byte array into Base64 notation.* <p>* Example options:<pre>*   GZIP: gzip-compresses object before encoding it.*   DO_BREAK_LINES: break lines at 76 characters*     <i>Note: Technically, this makes your encoding non-compliant.</i>* </pre>* <p>* Example: <code>encodeBytes( myData, Base64.GZIP )</code> or* <p>* Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )</code>**  * <p>As of v 2.3, if there is an error with the GZIP stream,* the method will throw an java.io.IOException. <b>This is new to v2.3!</b>* In earlier versions, it just returned a null value, but* in retrospect that's a pretty poor way to handle it.</p>* ** @param source The data to convert* @param options Specified options* @return The Base64-encoded data as a String* @see com.jd.app.server.security.Base64#GZIP* @see com.jd.app.server.security.Base64#DO_BREAK_LINES* @throws java.io.IOException if there is an error* @throws NullPointerException if source array is null* @since 2.0*/public static String encodeBytes( byte[] source, int options ) throws java.io.IOException {return encodeBytes( source, 0, source.length, options );}   // end encodeBytes/*** Encodes a byte array into Base64 notation.* Does not GZip-compress data.*  * <p>As of v 2.3, if there is an error,* the method will throw an java.io.IOException. <b>This is new to v2.3!</b>* In earlier versions, it just returned a null value, but* in retrospect that's a pretty poor way to handle it.</p>* ** @param source The data to convert* @param off Offset in array where conversion should begin* @param len Length of data to convert* @return The Base64-encoded data as a String* @throws NullPointerException if source array is null* @throws IllegalArgumentException if source array, offset, or length are invalid* @since 1.4*/public static String encodeBytes( byte[] source, int off, int len ) {// Since we're not going to have the GZIP encoding turned on,// we're not going to have an java.io.IOException thrown, so// we should not force the user to have to catch it.String encoded = null;try {encoded = encodeBytes( source, off, len, NO_OPTIONS );} catch (java.io.IOException ex) {assert false : ex.getMessage();}   // end catchassert encoded != null;return encoded;}   // end encodeBytes/*** Encodes a byte array into Base64 notation.* <p>* Example options:<pre>*   GZIP: gzip-compresses object before encoding it.*   DO_BREAK_LINES: break lines at 76 characters*     <i>Note: Technically, this makes your encoding non-compliant.</i>* </pre>* <p>* Example: <code>encodeBytes( myData, Base64.GZIP )</code> or* <p>* Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )</code>**  * <p>As of v 2.3, if there is an error with the GZIP stream,* the method will throw an java.io.IOException. <b>This is new to v2.3!</b>* In earlier versions, it just returned a null value, but* in retrospect that's a pretty poor way to handle it.</p>* ** @param source The data to convert* @param off Offset in array where conversion should begin* @param len Length of data to convert* @param options Specified options* @return The Base64-encoded data as a String* @see com.jd.app.server.security.Base64#GZIP* @see com.jd.app.server.security.Base64#DO_BREAK_LINES* @throws java.io.IOException if there is an error* @throws NullPointerException if source array is null* @throws IllegalArgumentException if source array, offset, or length are invalid* @since 2.0*/public static String encodeBytes( byte[] source, int off, int len, int options ) throws java.io.IOException {byte[] encoded = encodeBytesToBytes( source, off, len, options );// Return value according to relevant encoding.try {return new String( encoded, PREFERRED_ENCODING );}   // end trycatch (java.io.UnsupportedEncodingException uue) {return new String( encoded );}   // end catch}   // end encodeBytes/*** Similar to {@link #encodeBytes(byte[])} but returns* a byte array instead of instantiating a String. This is more efficient* if you're working with I/O streams and have large data sets to encode.*** @param source The data to convert* @return The Base64-encoded data as a byte[] (of ASCII characters)* @throws NullPointerException if source array is null* @since 2.3.1*/public static byte[] encodeBytesToBytes( byte[] source ) {byte[] encoded = null;try {encoded = encodeBytesToBytes( source, 0, source.length, Base64.NO_OPTIONS );} catch( java.io.IOException ex ) {assert false : "IOExceptions only come from GZipping, which is turned off: " + ex.getMessage();}return encoded;}/*** Similar to {@link #encodeBytes(byte[], int, int, int)} but returns* a byte array instead of instantiating a String. This is more efficient* if you're working with I/O streams and have large data sets to encode.*** @param source The data to convert* @param off Offset in array where conversion should begin* @param len Length of data to convert* @param options Specified options* @return The Base64-encoded data as a String* @see com.jd.app.server.security.Base64#GZIP* @see com.jd.app.server.security.Base64#DO_BREAK_LINES* @throws java.io.IOException if there is an error* @throws NullPointerException if source array is null* @throws IllegalArgumentException if source array, offset, or length are invalid* @since 2.3.1*/public static byte[] encodeBytesToBytes( byte[] source, int off, int len, int options ) throws java.io.IOException {if( source == null ){throw new NullPointerException( "Cannot serialize a null array." );}   // end if: nullif( off < 0 ){throw new IllegalArgumentException( "Cannot have negative offset: " + off );}   // end if: off < 0if( len < 0 ){throw new IllegalArgumentException( "Cannot have length offset: " + len );}   // end if: len < 0if( off + len > source.length  ){throw new IllegalArgumentException(String.format( "Cannot have offset of %d and length of %d with array of length %d", off,len,source.length));}   // end if: off < 0// Compress?if( (options & GZIP) != 0 ) {java.io.ByteArrayOutputStream  baos  = null;java.util.zip.GZIPOutputStream gzos  = null;OutputStream            b64os = null;try {// GZip -> Base64 -> ByteArraybaos = new java.io.ByteArrayOutputStream();b64os = new OutputStream( baos, ENCODE | options );gzos  = new java.util.zip.GZIPOutputStream( b64os );gzos.write( source, off, len );gzos.close();}   // end trycatch( java.io.IOException e ) {// Catch it and then throw it immediately so that// the finally{} block is called for cleanup.throw e;}   // end catchfinally {try{ gzos.close();  } catch( Exception e ){}try{ b64os.close(); } catch( Exception e ){}try{ baos.close();  } catch( Exception e ){}}   // end finallyreturn baos.toByteArray();}   // end if: compress// Else, don't compress. Better not to use streams at all then.else {boolean breakLines = (options & DO_BREAK_LINES) != 0;//int    len43   = len * 4 / 3;//byte[] outBuff = new byte[   ( len43 )                      // Main 4:3//                           + ( (len % 3) > 0 ? 4 : 0 )      // Account for padding//                           + (breakLines ? ( len43 / MAX_LINE_LENGTH ) : 0) ]; // New lines// Try to determine more precisely how big the array needs to be.// If we get it right, we don't have to do an array copy, and// we save a bunch of memory.int encLen = ( len / 3 ) * 4 + ( len % 3 > 0 ? 4 : 0 ); // Bytes needed for actual encodingif( breakLines ){encLen += encLen / MAX_LINE_LENGTH; // Plus extra newline characters}byte[] outBuff = new byte[ encLen ];int d = 0;int e = 0;int len2 = len - 2;int lineLength = 0;for( ; d < len2; d+=3, e+=4 ) {encode3to4( source, d+off, 3, outBuff, e, options );lineLength += 4;if( breakLines && lineLength >= MAX_LINE_LENGTH ){outBuff[e+4] = NEW_LINE;e++;lineLength = 0;}   // end if: end of line}   // en dfor: each piece of arrayif( d < len ) {encode3to4( source, d+off, len - d, outBuff, e, options );e += 4;}   // end if: some padding needed// Only resize array if we didn't guess it right.if( e <= outBuff.length - 1 ){// If breaking lines and the last byte falls right at// the line length (76 bytes per line), there will be// one extra byte, and the array will need to be resized.// Not too bad of an estimate on array size, I'd say.byte[] finalOut = new byte[e];System.arraycopy(outBuff,0, finalOut,0,e);//System.err.println("Having to resize array from " + outBuff.length + " to " + e );return finalOut;} else {//System.err.println("No need to resize array.");return outBuff;}}   // end else: don't compress}   // end encodeBytesToBytes/* ********  D E C O D I N G   M E T H O D S  ******** *//*** Decodes four bytes from array <var>source</var>* and writes the resulting bytes (up to three of them)* to <var>destination</var>.* The source and destination arrays can be manipulated* anywhere along their length by specifying * <var>srcOffset</var> and <var>destOffset</var>.* This method does not check to make sure your arrays* are large enough to accomodate <var>srcOffset</var> + 4 for* the <var>source</var> array or <var>destOffset</var> + 3 for* the <var>destination</var> array.* This method returns the actual number of bytes that * were converted from the Base64 encoding.* <p>This is the lowest level of the decoding methods with* all possible parameters.</p>* ** @param source the array to convert* @param srcOffset the index where conversion begins* @param destination the array to hold the conversion* @param destOffset the index where output will be put* @param options alphabet type is pulled from this (standard, url-safe, ordered)* @return the number of decoded bytes converted* @throws NullPointerException if source or destination arrays are null* @throws IllegalArgumentException if srcOffset or destOffset are invalid*         or there is not enough room in the array.* @since 1.3*/private static int decode4to3( byte[] source, int srcOffset, byte[] destination, int destOffset, int options ) {// Lots of error checking and exception throwingif( source == null ){throw new NullPointerException( "Source array was null." );}   // end ifif( destination == null ){throw new NullPointerException( "Destination array was null." );}   // end ifif( srcOffset < 0 || srcOffset + 3 >= source.length ){throw new IllegalArgumentException( String.format("Source array with length %d cannot have offset of %d and still process four bytes.", source.length, srcOffset ) );}   // end ifif( destOffset < 0 || destOffset +2 >= destination.length ){throw new IllegalArgumentException( String.format("Destination array with length %d cannot have offset of %d and still store three bytes.", destination.length, destOffset ) );}   // end ifbyte[] DECODABET = getDecodabet( options ); // Example: Dk==if( source[ srcOffset + 2] == EQUALS_SIGN ) {// Two ways to do the same thing. Don't know which way I like best.//int outBuff =   ( ( DECODABET[ source[ srcOffset    ] ] << 24 ) >>>  6 )//              | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 );int outBuff =   ( ( DECODABET[ source[ srcOffset    ] ] & 0xFF ) << 18 )| ( ( DECODABET[ source[ srcOffset + 1] ] & 0xFF ) << 12 );destination[ destOffset ] = (byte)( outBuff >>> 16 );return 1;}// Example: DkL=else if( source[ srcOffset + 3 ] == EQUALS_SIGN ) {// Two ways to do the same thing. Don't know which way I like best.//int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] << 24 ) >>>  6 )//              | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )//              | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 );int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] & 0xFF ) << 18 )| ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 )| ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) <<  6 );destination[ destOffset     ] = (byte)( outBuff >>> 16 );destination[ destOffset + 1 ] = (byte)( outBuff >>>  8 );return 2;}// Example: DkLEelse {// Two ways to do the same thing. Don't know which way I like best.//int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] << 24 ) >>>  6 )//              | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )//              | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 )//              | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 );int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] & 0xFF ) << 18 )| ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 )| ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) <<  6)| ( ( DECODABET[ source[ srcOffset + 3 ] ] & 0xFF )      );destination[ destOffset     ] = (byte)( outBuff >> 16 );destination[ destOffset + 1 ] = (byte)( outBuff >>  8 );destination[ destOffset + 2 ] = (byte)( outBuff       );return 3;}}   // end decodeToBytes/*** Low-level access to decoding ASCII characters in* the form of a byte array. <strong>Ignores GUNZIP option, if* it's set.</strong> This is not generally a recommended method,* although it is used internally as part of the decoding process.* Special case: if len = 0, an empty array is returned. Still,* if you need more speed and reduced memory footprint (and aren't* gzipping), consider this method.** @param source The Base64 encoded data* @return decoded data* @since 2.3.1*/public static byte[] decode( byte[] source )throws java.io.IOException {byte[] decoded = null;
//        try {decoded = decode( source, 0, source.length, Base64.NO_OPTIONS );
//        } catch( java.io.IOException ex ) {
//            assert false : "IOExceptions only come from GZipping, which is turned off: " + ex.getMessage();
//        }return decoded;}/*** Low-level access to decoding ASCII characters in* the form of a byte array. <strong>Ignores GUNZIP option, if* it's set.</strong> This is not generally a recommended method,* although it is used internally as part of the decoding process.* Special case: if len = 0, an empty array is returned. Still,* if you need more speed and reduced memory footprint (and aren't* gzipping), consider this method.** @param source The Base64 encoded data* @param off    The offset of where to begin decoding* @param len    The length of characters to decode* @param options Can specify options such as alphabet type to use* @return decoded data* @throws java.io.IOException If bogus characters exist in source data* @since 1.3*/public static byte[] decode( byte[] source, int off, int len, int options )throws java.io.IOException {// Lots of error checking and exception throwingif( source == null ){throw new NullPointerException( "Cannot decode null source array." );}   // end ifif( off < 0 || off + len > source.length ){throw new IllegalArgumentException( String.format("Source array with length %d cannot have offset of %d and process %d bytes.", source.length, off, len ) );}   // end ifif( len == 0 ){return new byte[0];}else if( len < 4 ){throw new IllegalArgumentException( "Base64-encoded string must have at least four characters, but length specified was " + len );}   // end ifbyte[] DECODABET = getDecodabet( options );int    len34   = len * 3 / 4;       // Estimate on array sizebyte[] outBuff = new byte[ len34 ]; // Upper limit on size of outputint    outBuffPosn = 0;             // Keep track of where we're writingbyte[] b4        = new byte[4];     // Four byte buffer from source, eliminating white spaceint    b4Posn    = 0;               // Keep track of four byte input bufferint    i         = 0;               // Source array counterbyte   sbiDecode = 0;               // Special value from DECODABETfor( i = off; i < off+len; i++ ) {  // Loop through sourcesbiDecode = DECODABET[ source[i]&0xFF ];// White space, Equals sign, or legit Base64 character// Note the values such as -5 and -9 in the// DECODABETs at the top of the file.if( sbiDecode >= WHITE_SPACE_ENC )  {if( sbiDecode >= EQUALS_SIGN_ENC ) {b4[ b4Posn++ ] = source[i];         // Save non-whitespaceif( b4Posn > 3 ) {                  // Time to decode?outBuffPosn += decode4to3( b4, 0, outBuff, outBuffPosn, options );b4Posn = 0;// If that was the equals sign, break out of 'for' loopif( source[i] == EQUALS_SIGN ) {break;}   // end if: equals sign}   // end if: quartet built}   // end if: equals sign or better}   // end if: white space, equals sign or betterelse {// There's a bad input character in the Base64 stream.throw new java.io.IOException( String.format("Bad Base64 input character decimal %d in array position %d", ((int)source[i])&0xFF, i ) );}   // end else: }   // each input characterbyte[] out = new byte[ outBuffPosn ];System.arraycopy( outBuff, 0, out, 0, outBuffPosn ); return out;}   // end decode/*** Decodes data from Base64 notation, automatically* detecting gzip-compressed data and decompressing it.** @param s the string to decode* @return the decoded data* @throws java.io.IOException If there is a problem* @since 1.4*/public static byte[] decode( String s ) throws java.io.IOException {return decode( s, NO_OPTIONS );}/*** Decodes data from Base64 notation, automatically* detecting gzip-compressed data and decompressing it.** @param s the string to decode* @return the decoded data* @throws java.io.IOException If there is a problem* @since 1.4*/public static byte[] decode( String s, String charset ) throws java.io.IOException {return s.getBytes(charset);}/*** Decodes data from Base64 notation, automatically* detecting gzip-compressed data and decompressing it.** @param s the string to decode* @param options encode options such as URL_SAFE* @return the decoded data* @throws java.io.IOException if there is an error* @throws NullPointerException if <tt>s</tt> is null* @since 1.4*/public static byte[] decode( String s, int options ) throws java.io.IOException {if( s == null ){throw new NullPointerException( "Input string was null." );}   // end ifbyte[] bytes;try {bytes = s.getBytes( PREFERRED_ENCODING );}   // end trycatch( java.io.UnsupportedEncodingException uee ) {bytes = s.getBytes();}   // end catch//</change>// Decodebytes = decode( bytes, 0, bytes.length, options );// Check to see if it's gzip-compressed// GZIP Magic Two-Byte Number: 0x8b1f (35615)boolean dontGunzip = (options & DONT_GUNZIP) != 0;if( (bytes != null) && (bytes.length >= 4) && (!dontGunzip) ) {int head = ((int)bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00);if( java.util.zip.GZIPInputStream.GZIP_MAGIC == head )  {java.io.ByteArrayInputStream  bais = null;java.util.zip.GZIPInputStream gzis = null;java.io.ByteArrayOutputStream baos = null;byte[] buffer = new byte[2048];int    length = 0;try {baos = new java.io.ByteArrayOutputStream();bais = new java.io.ByteArrayInputStream( bytes );gzis = new java.util.zip.GZIPInputStream( bais );while( ( length = gzis.read( buffer ) ) >= 0 ) {baos.write(buffer,0,length);}   // end while: reading input// No error? Get new bytes.bytes = baos.toByteArray();}   // end trycatch( java.io.IOException e ) {e.printStackTrace();// Just return originally-decoded bytes}   // end catchfinally {try{ baos.close(); } catch( Exception e ){}try{ gzis.close(); } catch( Exception e ){}try{ bais.close(); } catch( Exception e ){}}   // end finally}   // end if: gzipped}   // end if: bytes.length >= 2return bytes;}   // end decode/*** Attempts to decode Base64 data and deserialize a Java* Object within. Returns <tt>null</tt> if there was an error.** @param encodedObject The Base64 data to decode* @return The decoded and deserialized object* @throws NullPointerException if encodedObject is null* @throws java.io.IOException if there is a general error* @throws ClassNotFoundException if the decoded object is of a*         class that cannot be found by the JVM* @since 1.5*/public static Object decodeToObject( String encodedObject )throws java.io.IOException, ClassNotFoundException {return decodeToObject(encodedObject,NO_OPTIONS,null);}/*** Attempts to decode Base64 data and deserialize a Java* Object within. Returns <tt>null</tt> if there was an error.* If <tt>loader</tt> is not null, it will be the class loader* used when deserializing.** @param encodedObject The Base64 data to decode* @param options Various parameters related to decoding* @param loader Optional class loader to use in deserializing classes.* @return The decoded and deserialized object* @throws NullPointerException if encodedObject is null* @throws java.io.IOException if there is a general error* @throws ClassNotFoundException if the decoded object is of a *         class that cannot be found by the JVM* @since 2.3.4*/public static Object decodeToObject( String encodedObject, int options, final ClassLoader loader )throws java.io.IOException, ClassNotFoundException {// Decode and gunzip if necessarybyte[] objBytes = decode( encodedObject, options );java.io.ByteArrayInputStream  bais = null;java.io.ObjectInputStream     ois  = null;Object obj = null;try {bais = new java.io.ByteArrayInputStream( objBytes );// If no custom class loader is provided, use Java's builtin OIS.if( loader == null ){ois  = new java.io.ObjectInputStream( bais );}   // end if: no loader provided// Else make a customized object input stream that uses// the provided class loader.else {ois = new java.io.ObjectInputStream(bais){@Overridepublic Class<?> resolveClass(java.io.ObjectStreamClass streamClass)throws java.io.IOException, ClassNotFoundException {Class c = Class.forName(streamClass.getName(), false, loader);if( c == null ){return super.resolveClass(streamClass);} else {return c;   // Class loader knows of this class.}   // end else: not null}   // end resolveClass};  // end ois}   // end else: no custom class loaderobj = ois.readObject();}   // end trycatch( java.io.IOException e ) {throw e;    // Catch and throw in order to execute finally{}}   // end catchcatch( ClassNotFoundException e ) {throw e;    // Catch and throw in order to execute finally{}}   // end catchfinally {try{ bais.close(); } catch( Exception e ){}try{ ois.close();  } catch( Exception e ){}}   // end finallyreturn obj;}   // end decodeObject/*** Convenience method for encoding data to a file.** <p>As of v 2.3, if there is a error,* the method will throw an java.io.IOException. <b>This is new to v2.3!</b>* In earlier versions, it just returned false, but* in retrospect that's a pretty poor way to handle it.</p>* * @param dataToEncode byte array of data to encode in base64 form* @param filename Filename for saving encoded data* @throws java.io.IOException if there is an error* @throws NullPointerException if dataToEncode is null* @since 2.1*/public static void encodeToFile( byte[] dataToEncode, String filename )throws java.io.IOException {if( dataToEncode == null ){throw new NullPointerException( "Data to encode was null." );}   // end iffOutputStream bos = null;try {bos = new OutputStream(new java.io.FileOutputStream( filename ), Base64.ENCODE );bos.write( dataToEncode );}   // end trycatch( java.io.IOException e ) {throw e; // Catch and throw to execute finally{} block}   // end catch: java.io.IOExceptionfinally {try{ bos.close(); } catch( Exception e ){}}   // end finally}   // end encodeToFile/*** Convenience method for decoding data to a file.** <p>As of v 2.3, if there is a error,* the method will throw an java.io.IOException. <b>This is new to v2.3!</b>* In earlier versions, it just returned false, but* in retrospect that's a pretty poor way to handle it.</p>* * @param dataToDecode Base64-encoded data as a string* @param filename Filename for saving decoded data* @throws java.io.IOException if there is an error* @since 2.1*/public static void decodeToFile( String dataToDecode, String filename )throws java.io.IOException {OutputStream bos = null;try{bos = new OutputStream(new java.io.FileOutputStream( filename ), Base64.DECODE );bos.write( dataToDecode.getBytes( PREFERRED_ENCODING ) );}   // end trycatch( java.io.IOException e ) {throw e; // Catch and throw to execute finally{} block}   // end catch: java.io.IOExceptionfinally {try{ bos.close(); } catch( Exception e ){}}   // end finally}   // end decodeToFile/*** Convenience method for reading a base64-encoded* file and decoding it.** <p>As of v 2.3, if there is a error,* the method will throw an java.io.IOException. <b>This is new to v2.3!</b>* In earlier versions, it just returned false, but* in retrospect that's a pretty poor way to handle it.</p>* * @param filename Filename for reading encoded data* @return decoded byte array* @throws java.io.IOException if there is an error* @since 2.1*/public static byte[] decodeFromFile( String filename )throws java.io.IOException {byte[] decodedData = null;InputStream bis = null;try{// Set up some useful variablesjava.io.File file = new java.io.File( filename );byte[] buffer = null;int length   = 0;int numBytes = 0;// Check for size of fileif( file.length() > Integer.MAX_VALUE ){throw new java.io.IOException( "File is too big for this convenience method (" + file.length() + " bytes)." );}   // end if: file too big for int indexbuffer = new byte[ (int)file.length() ];// Open a streambis = new InputStream(new java.io.BufferedInputStream( new java.io.FileInputStream( file ) ), Base64.DECODE );// Read until donewhile( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) {length += numBytes;}   // end while// Save in a variable to returndecodedData = new byte[ length ];System.arraycopy( buffer, 0, decodedData, 0, length );}   // end trycatch( java.io.IOException e ) {throw e; // Catch and release to execute finally{}}   // end catch: java.io.IOExceptionfinally {try{ bis.close(); } catch( Exception e) {}}   // end finallyreturn decodedData;}   // end decodeFromFile/*** Convenience method for reading a binary file* and base64-encoding it.** <p>As of v 2.3, if there is a error,* the method will throw an java.io.IOException. <b>This is new to v2.3!</b>* In earlier versions, it just returned false, but* in retrospect that's a pretty poor way to handle it.</p>* * @param filename Filename for reading binary data* @return base64-encoded string* @throws java.io.IOException if there is an error* @since 2.1*/public static String encodeFromFile( String filename )throws java.io.IOException {String encodedData = null;InputStream bis = null;try{// Set up some useful variablesjava.io.File file = new java.io.File( filename );byte[] buffer = new byte[ Math.max((int)(file.length() * 1.4+1),40) ]; // Need max() for math on small files (v2.2.1); Need +1 for a few corner cases (v2.3.5)int length   = 0;int numBytes = 0;// Open a streambis = new InputStream(new java.io.BufferedInputStream( new java.io.FileInputStream( file ) ), Base64.ENCODE );// Read until donewhile( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) {length += numBytes;}   // end while// Save in a variable to returnencodedData = new String( buffer, 0, length, Base64.PREFERRED_ENCODING );}   // end trycatch( java.io.IOException e ) {throw e; // Catch and release to execute finally{}}   // end catch: java.io.IOExceptionfinally {try{ bis.close(); } catch( Exception e) {}}   // end finallyreturn encodedData;}   // end encodeFromFile/*** Reads <tt>infile</tt> and encodes it to <tt>outfile</tt>.** @param infile Input file* @param outfile Output file* @throws java.io.IOException if there is an error* @since 2.2*/public static void encodeFileToFile( String infile, String outfile )throws java.io.IOException {String encoded = Base64.encodeFromFile( infile );java.io.OutputStream out = null;try{out = new java.io.BufferedOutputStream(new java.io.FileOutputStream( outfile ) );out.write( encoded.getBytes("US-ASCII") ); // Strict, 7-bit output.}   // end trycatch( java.io.IOException e ) {throw e; // Catch and release to execute finally{}}   // end catchfinally {try { out.close(); }catch( Exception ex ){}}   // end finally    }   // end encodeFileToFile/*** Reads <tt>infile</tt> and decodes it to <tt>outfile</tt>.** @param infile Input file* @param outfile Output file* @throws java.io.IOException if there is an error* @since 2.2*/public static void decodeFileToFile( String infile, String outfile )throws java.io.IOException {byte[] decoded = Base64.decodeFromFile( infile );java.io.OutputStream out = null;try{out = new java.io.BufferedOutputStream(new java.io.FileOutputStream( outfile ) );out.write( decoded );}   // end trycatch( java.io.IOException e ) {throw e; // Catch and release to execute finally{}}   // end catchfinally {try { out.close(); }catch( Exception ex ){}}   // end finally    }   // end decodeFileToFile/* ********  I N N E R   C L A S S   I N P U T S T R E A M  ******** *//*** A {@link com.jd.app.server.security.Base64.InputStream} will read data from another* <tt>java.io.InputStream</tt>, given in the constructor,* and encode/decode to/from Base64 notation on the fly.** @see com.jd.app.server.security.Base64* @since 1.3*/public static class InputStream extends java.io.FilterInputStream {private boolean encode;         // Encoding or decodingprivate int     position;       // Current position in the bufferprivate byte[]  buffer;         // Small buffer holding converted dataprivate int     bufferLength;   // Length of buffer (3 or 4)private int     numSigBytes;    // Number of meaningful bytes in the bufferprivate int     lineLength;private boolean breakLines;     // Break lines at less than 80 charactersprivate int     options;        // Record options used to create the stream.private byte[]  decodabet;      // Local copies to avoid extra method calls/*** Constructs a {@link com.jd.app.server.security.Base64.InputStream} in DECODE mode.** @param in the <tt>java.io.InputStream</tt> from which to read data.* @since 1.3*/public InputStream( java.io.InputStream in ) {this( in, DECODE );}   // end constructor/*** Constructs a {@link com.jd.app.server.security.Base64.InputStream} in* either ENCODE or DECODE mode.* <p>* Valid options:<pre>*   ENCODE or DECODE: Encode or Decode as data is read.*   DO_BREAK_LINES: break lines at 76 characters*     (only meaningful when encoding)</i>* </pre>* <p>* Example: <code>new Base64.InputStream( in, Base64.DECODE )</code>*** @param in the <tt>java.io.InputStream</tt> from which to read data.* @param options Specified options* @see com.jd.app.server.security.Base64#ENCODE* @see com.jd.app.server.security.Base64#DECODE* @see com.jd.app.server.security.Base64#DO_BREAK_LINES* @since 2.0*/public InputStream( java.io.InputStream in, int options ) {super( in );this.options      = options; // Record for laterthis.breakLines   = (options & DO_BREAK_LINES) > 0;this.encode       = (options & ENCODE) > 0;this.bufferLength = encode ? 4 : 3;this.buffer       = new byte[ bufferLength ];this.position     = -1;this.lineLength   = 0;this.decodabet    = getDecodabet(options);}   // end constructor/*** Reads enough of the input stream to convert* to/from Base64 and returns the next byte.** @return next byte* @since 1.3*/@Overridepublic int read() throws java.io.IOException  {// Do we need to get data?if( position < 0 ) {if( encode ) {byte[] b3 = new byte[3];int numBinaryBytes = 0;for( int i = 0; i < 3; i++ ) {int b = in.read();// If end of stream, b is -1.if( b >= 0 ) {b3[i] = (byte)b;numBinaryBytes++;} else {break; // out of for loop}   // end else: end of stream}   // end for: each needed input byteif( numBinaryBytes > 0 ) {encode3to4( b3, 0, numBinaryBytes, buffer, 0, options );position = 0;numSigBytes = 4;}   // end if: got dataelse {return -1;  // Must be end of stream}   // end else}   // end if: encoding// Else decodingelse {byte[] b4 = new byte[4];int i = 0;for( i = 0; i < 4; i++ ) {// Read four "meaningful" bytes:int b = 0;do{ b = in.read(); }while( b >= 0 && decodabet[ b & 0x7f ] <= WHITE_SPACE_ENC );if( b < 0 ) {break; // Reads a -1 if end of stream}   // end if: end of streamb4[i] = (byte)b;}   // end for: each needed input byteif( i == 4 ) {numSigBytes = decode4to3( b4, 0, buffer, 0, options );position = 0;}   // end if: got four characterselse if( i == 0 ){return -1;}   // end else if: also padded correctlyelse {// Must have broken out from above.throw new java.io.IOException( "Improperly padded Base64 input." );}   // end }   // end else: decode}   // end else: get data// Got data?if( position >= 0 ) {// End of relevant data?if( /*!encode &&*/ position >= numSigBytes ){return -1;}   // end if: got dataif( encode && breakLines && lineLength >= MAX_LINE_LENGTH ) {lineLength = 0;return '\n';}   // end ifelse {lineLength++;   // This isn't important when decoding// but throwing an extra "if" seems// just as wasteful.int b = buffer[ position++ ];if( position >= bufferLength ) {position = -1;}   // end if: endreturn b & 0xFF; // This is how you "cast" a byte that's// intended to be unsigned.}   // end else}   // end if: position >= 0// Else errorelse {throw new java.io.IOException( "Error in Base64 code reading stream." );}   // end else}   // end read/*** Calls {@link #read()} repeatedly until the end of stream* is reached or <var>len</var> bytes are read.* Returns number of bytes read into array or -1 if* end of stream is encountered.** @param dest array to hold values* @param off offset for array* @param len max number of bytes to read into array* @return bytes read into array or -1 if end of stream is encountered.* @since 1.3*/@Overridepublic int read( byte[] dest, int off, int len ) throws java.io.IOException {int i;int b;for( i = 0; i < len; i++ ) {b = read();if( b >= 0 ) {dest[off + i] = (byte) b;}else if( i == 0 ) {return -1;}else {break; // Out of 'for' loop} // Out of 'for' loop}   // end for: each byte readreturn i;}   // end read}   // end inner class InputStream/* ********  I N N E R   C L A S S   O U T P U T S T R E A M  ******** *//*** A {@link com.jd.app.server.security.Base64.OutputStream} will write data to another* <tt>java.io.OutputStream</tt>, given in the constructor,* and encode/decode to/from Base64 notation on the fly.** @see com.jd.app.server.security.Base64* @since 1.3*/public static class OutputStream extends java.io.FilterOutputStream {private boolean encode;private int     position;private byte[]  buffer;private int     bufferLength;private int     lineLength;private boolean breakLines;private byte[]  b4;         // Scratch used in a few placesprivate boolean suspendEncoding;private int     options;    // Record for laterprivate byte[]  decodabet;  // Local copies to avoid extra method calls/*** Constructs a {@link com.jd.app.server.security.Base64.OutputStream} in ENCODE mode.** @param out the <tt>java.io.OutputStream</tt> to which data will be written.* @since 1.3*/public OutputStream( java.io.OutputStream out ) {this( out, ENCODE );}   // end constructor/*** Constructs a {@link com.jd.app.server.security.Base64.OutputStream} in* either ENCODE or DECODE mode.* <p>* Valid options:<pre>*   ENCODE or DECODE: Encode or Decode as data is read.*   DO_BREAK_LINES: don't break lines at 76 characters*     (only meaningful when encoding)</i>* </pre>* <p>* Example: <code>new Base64.OutputStream( out, Base64.ENCODE )</code>** @param out the <tt>java.io.OutputStream</tt> to which data will be written.* @param options Specified options.* @see com.jd.app.server.security.Base64#ENCODE* @see com.jd.app.server.security.Base64#DECODE* @see com.jd.app.server.security.Base64#DO_BREAK_LINES* @since 1.3*/public OutputStream( java.io.OutputStream out, int options ) {super( out );this.breakLines   = (options & DO_BREAK_LINES) != 0;this.encode       = (options & ENCODE) != 0;this.bufferLength = encode ? 3 : 4;this.buffer       = new byte[ bufferLength ];this.position     = 0;this.lineLength   = 0;this.suspendEncoding = false;this.b4           = new byte[4];this.options      = options;this.decodabet    = getDecodabet(options);}   // end constructor/*** Writes the byte to the output stream after* converting to/from Base64 notation.* When encoding, bytes are buffered three* at a time before the output stream actually* gets a write() call.* When decoding, bytes are buffered four* at a time.** @param theByte the byte to write* @since 1.3*/@Overridepublic void write(int theByte) throws java.io.IOException {// Encoding suspended?if( suspendEncoding ) {this.out.write( theByte );return;}   // end if: supsended// Encode?if( encode ) {buffer[ position++ ] = (byte)theByte;if( position >= bufferLength ) { // Enough to encode.this.out.write( encode3to4( b4, buffer, bufferLength, options ) );lineLength += 4;if( breakLines && lineLength >= MAX_LINE_LENGTH ) {this.out.write( NEW_LINE );lineLength = 0;}   // end if: end of lineposition = 0;}   // end if: enough to output}   // end if: encoding// Else, Decodingelse {// Meaningful Base64 character?if( decodabet[ theByte & 0x7f ] > WHITE_SPACE_ENC ) {buffer[ position++ ] = (byte)theByte;if( position >= bufferLength ) { // Enough to output.int len = Base64.decode4to3( buffer, 0, b4, 0, options );out.write( b4, 0, len );position = 0;}   // end if: enough to output}   // end if: meaningful base64 characterelse if( decodabet[ theByte & 0x7f ] != WHITE_SPACE_ENC ) {throw new java.io.IOException( "Invalid character in Base64 data." );}   // end else: not white space either}   // end else: decoding}   // end write/*** Calls {@link #write(int)} repeatedly until <var>len</var> * bytes are written.** @param theBytes array from which to read bytes* @param off offset for array* @param len max number of bytes to read into array* @since 1.3*/@Overridepublic void write( byte[] theBytes, int off, int len ) throws java.io.IOException {// Encoding suspended?if( suspendEncoding ) {this.out.write( theBytes, off, len );return;}   // end if: supsendedfor( int i = 0; i < len; i++ ) {write( theBytes[ off + i ] );}   // end for: each byte written}   // end write/*** Method added by PHIL. [Thanks, PHIL. -Rob]* This pads the buffer without closing the stream.* @throws java.io.IOException  if there's an error.*/public void flushBase64() throws java.io.IOException  {if( position > 0 ) {if( encode ) {out.write( encode3to4( b4, buffer, position, options ) );position = 0;}   // end if: encodingelse {throw new java.io.IOException( "Base64 input not properly padded." );}   // end else: decoding}   // end if: buffer partially full}   // end flush/** * Flushes and closes (I think, in the superclass) the stream. ** @since 1.3*/@Overridepublic void close() throws java.io.IOException {// 1. Ensure that pending characters are writtenflushBase64();// 2. Actually close the stream// Base class both flushes and closes.super.close();buffer = null;out    = null;}   // end close/*** Suspends encoding of the stream.* May be helpful if you need to embed a piece of* base64-encoded data in a stream.** @throws java.io.IOException  if there's an error flushing* @since 1.5.1*/public void suspendEncoding() throws java.io.IOException  {flushBase64();this.suspendEncoding = true;}   // end suspendEncoding/*** Resumes encoding of the stream.* May be helpful if you need to embed a piece of* base64-encoded data in a stream.** @since 1.5.1*/public void resumeEncoding() {this.suspendEncoding = false;}   // end resumeEncoding}   // end inner class OutputStream}   // end class Base64

1.5Service层AESUtil.instance.decrypt(encryptedDataB, sessionKeyB, ivB)代码:

import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;public class AESUtil {public static final AESUtil instance = new AESUtil();public static boolean initialized = false;/*** AES解密** @param content 密文*/public byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte) {initialize();try {Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");Key sKeySpec = new SecretKeySpec(keyByte, "AES");IvParameterSpec ivspec = new IvParameterSpec(ivByte);cipher.init(Cipher.DECRYPT_MODE, sKeySpec, ivspec);byte[] result = cipher.doFinal(content);return result;} catch (Exception e) {e.printStackTrace();}return null;}public static void initialize() {if (initialized) {return;}Security.addProvider(new BouncyCastleProvider());initialized = true;}}

1.6Service层SHAUtil.SHA1(rawData + sessionKey)代码:

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;public class SHAUtil {public static String SHA1(String str) {try {MessageDigest digest = MessageDigest.getInstance("SHA-1"); //如果是SHA加密只需要将"SHA-1"改成"SHA"即可digest.update(str.getBytes());byte messageDigest[] = digest.digest();// Create Hex StringStringBuffer hexStr = new StringBuffer();// 字节数组转换为 十六进制 数for (int i = 0; i < messageDigest.length; i++) {String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);if (shaHex.length() < 2) {hexStr.append(0);}hexStr.append(shaHex);}return hexStr.toString();} catch (NoSuchAlgorithmException e) {e.printStackTrace();}return null;}}

1.7Service层WeiXinResponseUserInfoDTO代码:

import io.swagger.annotations.ApiModelProperty;
import lombok.Data;@Data
public class WeiXinResponseUserInfoDTO {@ApiModelProperty("用户的微信昵称")private String nickName;@ApiModelProperty("性别")private Integer gender;@ApiModelProperty("用户的微信头像url")private String avatarUrl;@ApiModelProperty("用户的微信小程序的openid")private String openid;@ApiModelProperty("用户的微信小程序的unionId")private String unionId;@ApiModelProperty("国家")private String country;@ApiModelProperty("省份")private String province;@ApiModelProperty("城市")private String city;}

2.第二种写法, 借助第三方工具Hutool官网, 直接上代码

2.1 与第一种写法的1.1Controller层代码一样

2.2 与第一种写法的1.2WeiXinLoginRequestVO代码一样

2.3 与第一种写法的1.3Service层代码有2处不一样

2.3.1 第40行代码变成Hutool的写法:

String signature2 = SecureUtil.sha1(rawData + sessionKey);

2.3.2第117行到120行代码变成Hutool的写法:

      byte[] encryptedDataB = cn.hutool.core.codec.Base64.decode(encryptedData);                                             // 被加密的数据byte[] sessionKeyB = cn.hutool.core.codec.Base64.decode(sessionKey);                                                  // 加密秘钥byte[] ivB = cn.hutool.core.codec.Base64.decode(iv);                                                                   // 偏移量AES aes = new AES(Mode.CBC, Padding.PKCS5Padding, sessionKeyB, ivB);byte[] resultByte = aes.decrypt(encryptedDataB);

2.4 删除1.4的代码 ,第二种写法不需要这个

2.5 删除1.5的代码, 第二种写法不需要这个

2.6 删除1.6的代码, 第二种写法不需要这个

2.7 与第一种写法的1.7Service层WeiXinResponseUserInfoDTO代码一样

PS: 如果有错误, 欢迎评论指出来, 感谢大家!

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