URL编码解码工具类

/******************************************************************************
* CREATETIME : 2016年7月24日下午3:31:25
******************************************************************************/
package ins.platform.utils;

import java.net.URI;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.util.BitSet;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

/**
* URL编码解码工具类
* @author ★LiuPing
* @CreateTime 2016年7月24日
*/
public class URLEncodedUtils {

private static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");
private static final String PARAMETER_SEPARATOR = "&";
private static final String NAME_VALUE_SEPARATOR = "=";

/**
   * Returns a String that is suitable for use as an <code>application/x-www-form-urlencoded</code> list of parameters in an HTTP PUT or HTTP POST.
   * @param parameters The parameters to include.
   * @param encoding The encoding to use.
   */
   public static String format(final Map<String,String> paramMap,final Charset charset) {
       final StringBuilder result = new StringBuilder();
       for(final String name:paramMap.keySet()){
           final String encodedName = encodeFormFields(name,charset);
           final String encodedValue = encodeFormFields(paramMap.get(name),charset);
           if(result.length()>0){
               result.append(PARAMETER_SEPARATOR);
           }
           result.append(encodedName);
           if(encodedValue!=null){
               result.append(NAME_VALUE_SEPARATOR);
               result.append(encodedValue);
           }
       }
       return result.toString();
   }

/**
   * Returns a list of {@link NameValuePair NameValuePairs} as built from the URI's query portion. For example, a URI of http://example.org/path/to/file?a=1&b=2&c=3 would return a list of three
   * NameValuePairs, one for a=1, one for b=2, and one for c=3.
   * <p>
   * This is typically useful while parsing an HTTP PUT.
   * @param uri uri to parse
   * @param encoding encoding to use while parsing the query
   */
   public static Map<String,String> parse(final URI uri,final Charset charset) {
       final String query = uri.getRawQuery();
       Map<String,String> result = new HashMap<String,String>();
       if(query!=null&&query.length()>0){
           Scanner scanner = new Scanner(query);
           parse(result,scanner,charset);
       }
       return result;
   }

/**
   * Decode/unescape www-url-form-encoded content.
   * @param content the content to decode, will decode '+' as space
   * @param charset the charset to use
   * @return
   */
   public static String decodeField(final String content) {
       if(content==null){
           return null;
       }
       return urldecode(content,DEFAULT_CHARSET,true);
   }

public static String encodeField(final String content) {
       if(content==null){
           return null;
       }
       return urlencode(content,DEFAULT_CHARSET,URLENCODER,true);
   }

/**
   * Unreserved characters, i.e. alphanumeric, plus: {@code _ - ! . ~ ' ( ) *}
   * <p>
   * This list is the same as the {@code unreserved} list in <a href="http://www.ietf.org/rfc/rfc2396.txt">RFC 2396</a>
   */
   private static final BitSet UNRESERVED = new BitSet(256);

/**
   * Safe characters for x-www-form-urlencoded data, as per java.net.URLEncoder and browser behaviour, i.e. alphanumeric plus {@code "-", "_", ".", "*"}
   */
   private static final BitSet URLENCODER = new BitSet(256);

static{
       // unreserved chars
       // alpha characters
       for(int i = 'a'; i<='z'; i++ ){
           UNRESERVED.set(i);
       }
       for(int i = 'A'; i<='Z'; i++ ){
           UNRESERVED.set(i);
       }
       // numeric characters
       for(int i = '0'; i<='9'; i++ ){
           UNRESERVED.set(i);
       }
       UNRESERVED.set('_'); // these are the charactes of the "mark" list
       UNRESERVED.set('-');
       UNRESERVED.set('.');
       UNRESERVED.set('*');
       URLENCODER.or(UNRESERVED); // skip remaining unreserved characters
       UNRESERVED.set('!');
       UNRESERVED.set('~');
       UNRESERVED.set('\'');
       UNRESERVED.set('(');
       UNRESERVED.set(')');

}

private static final int RADIX = 16;

/**
   * Adds all parameters within the Scanner to the list of <code>parameters</code>, as encoded by <code>encoding</code>. For example, a scanner containing the string <code>a=1&b=2&c=3</code> would
   * add the {@link NameValuePair NameValuePairs} a=1, b=2, and c=3 to the list of parameters.
   * @param parameters List to add parameters to.
   * @param scanner Input that contains the parameters to parse.
   * @param charset Encoding to use when decoding the parameters.
   */
   private static void parse(final Map<String,String> parameters,final Scanner scanner,final Charset charset) {
       scanner.useDelimiter(PARAMETER_SEPARATOR);
       while(scanner.hasNext()){
           String name = null;
           String value = null;
           String token = scanner.next();
           int i = token.indexOf(NAME_VALUE_SEPARATOR);
           if(i!= -1){
               name = decodeFormFields(token.substring(0,i).trim(),charset);
               value = decodeFormFields(token.substring(i+1).trim(),charset);
           }else{
               name = decodeFormFields(token.trim(),charset);
           }
           parameters.put(name,value);
       }
   }

/**
   * Emcode/escape a portion of a URL, to use with the query part ensure {@code plusAsBlank} is true.
   * @param content the portion to decode
   * @param charset the charset to use
   * @param blankAsPlus if {@code true}, then convert space to '+' (e.g. for www-url-form-encoded content), otherwise leave as is.
   * @return
   */
   private static String urlencode(final String content,final Charset charset,final BitSet safechars,final boolean blankAsPlus) {
       if(content==null){
           return null;
       }
       StringBuilder buf = new StringBuilder();
       ByteBuffer bb = charset.encode(content);
       while(bb.hasRemaining()){
           int b = bb.get()&0xff;
           if(safechars.get(b)){
               buf.append((char)b);
           }else if(blankAsPlus&&b==' '){
               buf.append('+');
           }else{
               buf.append("%");
               char hex1 = Character.toUpperCase(Character.forDigit(( b>>4 )&0xF,RADIX));
               char hex2 = Character.toUpperCase(Character.forDigit(b&0xF,RADIX));
               buf.append(hex1);
               buf.append(hex2);
           }
       }
       return buf.toString();
   }

/**
   * Decode/unescape a portion of a URL, to use with the query part ensure {@code plusAsBlank} is true.
   * @param content the portion to decode
   * @param charset the charset to use
   * @param plusAsBlank if {@code true}, then convert '+' to space (e.g. for www-url-form-encoded content), otherwise leave as is.
   * @return
   */
   private static String urldecode(final String content,final Charset charset,final boolean plusAsBlank) {
       if(content==null){
           return null;
       }
       ByteBuffer bb = ByteBuffer.allocate(content.length());
       CharBuffer cb = CharBuffer.wrap(content);
       while(cb.hasRemaining()){
           char c = cb.get();
           if(c=='%'&&cb.remaining()>=2){
               char uc = cb.get();
               char lc = cb.get();
               int u = Character.digit(uc,16);
               int l = Character.digit(lc,16);
               if(u!= -1&&l!= -1){
                   bb.put((byte)( ( u<<4 )+l ));
               }else{
                   bb.put((byte)'%');
                   bb.put((byte)uc);
                   bb.put((byte)lc);
               }
           }else if(plusAsBlank&&c=='+'){
               bb.put((byte)' ');
           }else{
               bb.put((byte)c);
           }
       }
       bb.flip();
       return charset.decode(bb).toString();
   }

/**
   * Decode/unescape www-url-form-encoded content.
   * @param content the content to decode, will decode '+' as space
   * @param charset the charset to use
   * @return
   */
   private static String decodeFormFields(final String content,final Charset charset) {
       if(content==null){
           return null;
       }
       return urldecode(content,charset!=null ? charset : DEFAULT_CHARSET,true);
   }

/**
   * Encode/escape www-url-form-encoded content.
   * <p>
   * Uses the {@link #URLENCODER} set of characters, rather than the {@link #UNRSERVED} set; this is for compatibilty with previous releases, URLEncoder.encode() and most browsers.
   * @param content the content to encode, will convert space to '+'
   * @param charset the charset to use
   * @return
   */
   private static String encodeFormFields(final String content,final Charset charset) {
       if(content==null){
           return null;
       }
       return urlencode(content,charset!=null ? charset : DEFAULT_CHARSET,URLENCODER,true);
   }

}

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