微信app支付 java后台接Android

抽时间整理一下之前项目中的微信app支付，以备以后需要，如果对你可以有点帮助是最好不过的；

直接上代码：

public class WeChatAppConfig {/*** 预支付请求地址*/public static final String  PrepayUrl = "https://api.mch.weixin.qq.com/pay/unifiedorder";/*** 查询订单地址*/public static final String  OrderUrl = "https://api.mch.weixin.qq.com/pay/orderquery";/*** 关闭订单地址*/public static final String  CloseOrderUrl = "https://api.mch.weixin.qq.com/pay/closeorder";/*** 申请退款地址*/public static final String  RefundUrl = "https://api.mch.weixin.qq.com/secapi/pay/refund";/*** 查询退款地址*/public static final String  RefundQueryUrl = "https://api.mch.weixin.qq.com/pay/refundquery";/*** 下载账单地址*/public static final String  DownloadBillUrl = "https://api.mch.weixin.qq.com/pay/downloadbill";/*** 商户APPID*/public static final String  AppId = "此处是商户appid";/*** 商户账户 获取支付能力后，从邮件中得到*/public static final String  MchId = "此处是mchid";/*** 商户秘钥  32位，在微信商户平台中设置 api安全下的设置密钥(不是开放平台 )  注意！！！ 注意！！！！*/public static final String  AppSercret = "此处是商户密钥";/*** sign type*/public static final String  Sign = "MD5";/*** 服务器异步通知页面路径*/public static String notify_url = "http://catering.saimark.xusage.com/catering/a/****** （为后台url）";/*** 页面跳转同步通知页面路径*/public static String return_url = "此处为后台url";/*** 退款通知地址*/public static String refund_notify_url = "此处为后台url";/*** 退款需要证书文件，证书文件的地址*/public static String refund_file_path = "此处为后台url";/*** 商品名称*/public static String subject =  "subject（自己按需要更改，也可以传值进入）";/*** 商品描述*/public static String body = "微信支付（自己按需要更改，也可以传值进入）";/*   private static  Properties properties;public static synchronized Properties getProperties(){if(properties == null){String path = System.getenv(RSystemConfig.KEY_WEB_HOME_CONF) + "/weichart.properties";properties = PropertiesUtil.getInstance().getProperties(path);}return properties;
*/}

HttpClientUtil：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.security.KeyStore;
import java.util.Map;import javax.net.ssl.SSLContext;import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.StringRequestEntity;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLContexts;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;public class HttpClientUtil {public static String post(String url, Map<String, String> headMap, Map<String, String> params) {try {HttpClient httpclient = new HttpClient();httpclient.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "UTF-8");PostMethod httpPost = new PostMethod(url);if (null != headMap) {for (String key : headMap.keySet()) {httpPost.setRequestHeader(key, headMap.get(key));}}if (null != params) {for (String pkey : params.keySet()) {httpPost.addParameter(pkey, params.get(pkey));}}httpclient.executeMethod(httpPost);BufferedReader reader = new BufferedReader(new InputStreamReader(httpPost.getResponseBodyAsStream()));StringBuffer stringBuffer = new StringBuffer();String str = "";while ((str = reader.readLine()) != null) {stringBuffer.append(str);}reader.close();return stringBuffer.toString();} catch (Exception e) {e.printStackTrace();}return null;}public static String postHttplient(String url, String xmlInfo) {try {HttpClient httpclient = new HttpClient();httpclient.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "UTF-8");PostMethod httpPost = new PostMethod(url);httpPost.setRequestEntity(new StringRequestEntity(xmlInfo));httpclient.executeMethod(httpPost);BufferedReader reader = new BufferedReader(new InputStreamReader(httpPost.getResponseBodyAsStream()));StringBuffer stringBuffer = new StringBuffer();String str = "";while ((str = reader.readLine()) != null) {stringBuffer.append(str);}reader.close();return stringBuffer.toString();} catch (Exception e) {e.printStackTrace();}return null;}/*** 需要加密执行的* * @param url* @param xmlInfo* @return* @throws Exception*/public static String postHttplientNeedSSL(String url, String xmlInfo, String cretPath, String mrchId)throws Exception {// 选择初始化密钥文件格式KeyStore keyStore = KeyStore.getInstance("PKCS12");// 得到密钥文件流FileInputStream instream = new FileInputStream(new File(cretPath));try {// 用商户的ID 来解读文件keyStore.load(instream, mrchId.toCharArray());} finally {instream.close();}// 用商户的ID 来加载SSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(keyStore, mrchId.toCharArray()).build();// Allow TLSv1 protocol onlySSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext, new String[] { "TLSv1" }, null,SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);// 用最新的httpclient 加载密钥CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();StringBuffer ret = new StringBuffer();try {HttpPost httpPost = new HttpPost(url);httpPost.setEntity(new StringEntity(xmlInfo));CloseableHttpResponse response = httpclient.execute(httpPost);try {HttpEntity entity = response.getEntity();if (entity != null) {BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(entity.getContent()));String text;while ((text = bufferedReader.readLine()) != null) {ret.append(text);}}EntityUtils.consume(entity);} finally {response.close();}} finally {httpclient.close();}return ret.toString();}public static String postHtpps(String urlStr, String xmlInfo) {try {URL url = new URL(urlStr);URLConnection con = url.openConnection();con.setDoOutput(true);//con.setRequestProperty("Pragma:", "no-cache");con.setRequestProperty("Cache-Control", "no-cache");con.setRequestProperty("Content-Type", "text/xml;charset=utf-8");OutputStreamWriter out = new OutputStreamWriter(con.getOutputStream(), "utf-8");out.write(xmlInfo);out.flush();out.close();BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream()));StringBuffer lines = new StringBuffer();String line = "";for (line = br.readLine(); line != null; line = br.readLine()) {lines.append(line);}return lines.toString();} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return null;}}

WeiMd5：

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;public class WeiMd5 {// 全局数组private final static String[] strDigits = { "0", "1", "2", "3", "4", "5","6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };// 返回形式为数字跟字符串private static String byteToArrayString(byte bByte) {int iRet = bByte;// System.out.println("iRet="+iRet);if (iRet < 0) {iRet += 256;}int iD1 = iRet / 16;int iD2 = iRet % 16;return strDigits[iD1] + strDigits[iD2];}// 转换字节数组为16进制字串private static String byteToString(byte[] bByte) {StringBuffer sBuffer = new StringBuffer();for (int i = 0; i < bByte.length; i++) {sBuffer.append(byteToArrayString(bByte[i]));}return sBuffer.toString();}public static String encode(String strObj) {String resultString = null;try {resultString = new String(strObj);MessageDigest md = MessageDigest.getInstance("MD5");// md.digest() 该函数返回值为存放哈希值结果的byte数组try{resultString = byteToString(md.digest(strObj.getBytes("UTF-8")));}catch(UnsupportedEncodingException e){// TODO Auto-generated catch blocke.printStackTrace();}} catch (NoSuchAlgorithmException ex) {ex.printStackTrace();}return resultString;}}

WeiChartUtil：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;import javax.servlet.http.HttpServletRequest;import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;import xusage.xcharge.support.xentity.RechargeUpdateFromWechatAppNotify;public class WeiChartUtil {/*** 返回状态码*/public static final String ReturnCode = "return_code";/*** 返回信息*/public static final String ReturnMsg = "return_msg";/*** 业务结果*/public static final String ResultCode = "result_code";/*** 预支付交易会话标识*/public static final String PrepayId = "prepay_id";/*** 得到微信预付单的返回ID* @param orderId  商户自己的订单号* @param totalFee  总金额  （分）* @return*/public static Map<String, String> getPreyId(String orderId,String totalFee,String schoolLabel){Map<String, String> reqMap = new HashMap<String, String>();reqMap.put("appid", WeChatAppConfig.AppId);reqMap.put("mch_id", WeChatAppConfig.MchId);reqMap.put("nonce_str", getRandomString());reqMap.put("body", schoolLabel+"_"+ WeChatAppConfig.body);//reqMap.put("detail", WeChatAppConfig.subject); //非必填//reqMap.put("attach", "附加数据"); //非必填reqMap.put("out_trade_no", orderId); //商户系统内部的订单号,reqMap.put("total_fee", changeToFen(Double.valueOf(totalFee))); //订单总金额，单位为分reqMap.put("spbill_create_ip", getHostIp()); //用户端实际ipDate date = new Date();//reqMap.put("time_start", String.valueOf(date.getTime()/1000)); //交易起始时间 非必填// reqMap.put("time_expire", "172.16.40.18"); //交易结束时间  非必填// reqMap.put("goods_tag", "172.16.40.18"); //商品标记 非必填reqMap.put("notify_url", WeChatAppConfig.notify_url); //通知地址reqMap.put("trade_type", "APP"); //交易类型//reqMap.put("limit_pay", "no_credit"); //指定支付方式,no_credit 指定不能使用信用卡支  非必填reqMap.put("sign", getSign(reqMap));String reqStr = creatXml(reqMap);String retStr = HttpClientUtil.postHtpps(WeChatAppConfig.PrepayUrl, reqStr);return getInfoByXml(retStr);}/*** 关闭订单* @param orderId  商户自己的订单号* @return*/public static Map<String, String> closeOrder(String orderId){Map<String, String> reqMap = new HashMap<String, String>();reqMap.put("appid", WeChatAppConfig.AppId);reqMap.put("mch_id", WeChatAppConfig.MchId);reqMap.put("nonce_str", getRandomString());reqMap.put("out_trade_no", orderId); //商户系统内部的订单号,reqMap.put("sign", getSign(reqMap));String reqStr = creatXml(reqMap);String retStr = HttpClientUtil.postHtpps(WeChatAppConfig.CloseOrderUrl, reqStr);return getInfoByXml(retStr);}/*** 查询订单* @param orderId 商户自己的订单号* @return*/public static Map<String, String> getOrder(String orderId){Map<String, String> reqMap = new HashMap<String, String>();reqMap.put("appid", WeChatAppConfig.AppId);reqMap.put("mch_id", WeChatAppConfig.MchId);reqMap.put("nonce_str", getRandomString());reqMap.put("out_trade_no", orderId); //商户系统内部的订单号,reqMap.put("sign", getSign(reqMap));String reqStr = creatXml(reqMap);String retStr = HttpClientUtil.postHtpps(WeChatAppConfig.OrderUrl, reqStr);//return retStr;return getInfoByXml(retStr);}/*** 退款* @param orderId  商户订单号* @param refundId  退款单号* @param totralFee 总金额（分）* @param refundFee 退款金额（分）* @param opUserId 操作员ID* @return*/public static Map<String, String> refundWei(String orderId,String refundId,String totralFee,String refundFee,String opUserId){Map<String, String> reqMap = new HashMap<String, String>();reqMap.put("appid", WeChatAppConfig.AppId);reqMap.put("mch_id", WeChatAppConfig.MchId);reqMap.put("nonce_str", getRandomString());reqMap.put("out_trade_no", orderId); //商户系统内部的订单号,reqMap.put("out_refund_no", refundId); //商户退款单号reqMap.put("total_fee", totralFee); //总金额reqMap.put("refund_fee", refundFee); //退款金额reqMap.put("op_user_id", opUserId); //操作员reqMap.put("sign", getSign(reqMap));String reqStr = creatXml(reqMap);String retStr = "";try{retStr = HttpClientUtil.postHttplientNeedSSL(WeChatAppConfig.RefundUrl, reqStr, WeChatAppConfig.refund_file_path, WeChatAppConfig.MchId);}catch(Exception e){e.printStackTrace();return null;}return getInfoByXml(retStr);}/*** 退款查询* @param refundId  退款单号* @return*/public static Map<String, String> getRefundWeiInfo(String refundId){Map<String, String> reqMap = new HashMap<String, String>();reqMap.put("appid", WeChatAppConfig.AppId);reqMap.put("mch_id", WeChatAppConfig.MchId);reqMap.put("nonce_str", getRandomString());reqMap.put("out_refund_no", refundId); //商户退款单号reqMap.put("sign", getSign(reqMap));String reqStr = creatXml(reqMap);String retStr = HttpClientUtil.postHtpps(WeChatAppConfig.RefundQueryUrl, reqStr);return getInfoByXml(retStr);}/**这个方法 可以自己写，以前我使用的是我公司封装的类，后来很多人找我要JAR包，所以我改成了这样，方便部分人直接使用代码，我自己未测试，不过应该问题不大，欢迎使用有问题的找我。* 传入map  生成头为XML的xml字符串，例：<xml><key>123</key></xml>* @param reqMap* @return*/public static String creatXml(Map<String, String> reqMap){Set<String> set = reqMap.keySet();StringBuffer b = new StringBuffer();b.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");b.append("<xml>");for(String key : set){b.append("<"+key+">").append(reqMap.get(key)).append("</"+key+">");}b.append("</xml>");return b.toString();}/*** 得到加密值* @param map* @return*/public static String getSign(Map<String, String> map){String[] keys = map.keySet().toArray(new String[0]);Arrays.sort(keys);StringBuffer reqStr = new StringBuffer();for(String key : keys){String v = map.get(key);if(v != null && !v.equals("")){reqStr.append(key).append("=").append(v).append("&");}}reqStr.append("key").append("=").append(WeChatAppConfig.AppSercret);return WeiMd5.encode(reqStr.toString()).toUpperCase();}/*** 得到10 位的时间戳* 如果在JAVA上转换为时间要在后面补上三个0 * @return*/public static String getTenTimes(){String t = new Date().getTime()+"";t = t.substring(0, t.length()-3);return t;}/*** 得到随机字符串* @param length* @return*/public static String getRandomString(){int length = 32;String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";Random random = new Random();StringBuffer sb = new StringBuffer();for(int i = 0; i < length; ++i){int number = random.nextInt(62);//[0,62)  sb.append(str.charAt(number));}return sb.toString();}/*** 得到本地机器的IP* @return*/private static String getHostIp(){String ip = "";try{ip = InetAddress.getLocalHost().getHostAddress();}catch(UnknownHostException e){e.printStackTrace();}return ip;}/*** 将xml解析成map* @param xmlStr* @return*/public static Map<String, String> getInfoByXml(String xmlStr){try{Map<String, String> m = new HashMap<String, String>();Document d = DocumentHelper.parseText(xmlStr);Element root = d.getRootElement();for ( Iterator<?> i = root.elementIterator(); i.hasNext(); ) {Element element = (Element) i.next();String name = element.getName();if(!element.isTextOnly()){//不是字符串 跳过。确定了微信放回的xml只有根目录continue;}else{m.put(name, element.getTextTrim());}}//对返回结果做校验.去除sign 字段再去加密String retSign = m.get("sign");m.remove("sign");String rightSing = getSign(m);if(rightSing.equals(retSign)){m.put("sign", retSign);return m;}}catch(DocumentException e){e.printStackTrace();}return null;}/*** 将金额转换成分* @param fee 元格式的* @return 分*/public static String changeToFen(Double fee){String priceStr = "";if(fee != null){int p = (int)(fee * 100); //价格变为分priceStr = Integer.toString(p);}return priceStr;}/*** 接收微信的异步通知* * @throws IOException*/public static String reciverWx(HttpServletRequest request) throws IOException{InputStream inputStream;StringBuffer sb = new StringBuffer();inputStream = request.getInputStream();String s;BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));while ((s = in.readLine()) != null){sb.append(s);}in.close();inputStream.close();return sb.toString();}/*** 验证回调签名* @return*//* public static boolean isTenpaySign(Map<String, String> map) {String signFromAPIResponse = map.get("sign");if (signFromAPIResponse == null || signFromAPIResponse.equals("")) {LOGGER.error("API返回的数据签名数据不存在，有可能被第三方篡改!!!");return false;}LOGGER.info("服务器回包里面的签名是:" + signFromAPIResponse);//将API返回的数据根据用签名算法进行计算新的签名，用来跟API返回的签名进行比较//算出签名String resultSign = "";map.remove("sign");String tobesign = getSign(map);try{resultSign = WeiMd5.encode(tobesign).toUpperCase();}catch (Exception e) {resultSign = WeiMd5.encode(tobesign).toUpperCase();}LOGGER.info("微信回调；再次验证签名正确与否生成的签名：{}", resultSign);String tenpaySign = signFromAPIResponse.toUpperCase();return tenpaySign.equals(resultSign);} */private static final org.slf4j.Logger LOGGER = org.slf4j.LoggerFactory.getLogger(WeiChartUtil.class);}

至此，如果配置好config数据后不出意外就可以得到prepayid了；

Android端需要的数据为： appid partnerid prepayid noncestr package timestamp；

这时有几个地方需要注意：

1. 获取prepayid后返回给Android端的是需要二次签名的；也就是说再次获取通过WeiChartUtil.getSign（）获取签名，传入只包含这6个参数的map（也要注意这6个参数名的大小写，微信端定义好的）；

2.package 现在默认值为 “Sign=WXPay” ；

3.timestamp 为十位的时间戳，自己做下处理，去掉后三位即可；不过看到有说timestamp和noncestr在Android端可以那边自己做；反正我是一并处理返回过去了；

好了；后台支付的接口至此结束，接下来就是Android端的对接了；

接下来是支付完成后，微信会请求事先再WeChatAppConfig中配置好的回调url；

这里我就只放处理的代码了：

         String sb = WeiChartUtil.reciverWx(request);//解析xml成map  Map<String, String> xmlMap = new HashMap<String, String>();  xmlMap = WeiChartUtil.getInfoByXml(sb);  //此方法里已经验证过是否是微信返回的签名//判断签名是否正确  if(xmlMap != null) {  //------------------------------  //处理业务开始  //------------------------------  String resXml = "";  if("SUCCESS".equals((String)xmlMap.get("result_code"))){  // 这里是支付成功  //执行自己的业务逻辑  String mch_id = (String)xmlMap.get("mch_id");  String openid = (String)xmlMap.get("openid");  String is_subscribe = (String)xmlMap.get("is_subscribe");  String out_trade_no = (String)xmlMap.get("out_trade_no");    //这个就是我们内部传给微信的订单号String total_fee = (String)xmlMap.get("total_fee");  LOGGER.info("is_subscribe:{}, out_trade_no: {}, total_fee: {},mch_id: {}, openid: {}",is_subscribe,out_trade_no,total_fee,mch_id,openid);  //执行自己的业务逻辑  LOGGER.info("支付成功");  //通知微信.异步确认成功.必写.不然会一直通知后台.九次之后就认为交易失败了.  通知频率为15/15/30/180/1800/1800/1800/1800/3600 resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"  + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";  result.setResXml("SUCCESS");} else {  result.setResXml("FAIL");LOGGER.info("支付失败,错误信息：" + xmlMap.get("err_code"));  resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"  + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";  }  //------------------------------  //处理业务完毕  //------------------------------  BufferedOutputStream out = new BufferedOutputStream(  response.getOutputStream());  out.write(resXml.getBytes());out.flush();  out.close();  } else{  result.setResXml("FAIL");LOGGER.info("通知签名验证失败");  }

再接收到回调时候，最好是要对签名做下再次认证的，因为我图方便，将再次认证就放在getInfoByXml（）方法里的，这个是可以直接拿来用的，如果觉得想分离出来手动处理下吧，再WeiChatUtils中最下边也有现成的注释掉的方法；

如果项目需要做单笔交易查询再次认证；调用相应的方法即可；传入自己数据库中订单的id去查询（out_trade_no：商户系统内部的订单号）

好啦；微信app支付到此结束；希望对你能有帮助

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