java服务端微信APP支付接口详解

一、微信APP支付接入商户服务中心

[申请流程指引] (https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419317780&token=84f23b4e9746c5963128711f225476cfd49ccf8c&lang=zh_CN)

二、开始开发

1、配置相关的配置信息

1.1、配置appid（Android）、mch_id（ios）、微信支付后的回调地址

sys.properties配置文件:

  appid=wx***************1
  mch_id=1********2
  notify_url=http://6*.***.***.**/returnmsg.do 

//回调通知的地址,一定是要可以直接访问的地址

2、微信支付–下单

@ResponseBody
@RequestMapping(value = "/weixinpay.do", produces = "text/html;charset=UTF-8",method={RequestMethod.POST})
  public static String weixinpay(String body, //商品描述
      String detail, //商品详情
      String attach, //附加数据，在查询API和支付通知中原样返回，该字段主要用于商户携带订单的自定义数据
      String out_trade_no, //商户系统内部的订单号,32个字符内、可包含字母, 其他说明见商户订单号
      String total_price, //订单总金额，单位为分，详见支付金额
      String spbill_create_ip //用户端实际ip

      ) throws Exception { 

    WeixinConfigUtils config = new WeixinConfigUtils();
    //参数组
    String appid = config.appid;//微信开放平台审核通过的应用APPID
    System.out.println("appid是："+appid);
    String mch_id = config.mch_id;
    System.out.println("mch_id是："+mch_id);
    String nonce_str = RandCharsUtils.getRandomString(16);
    System.out.println("随机字符串是："+nonce_str);


    body = body;//"测试微信支付0.01_2";
    detail = detail;//"0.01_元测试开始";
    //attach = attach;//"备用参数，先留着，后面会有用的";
    //String out_trade_no = OrderUtil.getOrderNo();//"2015112500001000811017342394";

    double totalfee =0;
    try{
      totalfee=Double.parseDouble(total_price);////单位是分，即是0.01元
    }catch (Exception e) {
      totalfee=0;
    }
    int total_fee=(int) (totalfee*100);
    spbill_create_ip = spbill_create_ip;//"127.0.0.1";

    String time_start = RandCharsUtils.timeStart();
    System.out.println(time_start);
    String time_expire = RandCharsUtils.timeExpire();
    System.out.println(time_expire);
    String notify_url = config.notify_url;
    System.out.println("notify_url是："+notify_url);
    String trade_type = "APP";

    //参数：开始生成签名
    SortedMap parameters = new TreeMap();
    parameters.put("appid", appid);
    parameters.put("mch_id", mch_id);
    parameters.put("nonce_str", nonce_str);
    parameters.put("body", body);
    //parameters.put("nonce_str", nonce_str);
    parameters.put("detail", detail);
    parameters.put("attach", attach);
    parameters.put("out_trade_no", out_trade_no);
    parameters.put("total_fee", total_fee);
    parameters.put("time_start", time_start);
    parameters.put("time_expire", time_expire);
    parameters.put("notify_url", notify_url);
    parameters.put("trade_type", trade_type);
    parameters.put("spbill_create_ip", spbill_create_ip);

    String sign = WXSignUtils.createSign("UTF-8", parameters);
    System.out.println("签名是："+sign);


    Unifiedorder unifiedorder = new Unifiedorder();
    unifiedorder.setAppid(appid);
    unifiedorder.setMch_id(mch_id);
    unifiedorder.setNonce_str(nonce_str);
    unifiedorder.setSign(sign);
    unifiedorder.setBody(body);
    unifiedorder.setDetail(detail);
    unifiedorder.setAttach(attach);
    unifiedorder.setOut_trade_no(out_trade_no);
    unifiedorder.setTotal_fee(total_fee);
    unifiedorder.setSpbill_create_ip(spbill_create_ip);
    unifiedorder.setTime_start(time_start);
    unifiedorder.setTime_expire(time_expire);
    unifiedorder.setNotify_url(notify_url);
    unifiedorder.setTrade_type(trade_type);

    System.out.println(MD5Utils.md5("fenxiangzhuyi") + "========================");

    //构造xml参数
    String xmlInfo = HttpXmlUtils.xmlInfo(unifiedorder);

    String wxUrl = "https://api.mch.weixin.qq.com/pay/unifiedorder";

    String method = "POST";

    String weixinPost = HttpXmlUtils.httpsRequest(wxUrl, method, xmlInfo).toString();

    System.out.println(weixinPost);

    ParseXMLUtils.jdomParseXml(weixinPost);



    String json = JsonUtil.xml2jsonString(weixinPost);

    System.out.println("=========================================================");

    Bean b = JsonUtil.getSingleBean(json, Bean.class);
    if(null!=b){
      WeixinOrder weixin = b.getXml();
      //参数：开始生成签名
      SortedMap par = new TreeMap();
      par.put("appid", weixin.getAppid());
      par.put("partnerid", weixin.getMch_id());
      par.put("prepayid", weixin.getPrepay_id());
      par.put("package", "Sign=WXPay");
      par.put("noncestr", weixin.getNonce_str());

      //时间戳
Date date = new Date();
long time = date.getTime();
//mysq 时间戳只有10位 要做处理
String dateline = time + "";
dateline = dateline.substring(0, 10);

      par.put("timestamp", dateline);

      String signnew = WXSignUtils.createSign("UTF-8", par);
      System.out.println("再次签名是："+signnew);


      SetPay setPay = new SetPay();

      setPay.setAppid(weixin.getAppid());
      setPay.setPartnerid(weixin.getMch_id());
      setPay.setPrepayid(weixin.getPrepay_id());
      setPay.setNoncestr(weixin.getNonce_str());

      setPay.setTimestamp(dateline);
      setPay.setSign(signnew);
      setPay.setPack("Sign=WXPay");

      JSonObject js = JSONObject.fromObject(setPay);
      StringBuilder msg = new StringBuilder();
      msg.append("{"code":"1",");
      msg.append(""msg":"查询成功！",");
      msg.append(""datas":");
      msg.append(js.toString());
      msg.append("}");

      System.out.println(js);

      return msg.toString();
    }
    StringBuilder msg = new StringBuilder();
    msg.append("{"code":"1",");
    msg.append(""msg":"查询成功！",");
    msg.append(""datas":");
    msg.append("支付失败！");
    msg.append("}");


    return msg.toString();

  }

2.1、微信支付签名算法sign

package com.wx.weixincontroller.pay.weixin.Utils;

import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;

import com.wx.weixin.utils.MD5Utils;


public class WXSignUtils {
  //http://mch.weixin.qq.com/wiki/doc/api/index.php?chapter=4_3
  //商户Key：改成公司申请的即可
  //32位密码设置地址：http://www.sexauth.com/ jdex1hvufnm1sdcb0e81t36k0d0f15nc

  private static String Key = "***cb**e**ef**c*e*d***e*fd***cb*";

  
  @SuppressWarnings("rawtypes")
  public static String createSign(String characterEncoding,SortedMap parameters){


    StringBuffer sb = new StringBuffer();
    Set es = parameters.entrySet();//所有参与传参的参数按照accsii排序（升序）
    Iterator it = es.iterator();
    while(it.hasNext()) {
      Map.Entry entry = (Map.Entry)it.next();
      String k = (String)entry.getKey();
      Object v = entry.getValue();
      if(null != v && !"".equals(v) 
   && !"sign".equals(k) && !"key".equals(k)) {
 sb.append(k + "=" + v + "&");
      }
    }
    sb.append("key=" + Key);
    System.out.println("字符串拼接后是："+sb.toString());
    String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
    return sign;
  }

}

2.2、POST提交XML格式的参数

package com.wx.weixincontroller.pay.weixin.Utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;

import com. com.wx.weixin.wxcontroller.pay.weixin.entity.Unifiedorder;


public class HttpXmlUtils {

  
  public static String xmlHttpProxy(String url,String xml,String method,String contentType){
    InputStream is = null;
    OutputStreamWriter os = null;

    try {
      URL _url = new URL(url);
      HttpURLConnection conn = (HttpURLConnection) _url.openConnection();
      conn.setDoInput(true);  
      conn.setDoOutput(true);  
      conn.setRequestProperty("Content-type", "text/xml");
      conn.setRequestProperty("Pragma:", "no-cache"); 
      conn.setRequestProperty("Cache-Control", "no-cache"); 
      conn.setRequestMethod("POST");
      os = new OutputStreamWriter(conn.getOutputStream());
      os.write(new String(xml.getBytes(contentType)));
      os.flush();

      //返回值
      is = conn.getInputStream();
      return getContent(is, "utf-8");
    } catch (MalformedURLException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    } finally{
      try {
 if(os!=null){os.close();}
 if(is!=null){is.close();}
      } catch (IOException e) {
 e.printStackTrace();
      }
    }
    return null;
  }

  
  public static String getContent(InputStream is, String charset) {
    String pageString = null;
    InputStreamReader isr = null;
    BufferedReader br = null;
    StringBuffer sb = null;
    try {
      isr = new InputStreamReader(is, charset);
      br = new BufferedReader(isr);
      sb = new StringBuffer();
      String line = null;
      while ((line = br.readLine()) != null) {
 sb.append(line + "n");
      }
      pageString = sb.toString();
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
 if (is != null){
   is.close();
 }
 if(isr!=null){
   isr.close();
 }
 if(br!=null){
   br.close();
 }
      } catch (IOException e) {
 e.printStackTrace();
      }
      sb = null;
    }
    return pageString;
  }

  
  public static String xmlInfo(Unifiedorder unifiedorder){
    //构造xml参数的时候，至少又是个必传参数
    

    if(unifiedorder!=null){
      StringBuffer bf = new StringBuffer();
      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");

      bf.append("");


      bf.append("");
      return bf.toString();
    }

    return "";
  }




  
  public static String httpsRequest(String requestUrl, String requestMethod, String output) {
    try{
      URL url = new URL(requestUrl);
      HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
      connection.setDoOutput(true);
      connection.setDoInput(true);
      connection.setUseCaches(false);
      connection.setRequestMethod(requestMethod);
      if (null != output) {
 OutputStream outputStream = connection.getOutputStream();
 outputStream.write(output.getBytes("UTF-8"));
 outputStream.close();
      }
      // 从输入流读取返回内容
      InputStream inputStream = connection.getInputStream();
      InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
      BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
      String str = null;
      StringBuffer buffer = new StringBuffer();
      while ((str = bufferedReader.readLine()) != null) {
 buffer.append(str);
      }
      bufferedReader.close();
      inputStreamReader.close();
      inputStream.close();
      inputStream = null;
      connection.disconnect();
      return buffer.toString();
    }catch(Exception ex){
      ex.printStackTrace();
    }

    return "";
  }

}

3、微信支付–回调通知业务处理

 //通知处理类
 @ResponseBody
 @RequestMapping(value = "/returnmsg.do", produces = "text/html;charset=UTF-8",method={RequestMethod.POST})
    public String returnmsg(HttpServletRequest request, HttpServletResponse response) throws Exception {

      // 解析结果存储在HashMap
      Map map = new HashMap();
      InputStream inputStream = request.getInputStream();

      // 读取输入流
      SAXReader reader = new SAXReader();
      document document = reader.read(inputStream);
      // 得到xml根元素
      Element root = document.getRootElement();
      // 得到根元素的所有子节点
      List elementList = root.elements();

      // 遍历所有子节点
      for (Element e : elementList) {
 map.put(e.getName(), e.getText());
      }

      JSonObject json = JSONObject.fromObject(map);

      System.out.println("===消息通知的结果：" + json.toString() + "==========================");
      System.out.println("===return_code===" + map.get("return_code"));
      System.out.println("===return_msg===" + map.get("return_msg"));
      System.out.println("===out_trade_no===" + map.get("out_trade_no"));

      //验证签名的过程

      //判断是否支付成功
      if(map.get("return_code").equals("SUCCESS")) {

   

   // 释放资源
   inputStream.close();
   inputStream = null;


   //bis.close();
   return "SUCCESS";
 }

      }
      if (map.get("return_code").equals("FAIL")) {

 

   // 释放资源
   inputStream.close();

   inputStream = null;

   return "SUCCESS";
 }


      }

      // 释放资源
      inputStream.close();
      inputStream = null;

      return "SUCCESS";

    }

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