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<Object,Object> parameters = new TreeMap<Object,Object>();
    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<Object,Object> par = new TreeMap<Object,Object>();
      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;

/**
 * 微信支付签名
 * @author iYjrg_xiebin
 * @date 2016年10月25日下午4:47:07
 */
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*";

  /**
   * 微信支付签名算法sign
   * @param characterEncoding
   * @param parameters
   * @return
   */
  @SuppressWarnings("rawtypes")
  public static String createSign(String characterEncoding,SortedMap<Object,Object> 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;

/**
 * post提交xml格式的参数
 * @author iYjrg_xiebin
 * @date 2016年10月25日下午3:33:38
 */
public class HttpXmlUtils {

  /**
   * 开始post提交参数到接口
   * 并接受返回
   * @param url
   * @param xml
   * @param method
   * @param contentType
   * @return
   */
  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;
  }

  /**
   * 解析返回的值
   * @param is
   * @param charset
   * @return
   */
  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;
  }

  /**
   * 构造xml参数
   * @param xml
   * @return
   */
  public static String xmlInfo(Unifiedorder unifiedorder){
    //构造xml参数的时候，至少又是个必传参数
    /*
     * <xml>
        <appid>wx2421b1c4370ec43b</appid>
        <attach>支付测试</attach>
        <body>JSAPI支付测试</body>
        <mch_id>10000100</mch_id>
        <nonce_str>1add1a30ac87aa2db72f57a2375d8fec</nonce_str>
        <notify_url>http://wxpay.weixin.qq.com/pub_v2/pay/notify.v2.php</notify_url>
        <openid>oUpF8uMuAJO_M2pxb1Q9zNjWeS6o</openid>
        <out_trade_no>1415659990</out_trade_no>
        <spbill_create_ip>14.23.150.211</spbill_create_ip>
        <total_fee>1</total_fee>
        <trade_type>JSAPI</trade_type>
        <sign>0CB01533B8C1EF103065174F50BCA001</sign>
      </xml>
     */

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

      bf.append("<appid><![CDATA[");
      bf.append(unifiedorder.getAppid());
      bf.append("]]></appid>");

      bf.append("<mch_id><![CDATA[");
      bf.append(unifiedorder.getMch_id());
      bf.append("]]></mch_id>");

      bf.append("<nonce_str><![CDATA[");
      bf.append(unifiedorder.getNonce_str());
      bf.append("]]></nonce_str>");

      bf.append("<sign><![CDATA[");
      bf.append(unifiedorder.getSign());
      bf.append("]]></sign>");

      bf.append("<body><![CDATA[");
      bf.append(unifiedorder.getBody());
      bf.append("]]></body>");

      bf.append("<detail><![CDATA[");
      bf.append(unifiedorder.getDetail());
      bf.append("]]></detail>");

      bf.append("<attach><![CDATA[");
      bf.append(unifiedorder.getAttach());
      bf.append("]]></attach>");

      bf.append("<out_trade_no><![CDATA[");
      bf.append(unifiedorder.getOut_trade_no());
      bf.append("]]></out_trade_no>");

      bf.append("<total_fee><![CDATA[");
      bf.append(unifiedorder.getTotal_fee());
      bf.append("]]></total_fee>");

      bf.append("<spbill_create_ip><![CDATA[");
      bf.append(unifiedorder.getSpbill_create_ip());
      bf.append("]]></spbill_create_ip>");

      bf.append("<time_start><![CDATA[");
      bf.append(unifiedorder.getTime_start());
      bf.append("]]></time_start>");

      bf.append("<time_expire><![CDATA[");
      bf.append(unifiedorder.getTime_expire());
      bf.append("]]></time_expire>");

      bf.append("<notify_url><![CDATA[");
      bf.append(unifiedorder.getNotify_url());
      bf.append("]]></notify_url>");

      bf.append("<trade_type><![CDATA[");
      bf.append(unifiedorder.getTrade_type());
      bf.append("]]></trade_type>");

      bf.append("</xml>");
      return bf.toString();
    }

    return "";
  }

  /**
   * post请求并得到返回结果
   * @param requestUrl
   * @param requestMethod
   * @param output
   * @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<String, String> map = new HashMap<String, String>();
      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<Element> 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")) {

          /**
          *支付成功之后的业务处理
          */

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

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

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

        /**
         *支付失败后的业务处理
         */

          // 释放资源
          inputStream.close();

          inputStream = null;

          return "SUCCESS";
        }

      }

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

      return "SUCCESS";

    }

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