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Java微信支付之公众号支付、扫码支付实例

时间:2020-06-30 11:19     来源/作者:青蛙小王子

微信支付现在已经变得越来越流行了,随之也出现了很多以可以快速接入微信支付为噱头的产品,不过方便之余也使得我们做东西慢慢依赖第三方,丧失了独立思考的能力,这次打算分享下我之前开发过的微信支付。

一 、H5公众号支付

要点:正确获取openId以及统一下单接口,正确处理支付结果通知,正确配置支付授权目录

H5的支付方式是使用较为广泛的方式,这种支付方式主要用于微信内自定义菜单的网页,依赖手机上安装的微信客户端,高版本的微信才支持微信支付,下面按我的流程注意说明

1  编写用于支付的页面,由于是测试用就写的简单了点

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
 <base href="<%=basePath%>">
  
 <title>微信支付样例</title>
  
 <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
 <!--
 <link rel="stylesheet" type="text/css" href="styles.css">
 -->
 
 </head>
 
 <body>
 <form action="oauthServlet" method="POST">
    订单号:<input type="text" name="orderNo" />
  <input type="submit" value="H5支付"/>
 </form>
 </br></br>
  <form action="scanCodePayServlet?flag=createCode" method="POST">
    订单号:<input type="text" name="orderNo" />
  <input type="submit" value="扫码支付"/>
 </form>
 </body>
</html>

2  编写一个servlet用于通过Oauth获取code

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package com.debug.weixin.servlet;
 
import java.io.IOException;
import java.io.PrintWriter;
 
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import com.debug.weixin.util.CommonUtil;
import com.debug.weixin.util.ServerConfig;
 
public class OauthServlet extends HttpServlet {
 
  
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
 
  this.doPost(request, response);
 }
 
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
 
   String orderNo=request.getParameter("orderNo");
   //调用微信Oauth2.0获取openid
   String redirectURL=ServerConfig.SERVERDOMAIN+"/BasicWeixin/payServletForH5?orderNo="+orderNo;
   String redirectURI="";
   try {
    redirectURI=CommonUtil.initOpenId(redirectURL);
   } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   }
   //System.out.println(redirectURI);
   //RequestDispatcher dis= request.getRequestDispatcher(redirectURI);
   //dis.forward(request, response);
   response.sendRedirect(redirectURI);
 }
 
}

3 获取到code后,通过REDIRECTURI获取openId,调用统一下单接口

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package com.debug.weixin.servlet;
 
import java.io.IOException;
import java.io.PrintWriter;
import java.util.SortedMap;
import java.util.TreeMap;
 
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import com.debug.weixin.pojo.WeixinOauth2Token;
import com.debug.weixin.pojo.WeixinQRCode;
import com.debug.weixin.util.AdvancedUtil;
import com.debug.weixin.util.CommonUtil;
import com.debug.weixin.util.ConfigUtil;
import com.debug.weixin.util.PayCommonUtil;
 
public class PayServletForH5 extends HttpServlet {
 
  
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
 
  this.doPost(request, response);
 }
 
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
   String orderNo=request.getParameter("orderNo");
   String code=request.getParameter("code");
   
   //获取AccessToken
   
   WeixinOauth2Token token=AdvancedUtil.getOauth2AccessToken(ConfigUtil.APPID, ConfigUtil.APP_SECRECT, code);
   
   String openId=token.getOpenId();
   
   //调用微信统一支付接口
   SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
  parameters.put("appid", ConfigUtil.APPID);
 
  parameters.put("mch_id", ConfigUtil.MCH_ID);
  parameters.put("device_info", "1000");
  parameters.put("body", "我的测试订单");
  parameters.put("nonce_str", PayCommonUtil.CreateNoncestr());
   
    
  parameters.put("out_trade_no", orderNo);
  //parameters.put("total_fee", String.valueOf(total));
  parameters.put("total_fee", "1");
  parameters.put("spbill_create_ip", request.getRemoteAddr());
  parameters.put("notify_url", ConfigUtil.NOTIFY_URL);
  parameters.put("trade_type", "JSAPI");
  parameters.put("openid", openId);
 
  String sign = PayCommonUtil.createSign("UTF-8", parameters);
  parameters.put("sign", sign);
 
  String requestXML = PayCommonUtil.getRequestXml(parameters);
 
  String result = CommonUtil.httpsRequestForStr(ConfigUtil.UNIFIED_ORDER_URL,"POST", requestXML);
  System.out.println("----------------------------------");
  System.out.println(result);
  System.out.println("----------------------------------");
   
  request.setAttribute("orderNo", orderNo);
  request.setAttribute("totalPrice", "0.01");
  String payJSON="";
  try {
   payJSON=CommonUtil.getH5PayStr(result,request);
    
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  //System.out.println(payJSON);
  request.setAttribute("unifiedOrder",payJSON);
   
  RequestDispatcher dis= request.getRequestDispatcher("h5Pay.jsp");
  dis.forward(request, response);
 }
 
}

调用微信统一下单接口,需要注意签名算法,只有签名计算正确才能顺利支付

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public static String getH5PayStr(String result,HttpServletRequest request) throws Exception{
   
   Map<String, String> map = XMLUtil.doXMLParse(result);
    
    
    SortedMap<Object,Object> params = new TreeMap<Object,Object>();
   params.put("appId", ConfigUtil.APPID);
   params.put("timeStamp", Long.toString(new Date().getTime()));
   params.put("nonceStr", PayCommonUtil.CreateNoncestr());
   params.put("package", "prepay_id="+map.get("prepay_id"));
   params.put("signType", ConfigUtil.SIGN_TYPE);
   String paySign = PayCommonUtil.createSign("UTF-8", params);
   
   params.put("paySign", paySign);  //paySign的生成规则和Sign的生成规则一致
   
   String json = JSONObject.fromObject(params).toString();
   
   return json;
 }

 4 编写最终的支付界面调起微信H5支付

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
 <base href="<%=basePath%>">
  
 <title>微信H5支付</title>
  
 <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
  <script type="text/javascript">
  
 function jsApiCall(){
  WeixinJSBridge.invoke(
   'getBrandWCPayRequest',<%=(String)request.getAttribute("unifiedOrder")%>, function(res){
    WeixinJSBridge.log(res.err_msg);
    //alert(res.err_code+res.err_desc+res.err_msg);
    if(res.err_msg == "get_brand_wcpay_request:ok" ) {
     alert("恭喜你,支付成功!");
    }else{
     alert(res.err_code+res.err_desc+res.err_msg);    
    }
   }
  );
 }
 
 function callpay(){
  if (typeof WeixinJSBridge == "undefined"){
   if( document.addEventListener ){
    document.addEventListener('WeixinJSBridgeReady', jsApiCall, false);
   }else if (document.attachEvent){
    document.attachEvent('WeixinJSBridgeReady', jsApiCall);
    document.attachEvent('onWeixinJSBridgeReady', jsApiCall);
   }
  }else{
   jsApiCall();
  }
 }
 </script>
 </head>
 
 <body>
  <input type="button" value="支付" onclick="callpay()"/>
 </body>
</html>

5 处理微信支付结果通知

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package com.debug.weixin.servlet;
 
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Map;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.jdom.JDOMException;
 
import com.debug.weixin.util.PayCommonUtil;
import com.debug.weixin.util.XMLUtil;
 
public class PayHandlerServlet extends HttpServlet {
 
  
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
   this.doPost(request, response);
 }
 
  
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
 
  InputStream inStream = request.getInputStream();
  ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
  byte[] buffer = new byte[1024];
  int len = 0;
  while ((len = inStream.read(buffer)) != -1) {
   outSteam.write(buffer, 0, len);
  }
   
  outSteam.close();
  inStream.close();
  String result = new String(outSteam.toByteArray(),"utf-8");//获取微信调用我们notify_url的返回信息
  Map<Object, Object> map=null;
  try {
   map = XMLUtil.doXMLParse(result);
  } catch (JDOMException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  for(Object keyValue : map.keySet()){
   System.out.println(keyValue+"="+map.get(keyValue));
  }
  if (map.get("result_code").toString().equalsIgnoreCase("SUCCESS")) {
    
   //对订单进行业务操作
   System.out.println("-------------OK");
   response.getWriter().write(PayCommonUtil.setXML("SUCCESS", "")); //告诉微信服务器,我收到信息了,不要在调用回调action了
    
  }
 }
 
}

对于上面的代码,有很多都是参考http://blog.csdn.net/u011160656/article/details/41759195,因此这部分的代码就不贴出来了,需要的话看这个博客就知道了。

二  微信扫码支付(模式一)

要点:必须调用长链接转短链接接口、正确配置扫码支付回调URL

1 根据订单号生成微信支付二维码

下面是几个生成二维码的方法:

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package com.debug.weixin.util;
import com.google.zxing.common.BitMatrix;
 
 import javax.imageio.ImageIO;
 import java.io.File;
 import java.io.OutputStream;
 import java.io.IOException;
 import java.awt.image.BufferedImage;
 
 
 public final class MatrixToImageWriter {
 
 private static final int BLACK = 0xFF000000;
 private static final int WHITE = 0xFFFFFFFF;
 
 private MatrixToImageWriter() {}
 
  
 public static BufferedImage toBufferedImage(BitMatrix matrix) {
  int width = matrix.getWidth();
  int height = matrix.getHeight();
  BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
  for (int x = 0; x < width; x++) {
  for (int y = 0; y < height; y++) {
   image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
  }
  }
  return image;
 }
 
  
 public static void writeToFile(BitMatrix matrix, String format, File file)
  throws IOException {
  BufferedImage image = toBufferedImage(matrix);
  if (!ImageIO.write(image, format, file)) {
  throw new IOException("Could not write an image of format " + format + " to " + file);
  }
 }
 
  
 public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)
  throws IOException {
  BufferedImage image = toBufferedImage(matrix);
  if (!ImageIO.write(image, format, stream)) {
  throw new IOException("Could not write an image of format " + format);
  }
 }
 
 }

 这个算是工具类,还有一个就是把二维码显示在界面上的方法,CreateQRCode主要用到代码块:

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public static void createCodeStream(String text,HttpServletResponse response) throws Exception{
 
 // response.setContentType("image/jpeg");
 ServletOutputStream sos = response.getOutputStream();
 
 int width = 500;
 int height = 500;
 //二维码的图片格式
 String format = "jpg";
 MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
 Map hints = new HashMap();
 //内容所使用编码
 hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
 BitMatrix bitMatrix = multiFormatWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);
 
 
 //生成二维码
 
 MatrixToImageWriter.writeToStream(bitMatrix, format,sos);
 
 sos.close();
 
 
}

2 长链接转短链接生成二维码,编写扫码支付回调方法并调用统一下单接口

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package com.debug.weixin.servlet;
 
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Date;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.jdom.JDOMException;
 
import com.debug.weixin.util.CommonUtil;
import com.debug.weixin.util.ConfigUtil;
import com.debug.weixin.util.CreateQRCode;
import com.debug.weixin.util.PayCommonUtil;
import com.debug.weixin.util.XMLUtil;
import com.mongodb.DBObject;
 
public class ScanCodePayServlet extends HttpServlet {
 
  
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  this.doPost(request, response);
   
 }
 
  
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
   
  String flag=request.getParameter("flag");
  if("createCode".equals(flag)){
   createPayCode(request,response);
  }else{
   try {
    wxScanCodeHandler(request,response);
   } catch (Exception e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
   
   
 }
  
 public void createPayCode(HttpServletRequest request,HttpServletResponse response){
   
  String orderNo=request.getParameter("orderNo");
   
  SortedMap<Object,Object> paras = new TreeMap<Object,Object>();
  paras.put("appid", ConfigUtil.APPID);
  paras.put("mch_id", ConfigUtil.MCH_ID);
  paras.put("time_stamp", Long.toString(new Date().getTime()));
  paras.put("nonce_str", PayCommonUtil.CreateNoncestr());
  paras.put("product_id", orderNo);//商品号要唯一
  String sign = PayCommonUtil.createSign("UTF-8", paras);
  paras.put("sign", sign);
   
  String url = "weixin://wxpay/bizpayurl?sign=SIGN&appid=APPID&mch_id=MCHID&product_id=PRODUCTID&time_stamp=TIMESTAMP&nonce_str=NOCESTR";
  String nativeUrl = url.replace("SIGN", sign).replace("APPID", ConfigUtil.APPID).replace("MCHID", ConfigUtil.MCH_ID).replace("PRODUCTID", (String)paras.get("product_id")).replace("TIMESTAMP", (String)paras.get("time_stamp")).replace("NOCESTR", (String)paras.get("nonce_str"));
   
 
 
   SortedMap<Object,Object> parameters = new TreeMap<Object,Object>();
   parameters.put("appid", ConfigUtil.APPID);
   parameters.put("mch_id", ConfigUtil.MCH_ID);
   parameters.put("nonce_str", PayCommonUtil.CreateNoncestr());
   parameters.put("long_url", CommonUtil.urlEncodeUTF8(nativeUrl));
   String sign2 = PayCommonUtil.createSign("UTF-8", parameters);
   parameters.put("sign", sign2);
   String requestXML = PayCommonUtil.getRequestXml(parameters);
   String result =CommonUtil.httpsRequestForStr(ConfigUtil.SHORT_URL, "POST", requestXML);
   
   Map<String, String> map=null;
  try {
   map = XMLUtil.doXMLParse(result);
  } catch (JDOMException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
   String returnCode = map.get("return_code");
   String resultCode = map.get("result_code");
   
   if(returnCode.equalsIgnoreCase("SUCCESS")&&resultCode.equalsIgnoreCase("SUCCESS")){
    
    String shortUrl = map.get("short_url");
    //TODO 拿到shortUrl,写代码生成二维码
    System.out.println("shortUrl="+shortUrl);
    try {
    CreateQRCode.createCodeStream(shortUrl,response);
    } catch (Exception e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    }
  }
 }
  
  
 public void wxScanCodeHandler(HttpServletRequest request,HttpServletResponse response) throws Exception {
  InputStream inStream = request.getInputStream();
  ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
  byte[] buffer = new byte[1024];
  int len = 0;
  while ((len = inStream.read(buffer)) != -1) {
   outSteam.write(buffer, 0, len);
  }
   
  outSteam.close();
  inStream.close();
  String result = new String(outSteam.toByteArray(),"utf-8");//获取微信调用我们notify_url的返回信息
  Map<Object, Object> map=null;
  try {
   map = XMLUtil.doXMLParse(result);
  } catch (JDOMException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  for(Object keyValue : map.keySet()){
   System.out.println(keyValue+"="+map.get(keyValue));
  }
  String orderNo=map.get("product_id").toString();
   
  //接收到请求参数后调用统一下单接口
  SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
  parameters.put("appid", ConfigUtil.APPID);
 
  parameters.put("mch_id", ConfigUtil.MCH_ID);
  parameters.put("device_info", "1000");
  parameters.put("body", "测试扫码支付订单");
  parameters.put("nonce_str", PayCommonUtil.CreateNoncestr());
   
    
  parameters.put("out_trade_no", map.get("product_id"));
  //parameters.put("total_fee", String.valueOf(totalPrice));
  parameters.put("total_fee", "1");
  parameters.put("spbill_create_ip", request.getRemoteAddr());
  parameters.put("notify_url", ConfigUtil.NOTIFY_URL);
  parameters.put("trade_type", "NATIVE");
  parameters.put("openid", map.get("openid"));
 
  String sign = PayCommonUtil.createSign("UTF-8", parameters);
  
  parameters.put("sign", sign);
 
  String requestXML = PayCommonUtil.getRequestXml(parameters);
 
  String result2 = CommonUtil.httpsRequestForStr(ConfigUtil.UNIFIED_ORDER_URL,"POST", requestXML);
   
  System.out.println("-----------------------------统一下单结果---------------------------");
  System.out.println(result2);
  Map<String, String> mm=null;
  try {
   mm=getH5PayMap(result2,request);
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  //String prepayId=getPrepayId(result2,request);
  //String returnNoneStr=getReturnNoneStr(result2,request);
  String prepayId=mm.get("prepay_id");
  String returnNoneStr=mm.get("nonce_str");;
  SortedMap<Object, Object> lastSign = new TreeMap<Object, Object>();
  lastSign.put("return_code", "SUCCESS");
  lastSign.put("appid", ConfigUtil.APPID);
  lastSign.put("mch_id", ConfigUtil.MCH_ID);
  lastSign.put("nonce_str", returnNoneStr);
  lastSign.put("prepay_id", prepayId);
  lastSign.put("result_code", "SUCCESS");
  lastSign.put("key", ConfigUtil.API_KEY);
   
   
  String lastSignpara = PayCommonUtil.createSign("UTF-8", lastSign);
   
   
  StringBuffer buf=new StringBuffer();
  buf.append("<xml>");
  buf.append("<return_code>SUCCESS</return_code>");
  buf.append("<appid>"+ConfigUtil.APPID+"</appid>");
  buf.append("<mch_id>"+ConfigUtil.MCH_ID+"</mch_id>");
  buf.append("<nonce_str>"+returnNoneStr+"</nonce_str>");
  buf.append("<prepay_id>"+prepayId+"</prepay_id>");
  buf.append("<result_code>SUCCESS</result_code>");
  buf.append("<sign>"+lastSignpara+"</sign>");
  buf.append("</xml>");
   
  response.getWriter().print(buf.toString());
 }
  
 public Map<String, String> getH5PayMap(String result,HttpServletRequest request) throws Exception{
   
   Map<String, String> map = XMLUtil.doXMLParse(result);
   return map;
 }
 
}

最终看下公众号支付和扫码支付的微信配置:

Java微信支付之公众号支付、扫码支付实例

Java微信支付之公众号支付、扫码支付实例

 

希望通过这篇文章,大家能明白就算通过Java来做微信公众号、微信支付而不借助github提供的那些坑人的代码也可以开发出另自己和客户满意的微信应用。虽然微信给出的demo都是PHP的,但这些都是浮云,开发语言是其次,理解接口调用需具备的底层只是才是程序员的必修课。

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