Java WeChat payment official account payment and scan code payment examples-WeChat Development-php.cn

WeChat payment has become more and more popular now, and many products have emerged with the gimmick of being able to quickly access WeChat payment. However, the convenience also makes us rely on third parties to make things, and we lose The ability to think independently, this time I plan to share the WeChat payment I have developed before.

1. H5 public account payment

Key points: Correctly obtain openId and unified ordering interface, correctly handle payment result notifications, correctly configure the payment authorization directory

H5 payment method It is a more widely used method. This payment method is mainly used for web pages with custom menus in WeChat. It relies on the WeChat client installed on the mobile phone. Only higher versions of WeChat support WeChat payment. Please follow my process and pay attention to the instructions below

1 Write a page for payment. Since it is for testing, it is simpler to write.

<%@ 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>

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2 Write a servlet to get the code through Oauth

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); 
 } 
  
}

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3 After getting the code , obtain the openId through REDIRECTURI, and call the unified ordering interface

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); 
 } 
  
}

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When calling the WeChat unified ordering interface, you need to pay attention to the signature algorithm. Only when the signature is calculated correctly can payment be made smoothly

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; 
 }

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4 Write the final payment interface Call up WeChat H5 payment

<%@ 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( 
   &#39;getBrandWCPayRequest&#39;,<%=(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(&#39;WeixinJSBridgeReady&#39;, jsApiCall, false); 
   }else if (document.attachEvent){ 
    document.attachEvent(&#39;WeixinJSBridgeReady&#39;, jsApiCall); 
    document.attachEvent(&#39;onWeixinJSBridgeReady&#39;, jsApiCall); 
   } 
  }else{ 
   jsApiCall(); 
  } 
 } 
 </script> 
 </head> 
  
 <body> 
  <input type="button" value="支付" onclick="callpay()"/> 
 </body> 
</html>

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5 Process WeChat payment result notification

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 
     
  } 
 } 
  
}

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For the above code, many refer to http://blog.csdn.net/u011160656/article/details /41759195, so this part of the code will not be posted. If you need it, just read this blog.

2 WeChat scan code payment (Mode 1)

Key points: The long link to short link interface must be called, and the scan code payment callback URL must be correctly configured

1 According to Generate WeChat payment QR code from order number

The following are several methods to generate QR code:

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); 
  } 
 } 
  
 }

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This is considered a tool, and the other one is to display the QR code on the interface Method, CreateQRCode mainly uses code blocks:

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(); 
  
  
}

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2 Convert a long link to a short link to generate a QR code, write a scan code payment callback method and call the unified order interface

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; 
 } 
  
}

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Finally take a look at the public WeChat configuration for account payment and scan code payment:

Java WeChat payment official account payment and scan code payment examples

I hope that through this article, everyone can understand that even if you use Java to make WeChat official accounts and WeChat payments, With the help of those deceptive codes provided by github, you can also develop WeChat applications that satisfy yourself and your customers. Although the demos provided by WeChat are all in PHP, these are just clouds, and the development language is second. Understanding the underlying layers required for interface calls is only a required course for programmers.

For more articles related to Java WeChat payment official account payment and scan code payment examples, please pay attention to the PHP Chinese website!