Java微信支付之公众号支付、扫码支付实例

发布时间：2020-12-15 13:27:18 所属栏目：Java 来源：互联网

导读：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。

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

<%@ 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

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,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

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,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

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

 <%@ 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,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>

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