170327、Java微信支付中的扫码支付
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
[html] view plain copy
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
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<%
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String path = request.getContextPath();
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String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
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%>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<base href="<%=basePath%>">
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<title>微信支付样例</title>
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
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<!--
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<link rel="stylesheet" type="text/css" href="styles.css">
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-->
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</head>
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<body>
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<form action="oauthServlet" method="POST">
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订单号：<input type="text" name="orderNo" />
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<input type="submit" value="H5支付"/>
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</form>
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</br></br>
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<form action="scanCodePayServlet?flag=createCode" method="POST">
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订单号：<input type="text" name="orderNo" />
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<input type="submit" value="扫码支付"/>
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</form>
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</body>
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</html>
2 编写一个servlet用于通过Oauth获取code
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package com.debug.weixin.servlet;
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import java.io.IOException;
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import java.io.PrintWriter;
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import javax.servlet.RequestDispatcher;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import com.debug.weixin.util.CommonUtil;
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import com.debug.weixin.util.ServerConfig;
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public class OauthServlet extends HttpServlet {
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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this.doPost(request, response);
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}
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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String orderNo=request.getParameter("orderNo");
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//调用微信Oauth2.0获取openid
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String redirectURL=ServerConfig.SERVERDOMAIN+"/BasicWeixin/payServletForH5?orderNo="+orderNo;
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String redirectURI="";
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try {
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redirectURI=CommonUtil.initOpenId(redirectURL);
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} catch (Exception e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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//System.out.println(redirectURI);
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//RequestDispatcher dis= request.getRequestDispatcher(redirectURI);
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//dis.forward(request, response);
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response.sendRedirect(redirectURI);
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}
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}
3 获取到code后，通过REDIRECTURI获取openId,调用统一下单接口
[java] view plain cop
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package com.debug.weixin.servlet;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.util.SortedMap;
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import java.util.TreeMap;
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import javax.servlet.RequestDispatcher;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import com.debug.weixin.pojo.WeixinOauth2Token;
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import com.debug.weixin.pojo.WeixinQRCode;
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import com.debug.weixin.util.AdvancedUtil;
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import com.debug.weixin.util.CommonUtil;
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import com.debug.weixin.util.ConfigUtil;
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import com.debug.weixin.util.PayCommonUtil;
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public class PayServletForH5 extends HttpServlet {
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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this.doPost(request, response);
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}
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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String orderNo=request.getParameter("orderNo");
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String code=request.getParameter("code");
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//获取AccessToken
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WeixinOauth2Token token=AdvancedUtil.getOauth2AccessToken(ConfigUtil.APPID, ConfigUtil.APP_SECRECT, code);
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String openId=token.getOpenId();
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//调用微信统一支付接口
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SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
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parameters.put("appid", ConfigUtil.APPID);
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parameters.put("mch_id", ConfigUtil.MCH_ID);
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parameters.put("device_info", "1000");
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parameters.put("body", "我的测试订单");
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parameters.put("nonce_str", PayCommonUtil.CreateNoncestr());
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parameters.put("out_trade_no", orderNo);
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//parameters.put("total_fee", String.valueOf(total));
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parameters.put("total_fee", "1");
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parameters.put("spbill_create_ip", request.getRemoteAddr());
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parameters.put("notify_url", ConfigUtil.NOTIFY_URL);
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parameters.put("trade_type", "JSAPI");
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parameters.put("openid", openId);
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String sign = PayCommonUtil.createSign("UTF-8", parameters);
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parameters.put("sign", sign);
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String requestXML = PayCommonUtil.getRequestXml(parameters);
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String result = CommonUtil.httpsRequestForStr(ConfigUtil.UNIFIED_ORDER_URL,"POST", requestXML);
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System.out.println("----------------------------------");
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System.out.println(result);
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System.out.println("----------------------------------");
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request.setAttribute("orderNo", orderNo);
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request.setAttribute("totalPrice", "0.01");
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String payJSON="";
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try {
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payJSON=CommonUtil.getH5PayStr(result,request);
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} catch (Exception e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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//System.out.println(payJSON);
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request.setAttribute("unifiedOrder",payJSON);
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RequestDispatcher dis= request.getRequestDispatcher("h5Pay.jsp");
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dis.forward(request, response);
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}
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}
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
最终看下公众号支付和扫码支付的微信配置：
