170327、Java微信支付中的扫码支付

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
1. <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
2. <%
3. String path = request.getContextPath();
4. String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
5. %>
7. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
8. <html>
9. <head>
10. <base href="<%=basePath%>">
12. <title>微信支付样例</title>
14. <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
15. 
19. </head>
21. <body>
22. <form action="oauthServlet" method="POST">
23. 订单号：<input type="text" name="orderNo" />
24. <input type="submit" value="H5支付"/>
25. </form>
26. </br></br>
27. <form action="scanCodePayServlet?flag=createCode" method="POST">
28. 订单号：<input type="text" name="orderNo" />
29. <input type="submit" value="扫码支付"/>
30. </form>
31. </body>
32. </html>
2 编写一个servlet用于通过Oauth获取code

[java] view plain co
1. package com.debug.weixin.servlet;
3. import java.io.IOException;
4. import java.io.PrintWriter;
6. import javax.servlet.RequestDispatcher;
7. import javax.servlet.ServletException;
8. import javax.servlet.http.HttpServlet;
9. import javax.servlet.http.HttpServletRequest;
10. import javax.servlet.http.HttpServletResponse;
12. import com.debug.weixin.util.CommonUtil;
13. import com.debug.weixin.util.ServerConfig;
15. public class OauthServlet extends HttpServlet {
18. public void doGet(HttpServletRequest request, HttpServletResponse response)
19. throws ServletException, IOException {
21. this.doPost(request, response);
22. }
24. public void doPost(HttpServletRequest request, HttpServletResponse response)
25. throws ServletException, IOException {
27. String orderNo=request.getParameter("orderNo");
28. //调用微信Oauth2.0获取openid
29. String redirectURL=ServerConfig.SERVERDOMAIN+"/BasicWeixin/payServletForH5?orderNo="+orderNo;
30. String redirectURI="";
31. try {
32. redirectURI=CommonUtil.initOpenId(redirectURL);
33. } catch (Exception e) {
34. // TODO Auto-generated catch block
35. e.printStackTrace();
36. }
37. //System.out.println(redirectURI);
38. //RequestDispatcher dis= request.getRequestDispatcher(redirectURI);
39. //dis.forward(request, response);
40. response.sendRedirect(redirectURI);
41. }
43. }
3 获取到code后，通过REDIRECTURI获取openId,调用统一下单接口

[java] view plain cop
1. package com.debug.weixin.servlet;
3. import java.io.IOException;
4. import java.io.PrintWriter;
5. import java.util.SortedMap;
6. import java.util.TreeMap;
8. import javax.servlet.RequestDispatcher;
9. import javax.servlet.ServletException;
10. import javax.servlet.http.HttpServlet;
11. import javax.servlet.http.HttpServletRequest;
12. import javax.servlet.http.HttpServletResponse;
14. import com.debug.weixin.pojo.WeixinOauth2Token;
15. import com.debug.weixin.pojo.WeixinQRCode;
16. import com.debug.weixin.util.AdvancedUtil;
17. import com.debug.weixin.util.CommonUtil;
18. import com.debug.weixin.util.ConfigUtil;
19. import com.debug.weixin.util.PayCommonUtil;
21. public class PayServletForH5 extends HttpServlet {
24. public void doGet(HttpServletRequest request, HttpServletResponse response)
25. throws ServletException, IOException {
27. this.doPost(request, response);
28. }
30. public void doPost(HttpServletRequest request, HttpServletResponse response)
31. throws ServletException, IOException {
32. String orderNo=request.getParameter("orderNo");
33. String code=request.getParameter("code");
35. //获取AccessToken
37. WeixinOauth2Token token=AdvancedUtil.getOauth2AccessToken(ConfigUtil.APPID, ConfigUtil.APP_SECRECT, code);
39. String openId=token.getOpenId();
41. //调用微信统一支付接口
42. SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
43. parameters.put("appid", ConfigUtil.APPID);
45. parameters.put("mch_id", ConfigUtil.MCH_ID);
46. parameters.put("device_info", "1000");
47. parameters.put("body", "我的测试订单");
48. parameters.put("nonce_str", PayCommonUtil.CreateNoncestr());
51. parameters.put("out_trade_no", orderNo);
52. //parameters.put("total_fee", String.valueOf(total));
53. parameters.put("total_fee", "1");
54. parameters.put("spbill_create_ip", request.getRemoteAddr());
55. parameters.put("notify_url", ConfigUtil.NOTIFY_URL);
56. parameters.put("trade_type", "JSAPI");
57. parameters.put("openid", openId);
59. String sign = PayCommonUtil.createSign("UTF-8", parameters);
60. parameters.put("sign", sign);
62. String requestXML = PayCommonUtil.getRequestXml(parameters);
64. String result = CommonUtil.httpsRequestForStr(ConfigUtil.UNIFIED_ORDER_URL,"POST", requestXML);
65. System.out.println("----------------------------------");
66. System.out.println(result);
67. System.out.println("----------------------------------");
69. request.setAttribute("orderNo", orderNo);
70. request.setAttribute("totalPrice", "0.01");
71. String payJSON="";
72. try {
73. payJSON=CommonUtil.getH5PayStr(result,request);
75. } catch (Exception e) {
76. // TODO Auto-generated catch block
77. e.printStackTrace();
78. }
79. //System.out.println(payJSON);
80. request.setAttribute("unifiedOrder",payJSON);
82. RequestDispatcher dis= request.getRequestDispatcher("h5Pay.jsp");
83. dis.forward(request, response);
84. }
86. }
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：
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原文地址：https://www.cnblogs.com/zrbfree/p/6709012.html