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微信支付已经成为生活中必不可少的付款方式，本篇文章主要介绍了Java微信支付之公众号支付、扫码支付，有需要的小伙伴可以了解一下。
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, 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
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
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"%> &