java微信公众号JSAPI支付以及所遇到的坑
作者：互联网
上周做了个支付宝微信扫码支付，今天总结一下。微信相比支付宝要麻烦许多
由于涉及到代理商，没办法，让我写个详细的申请流程，懵逼啊。
笔记地址 http://note.youdao.com/noteshare?id=269ddffb1f95e69eafb281d054f9ff25&sub=82AACBC2E6814133938D407BD3FF4737
先梳理下流程，对应的文档
微信统一下单 H5页面调起微信支付 官方javademo
要实现微信支付需要四个参数(需要企业认证，就不说了)
商户平台 商户号ID，也就是商户号。 KEY，也就是API秘钥。 公众平台 AppID AppSecret
梳理完之后，开始操作吧
第一步：参数准备和环境配置
上面的四大参数只有商户key相对比较麻烦
商户平台
公众平台
四大参数准备齐以及环境配置好开始第二步了。
第二步：开发流程
参考开发流程
必须的参数有
appid APPID （已有） mch_id 商户ID （已有） nonce_str 随机字符串 sign 签名 body 所支付的名称 out_trade_no 咱们自己所提供的订单号,需要唯一 total_fee 支付金额spbill_create_ip IP地址 notify_url 回调地址 trade_type 支付类型 openid 支付人的微信公众号对应的唯一标识
官方就是官方，看着就是费劲，大白话听着多爽
陈海洋：
需要codeid，文档地址 https://qydev.weixin.qq.com/wiki/index.php?title=OAuth%E9%AA%8C%E8%AF%81%E6%8E%A5%E5%8F%A3 。 根据codeid来获取openid 根据openid来获取prepare_id 进行下单操作。js调起微信支付
操作1，用户授权获取code
https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect
注意点 redirect_url需要经过encodeURI编码。
可以使用 js内置的函数encodeURIComponent('http://www.baidu.com')来进行编码操作
我第一反应在想，为什么需要进行url编码，因为这个redirect_uri是作为参数来传递的。
之后就会重定向到你设置的url上面，并且携带code参数，我的后台是这么接收的
ok，code获取完毕
操作2，get请求接口对返回的string进行json解析获取到openid
操作3，post请求发送xml数据返回xml数据，通过官方下载的工具类实现xml转map获取预支付id
操作4，封装jsapi需要的
在微信浏览器里面打开H5网页中执行JS调起支付。接口输入输出数据格式为JSON。
ok，到此结束，微信支付成功调起。
需要注意的地方。
微信回调到时候会携带xml数据，这个时候并不能用参数接收，而应该是使用流来接收。
贴出完整代码，记录下
后台java代码
/**
*
*/
package com.wxpay.config;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.time.DateFormatUtils;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.client.RestTemplate;
import com.alibaba.fastjson.JSONObject;
import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.internal.util.AlipaySignature;
import com.alipay.api.request.AlipayTradeWapPayRequest;
import com.alipay.api.response.AlipayTradeWapPayResponse;
import com.alipay.config.AlipayConfig;
import com.jeecms.cms.entity.main.CmsSite;
import com.jeecms.cms.ext.aworder.entiry.CmsAWOrder;
import com.jeecms.cms.ext.aworder.service.CmsAWOrderService;
import com.jeecms.cms.ext.crm.entity.CmsCrm;
import com.jeecms.cms.ext.crm.service.CmsCrmMng;
import com.jeecms.cms.web.CmsUtils;
import com.jeecms.cms.web.FrontUtils;
import com.wxpay.util.WXPayUtil;
/**
* @author chy
*
* 2019年1月15日-下午7:35:06
*/
@Controller
@RequestMapping("wxpay")
public class WxPayController {// 公众号id
final static String APPID = "***ed9716263ff78b6";
// 公众号秘钥
final static String SECRET = "***2226ea83d7ef6eb799bd8b631ace0";
// 商户号
final static String MATCH_ID = "***0674102"; //商户号(财务)
// 商户key
final static String PATERNER_KEY = "***W3E4R5T6Y7U8I9O0P1Q2W3E4R5T6Y";//商户key(财务)
// 微信通知的URL
final static String W_NOTIFY_URL = "www.xinghengedu.com/notifyUrl.htm";
// 支付宝return的URL
final static String A_RETURN_URL = "www.xinghengedu.com/res/success.html";
// 支付宝通知的URL
final static String A_NOTIFY_URL = "www.xinghengedu.com/anotifyUrl.htm";
// 获取openID的URL(微信)
final static String GETOPENID_URL = "https://api.weixin.qq.com/sns/oauth2/access_token";
// 获取预付款ID的URL(微信)
final static String UNIFIEDORDER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";
final static String DESC = "星恒订单描述";
final static String ZFB = "支付宝";
final static String WX = "微信";
@Autowired
private CmsAWOrderService orderService;
@Autowired
private CmsCrmMng cmsCrmService;
/**
* 微信
* @author chy
* 2019年1月17日-下午2:14:31
* @param code 微信必须的code码，需要用code码换取openid，之后需要openid来换取prepay_id。
* @param totalFee 商品价格
* @param username 代理商用户名
* @return
* @throws Exception
*/
@RequestMapping("order.htm")
public String order(HttpServletRequest request,String code,String totalFee,String cmsId ,ModelMap retMap) throws Exception{
System.out.println("***WxPayController.order()");
//先校验金额，由于是double类型，校验相对复杂，涉及到小数点。
String[] split = StringUtils.split(cmsId,",");
Double verify = 0d;
for (String string : split) {
CmsCrm crm = cmsCrmService.findById(Integer.parseInt(string));
verify += crm.getYifu();
}
// 判断需要都转化为分来进行判断
if((int)(verify*100) != (int)(Double.parseDouble(totalFee)*100)){
retMap.addAttribute("chymsg", "金额错误");
return "/res/wxpay/codeDemo.html";
}
String orderNo = getOrderNo("W");// 生成订单id
String getOpenIdparam= "appid="+APPID+"&secret="+SECRET+"&code="+code+"&grant_type=authorization_code";
String getOpenIdUrl = GETOPENID_URL+"?"+getOpenIdparam;
System.out.println("***getOpenId:"+getOpenIdUrl);
RestTemplate rest = new RestTemplate();
rest.getMessageConverters().add(0, new StringHttpMessageConverter(Charset.forName("UTF-8")));
try {
String resString = rest.getForObject(new URI(getOpenIdUrl), String.class);
JSONObject opidJsonObject = JSONObject.parseObject(resString);
System.out.println("***opidJsonObject:"+opidJsonObject);
String openid = opidJsonObject.get("openid").toString();//获取到了openid
Map<String, String> paramMap = new HashMap<String, String>();
paramMap.put("appid", APPID); //公众账号ID
paramMap.put("mch_id", MATCH_ID); //商户号
paramMap.put("nonce_str", WXPayUtil.generateNonceStr()); //随机字符串
paramMap.put("body", DESC); //商品描述
paramMap.put("out_trade_no", orderNo); //商户订单号
paramMap.put("total_fee", (int)(Double.parseDouble(totalFee)*100) +""); //标价金额
paramMap.put("spbill_create_ip", getIpAddress(request));//终端IP
paramMap.put("notify_url", W_NOTIFY_URL); //通知地址
paramMap.put("trade_type", "JSAPI"); //交易类型
paramMap.put("openid", openid);
String sign = WXPayUtil.generateSignature(paramMap, PATERNER_KEY);
paramMap.put("sign", sign);
String mapToXml = WXPayUtil.mapToXml(paramMap);
String postForObject = rest.postForObject(new URI(UNIFIEDORDER_URL), mapToXml, String.class);
System.out.println("***postForObject:"+postForObject);
String prepayId = "";//预支付id
if (postForObject.indexOf("SUCCESS") != -1) {
Map<String, String> map = WXPayUtil.xmlToMap(postForObject);
prepayId = (String) map.get("prepay_id");
}
Map<String, String> payMap = new HashMap<String, String>();
payMap.put("appId", APPID);
payMap.put("timeStamp", WXPayUtil.getCurrentTimestamp()+"");
payMap.put("nonceStr", WXPayUtil.generateNonceStr());
payMap.put("signType", "MD5");
payMap.put("package", "prepay_id=" + prepayId);
String paySign = WXPayUtil.generateSignature(payMap, PATERNER_KEY);
payMap.put("paySign", paySign);
payMap.put("pack", "prepay_id=" + prepayId);
retMap.addAttribute("data", payMap);
//进行微信生成订单操作
// 对中间表插入数据，如果传入多个crmid，那就是多对一。否则就是一对一，多对多目前没有这种情况。
for (String string : split) {
CmsCrm crm = cmsCrmService.findById(Integer.parseInt(string));
orderService.insertCmsIdAndOrderId(crm.getId(),orderNo);
System.out.println("中间表数据插入完毕。");
}
// 对订单表插入数据
CmsAWOrder order = new CmsAWOrder();
order.setOrderNo(orderNo);
order.setRelateId(cmsId);
order.setPrice(Double.parseDouble(totalFee));
order.setTotal(Double.parseDouble(totalFee)); // 由于传过来的是分，需要转化为元
order.setStatus(1);
order.setProduct(DESC);
order.setCreateTime(new Date());
order.setSource(WX);
orderService.save(order);
System.out.println("***微信创建订单成功");
} catch (Exception e) {
retMap.put("code", "500");
retMap.put("msg", e.getStackTrace());
e.printStackTrace();
}
return "/res/wxpay/codeDemo.html";
}
/**
* 支付宝，测试可以使用支付宝做测试，毕竟比较简单。
* @author chy
* 2019年1月17日-下午2:14:15
* @param totalFee 商品价格
* @param username 代理商用户名
* @return
* @throws AlipayApiException
*/
@RequestMapping("aorder.htm")
public String order(HttpServletRequest request,HttpServletResponse httpResponse,Model model,String totalFee,String cmsId) throws AlipayApiException{
CmsSite site = CmsUtils.getSite(request);
System.out.println("---WxPayController.order()");
String[] split = StringUtils.split(cmsId,",");
Double verify = 0d;
for (String string : split) {
CmsCrm crm = cmsCrmService.findById(Integer.parseInt(string));
verify += crm.getYifu();
}
// 判断需要都转化为分来进行判断
if((int)(verify*100) != (int)(Double.parseDouble(totalFee)*100)){
model.addAttribute("chymsg", "金额错误");
return FrontUtils.getTplPath(request, site.getSolutionPath(), "common", "tpl.alipayapi");
}
System.out.println("***zfbtotalFee:"+totalFee);
AlipayClient alipayClient = new DefaultAlipayClient(AlipayConfig.gatewayUrl, AlipayConfig.app_id,AlipayConfig.merchant_private_key, "json", "UTF-8", AlipayConfig.alipay_public_key,AlipayConfig.sign_type);
AlipayTradeWapPayRequest alipayRequest = new AlipayTradeWapPayRequest();//创建API对应的request
alipayRequest.setReturnUrl(A_RETURN_URL);
alipayRequest.setNotifyUrl(A_NOTIFY_URL);
String out_trade_no = getOrderNo("A");
alipayRequest.setBizContent("{" +
"\"out_trade_no\":\""+out_trade_no+"\"," +
"\"total_amount\":"+totalFee+"," +
"\"product_code\":\"QUICK_WAP_WAY\","+
"\"hb_fq_num\":\"3\","+
"\"hb_fq_seller_percent\":\"0\","+
"\"subject\":\""+DESC+"\"" +
"}");
AlipayTradeWapPayResponse response = alipayClient.pageExecute(alipayRequest);
model.addAttribute("results", response.getBody());
System.out.println("results"+response.getBody());
//进行支付宝生成订单操作
// 对中间表插入数据，如果传入多个crmid，那就是多对一。否则就是一对一，多对多目前没有这种情况。
for (String string : split) {
CmsCrm crm = cmsCrmService.findById(Integer.parseInt(string));
orderService.insertCmsIdAndOrderId(crm.getId(),out_trade_no);
System.out.println("中间表数据插入完毕。");
}
// 对订单表插入数据
CmsAWOrder order = new CmsAWOrder();
order.setOrderNo(out_trade_no);
order.setRelateId(cmsId);
order.setPrice(Double.parseDouble(totalFee));
order.setTotal(Double.parseDouble(totalFee)); // 由于传过来的是分，需要转化为元
order.setStatus(1);
order.setProduct(DESC);
order.setCreateTime(new Date());
order.setSource(ZFB);
orderService.save(order);
System.out.println("***支付宝创建订单成功");
return FrontUtils.getTplPath(request, site.getSolutionPath(), "common", "tpl.alipayapi");
}
// 业务操作
public void operation(String oderNo,String zfType){
CmsAWOrder order = orderService.findByProperty("orderNo", oderNo);
// 由于会重复通知(自己没有处理好),所以直接判断订单状态如果修改的话不进行操作。
if(!new Integer(2).equals(order.getStatus())){
order.setStatus(2);//设置为支付成功
order.setPayTime(new Date());
List<Integer> cmsId = orderService.findMiddleByOrderId(oderNo);
System.out.println(cmsId);
for (Integer string : cmsId) {
CmsCrm cmsCrm = cmsCrmService.findById(string);
System.out.println("ali_cmsId:"+string);
System.out.println("cmsCrm:"+cmsCrm);
if("尾款".equals(cmsCrm.getPayMessage()) || cmsCrm.getYingfu().equals(cmsCrm.getYifu())){
cmsCrm.setPaystatus("全部到帐");
if(isNumber(cmsCrm.getAddress())){
CmsCrm cmsCrm2 = cmsCrmService.findById(Integer.parseInt(cmsCrm.getAddress()));
cmsCrm2.setPaystatus("全部到帐");
cmsCrm2.setCwjingbanren("自动对账_"+zfType);
cmsCrm2.setDuizhangtime(new Date());
cmsCrmService.save(cmsCrm2);
}
// }else if(cmsCrm.getYingfu().equals(cmsCrm.getYifu())){
// cmsCrm.setPaystatus("全部到帐");
}else{
cmsCrm.setPaystatus("预付款已到帐");
}
cmsCrm.setCwjingbanren("自动对账_"+zfType);
cmsCrm.setDuizhangtime(new Date());
cmsCrmService.save(cmsCrm);//开课
cmsCrmService.kaike(cmsCrm);//保存
}
orderService.update(order);
System.out.println(zfType+"支付通知结束");
}
}
/**
* 微信异步回调通知
* @param request
* @param response
* @return
*/
@ResponseBody
@RequestMapping("notifyUrl.htm")
public Map<String, Object> notifyUrl(HttpServletRequest request,HttpServletResponse response){
System.out.println("**WxPayController.notifyUrl()");
Map<String, Object> retMap = new HashMap<String, Object>();
retMap.put("code", 200);
InputStream is = null;
try {
is = request.getInputStream();//获取请求的流信息(这里是微信发的xml格式所有只能使用流来读)
String xml = WXPayUtil.inputStream2String(is, "UTF-8");
System.out.println("***xml:"+xml);
Map<String, String> notifyMap = WXPayUtil.xmlToMap(xml);//将微信发的xml转map
System.out.println("***notifyMap:"+notifyMap);
if(notifyMap.get("return_code").equals("SUCCESS")){
if(notifyMap.get("result_code").equals("SUCCESS")){
String ordersSn = notifyMap.get("out_trade_no");//商户订单号
String amountpaid = notifyMap.get("total_fee");//实际支付的订单金额:单位 分
BigDecimal amountPay = (new BigDecimal(amountpaid).divide(new BigDecimal("100"))).setScale(2);//将分转换成元-实际支付金额:元
System.out.println("***notifyUrl.htm data:"+ordersSn+"---"+amountPay);
// 进行业务逻辑操作
operation(ordersSn, WX);
}
}
//告诉微信服务器收到信息了，不要在调用回调action了========这里很重要回复微信服务器信息用流发送一个xml即可
response.getWriter().write("<xml><return_code><![CDATA[SUCCESS]]></return_code></xml>");
is.close();
} catch (Exception e) {
e.printStackTrace();
}
return retMap;
}
@ResponseBody
@RequestMapping("anotifyUrl.htm")
public Map<String, Object> anotifyUrl(HttpServletRequest request){
System.out.println("***WxPayController.anotifyUrl()");
Map<String, Object> retMap = new HashMap<String, Object>();
retMap.put("code", 200);
//进行验证操作
Map<String, String> params = new HashMap<String, String>();
Map requestParams = request.getParameterMap();
System.out.println("***requestParams:"+requestParams);
for (Iterator iter = requestParams.keySet().iterator(); iter.hasNext();) {
String name = (String) iter.next();
System.out.println("___________name:"+name);
String[] values = (String[]) requestParams.get(name);
String valueStr = "";
for (int i = 0; i < values.length; i++)
valueStr = (i == values.length - 1) ? valueStr + values[i] : valueStr + values[i] + ",";
params.put(name, valueStr);
}
String trade_status = request.getParameter("trade_status");
boolean signVerified;
try {
signVerified = AlipaySignature.rsaCheckV1(params, AlipayConfig.alipay_public_key, AlipayConfig.charset, AlipayConfig.sign_type);
if(signVerified){//验证成功
System.out.println("***支付宝验证成功");
if (trade_status.equals("TRADE_FINISHED") || trade_status.equals("TRADE_SUCCESS")) {
System.out.println("***判断成功");
// 进行业务逻辑操作
String out_trade_no = request.getParameter("out_trade_no");
operation(out_trade_no, ZFB);
}
} else {
System.out.println("***验证错误");
}
} catch (AlipayApiException e) {
e.printStackTrace();
}
return retMap;
}
// 获取订单id 规则：当前日期_uuid(17位，总共32位) 支付宝64位。
public static String getOrderNo(String type){
return DateFormatUtils.format(new Date(), "yyyyMMddHHmmss")+"_"+type+"_"+WXPayUtil.generateNonceStr().substring(0, 15);
}
// 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址
public final static String getIpAddress(HttpServletRequest request) throws IOException {
String ip = request.getHeader("X-Forwarded-For");
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("HTTP_CLIENT_IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("HTTP_X_FORWARDED_FOR");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
} else if (ip.length() > 15) {
String[] ips = ip.split(",");
for (int index = 0; index < ips.length; index++) {
String strIp = (String) ips[index];
if (!("unknown".equalsIgnoreCase(strIp))) {
ip = strIp;
break;
}
}
}
return ip;
}
public boolean isNumber(String string){
String str = String.valueOf(string);
String regex = "^[1-9]\\d*$";
return str.matches(regex);
}
}
前端html代码（两个页面，集成了支付宝支付，微信怕因为code失效问题，解决方式重新添加了一个html）
cmsDemo.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<title>支付</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<style>
body{background-color:#efeff4;}
.main{padding:15px;height:100vh;}
.mobile-box{padding:30px;background-color:#fff;}
.mobile-top h2{font-size:18px;color:#000;}
.mobile-content h3 img{margin-right:5px;}
.mobile-content h3{font-size:14px;color:#b******2;}
.input-num{border-bottom: 1px solid #dcdcdc;margin-bottom: 5vh;padding-top: 5vh;}
.input-num .tit{font-size:16px;color:#999;}
.input-num .pay{position:relative;line-height: 50px;margin:10px 0;}
.input-num .pay input{padding-left: 30px;line-height: 50px;border:none;outline:none;}
.input-num .pay span.jinbi{font-weight:bold;color:#000;font-size:24px;position: absolute;left: 0;top: 0;}
.pay-click a.nopay{cursor: pointer;background-color: #a3dea3;color: #fff;width: 100%;display: block;border-radius: 5px;line-height: 50px;font-size: 20px;}
.pay-click a.pay{background-color:#1aac19;}
input[type=number] {-moz-appearance:textfield;}
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {-webkit-appearance: none; margin: 0;}
@media(min-width:720px){
.mobile-box{width:720px;margin:0 auto;}
}
</style>
</head>
<body>
<div class="main">
<div class="mobile-box">
<div class="mobile-top ">
<div class="back">
<i class="fa fa-angle-left fa-2x"></i>
</div>
<h2 class="top-center color21">北京星恒教育科技有限公司</h2>
<div class="back"></div>
</div>
<div class="mobile-content">
<h3 class="color21 font">
<img src="http://img1.52mamahome.com/hotel/homes.png" class="mr10" alt="">北京星恒教育科技有限公司</h3>
<div class="input-num">
<div class="tit">金额</div>
<div class="pay">
<span class="jinbi">￥</span>
<input type="number" class="w-100" id="totalFee" readonly="readonly">
</div>
</div>
<p class="text-center pay pay-click" id="goPay" onclick="pay()
标签：java,String,微信,JSAPI,ip,import,com,order,out 来源： https://www.cnblogs.com/adolfmc/p/13694638.html