微信公众号的永久二维码,在根据官方提供的文档踩了N个坑后,终于是调试通了,写个随笔文章。
一、纯属个人理解:
1、微信JSAPI是对于微信公众号来接入开发的,需要有微信公众号和商户号。
2、提供生成的二维码,做线下支付。客户通过扫二维码,输入金额,实时生成订单支付。
3、简单点说就实现微信的个人对商户的转账功能。
二、微信JSAPI支付的基本流程
1、用户打开微信客户端扫码二维码
2、打开微信内置浏览器,登陆授权(获取微信服务端返回的参数openid)
3、输入金额,调用统一下单接口,提交生成订单(获取微信服务端返回的参数prepay_id)
4、用户确认订单,发起支付。
5、输入密码,完成支付。
三、代码
1、授权获取openid
授权可以查看官方文档 http://mp.weixin.qq.com/wiki/4/9ac2e7b1f1d22e9e57260f6553822520.html ,获取CODE,根据code参数获取openid
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//获取配置文件中配置的生产参数
Map map = loadConfiguration.getWechat("wechat");
//网页授权获取CODE
String code = request.getParameter("code");
//获取商户生产参数
String appid = (String)map.get("appid");
String appsecret = (String)map.get("appsecret");
String openId ="";
String tempValue="";
String URL = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="+appid+"&secret="+appsecret+"&code="+code+"&grant_type=authorization_code";
HttpResponse temp = HttpConnect.getInstance().doGetStr(URL);
if( temp == null){
System.out.println("error");
response.sendRedirect("/pay/error.jsp");
}else{
try {
tempValue = temp.getStringResult();
} catch (Exception e) {
e.printStackTrace();
}
JSONObject jsonObj = JSONObject.fromObject(tempValue);
if(jsonObj.containsKey("errcode")){
response.sendRedirect("/pay/error.jsp");
}
openId = jsonObj.getString("openid");
}
response.sendRedirect("/pay/payment.jsp?openId="+openId+"");
}
2、用户输入金额,发起订单支付请求 payment.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String openId = request.getParameter("openId");
%>
微信JSAPI支付
企业微信-线下扫码支付
3、生成预支付订单,获取prepay_id
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Map map = loadConfiguration.getWechat("wechat");
//获取商户生产参数
String appid = (String)map.get("appid");
String appsecret = (String)map.get("appsecret");
String mch_id = (String)map.get("partner");
String partnerkey = (String)map.get("partnerkey");
String notify_url = (String)map.get("notify_url");
String trade_type = (String)map.get("trade_type");
//网页授权后根据填入的金额自动生成订单
String money = request.getParameter("amount");
String openid = request.getParameter("openId");
String prepay_id="";
//金额转化为分为单位
float sessionmoney = Float.parseFloat(money);
String finalmoney = String.format("%.2f", sessionmoney);
finalmoney = finalmoney.replace(".", "");
int total_fee = Integer.parseInt(finalmoney);
finalmoney = String.valueOf(total_fee);
System.out.println(openid+"***"+money+"***"+finalmoney+"***"+total_fee);
//获取openId后调用统一支付接口https://api.mch.weixin.qq.com/pay/unifiedorder
String currTime = TenpayUtil.getCurrTime();
//8位日期
String strTime = currTime.substring(8, currTime.length());
//四位随机数
String strRandom = TenpayUtil.buildRandom(4) + "";
//10位序列号,可以自行调整。
String nonce_str = strTime + strRandom;
//商品描述根据情况修改
String body = "";
//商户订单号
String out_trade_no = currTime+strRandom;
//订单生成的机器 IP
String spbill_create_ip = request.getRemoteAddr();
SortedMap packageParams = new TreeMap();
packageParams.put("appid", appid);
packageParams.put("mch_id", mch_id);
packageParams.put("nonce_str", nonce_str);
packageParams.put("body", body);
packageParams.put("out_trade_no", out_trade_no);
packageParams.put("total_fee", finalmoney);
packageParams.put("spbill_create_ip", spbill_create_ip);
packageParams.put("notify_url", notify_url);
packageParams.put("trade_type", trade_type);
packageParams.put("openid", openid);
RequestHandler reqHandler = new RequestHandler(request, response);
reqHandler.init(appid, appsecret, partnerkey);
String sign = reqHandler.createSign(packageParams);
String xml=""+
""+appid+" "+
""+mch_id+" "+
""+nonce_str+" "+
""+sign+" "+
""+
""+out_trade_no+" "+
""+total_fee+" "+
""+spbill_create_ip+" "+
""+notify_url+" "+
""+trade_type+" "+
""+openid+" "+
" ";
System.out.println(xml);
String createOrderURL = "https://api.mch.weixin.qq.com/pay/unifiedorder";
try {
prepay_id = new GetWxOrderno().getPayNo(createOrderURL, xml);
if(prepay_id.equals("")){
response.sendRedirect("/pay/error.jsp");
return;
}
} catch (Exception e1) {
e1.printStackTrace();
}
SortedMap finalpackage = new TreeMap();
String timestamp = Sha1Util.getTimeStamp();
String prepay_ids = "prepay_id="+prepay_id;
finalpackage.put("appId", appid);
finalpackage.put("timeStamp", timestamp);
finalpackage.put("nonceStr", nonce_str);
finalpackage.put("package", prepay_ids);
finalpackage.put("signType", "MD5");
String finalsign = reqHandler.createSign(finalpackage);
response.sendRedirect("/pay/pay.jsp?appid="+appid+"&timeStamp="+timestamp+"&nonceStr="+nonce_str+"&package="+prepay_ids+"&sign="+finalsign);
}
4、发起支付请求 pay.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String appId = request.getParameter("appid");
String timeStamp = request.getParameter("timeStamp");
String nonceStr = request.getParameter("nonceStr");
String packageValue = request.getParameter("package");
String paySign = request.getParameter("sign");
%>
微信支付
四、注意
1、登陆微信公众平台——接口权限——网页服务——网页账号。配置好授权回调页面域名,在你第一步授权时通过回调页面获取CODE参数。
2、登陆微信公众平台——微信支付——开发配置——支付授权目录。配置号支付授权目录,在最终发起支付的界面必须要放在该目录下,一级目录、二级目录都有效。(支付授权目录为http://域名/pay/,那么支付界面就在http://域名/pay/pay.jsp)
五、工具
1、在测试阶段可以下载微信web开发者工具进行授权测试 https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1455784140&token=&lang=zh_CN (需要绑定测试微信账号 :登陆微信公众平台——开发者工具——web开发者工具——绑定开发者微信账号)
2、具体demo可以查看上传的 WePay 文件