微信成了我们日常生活中常用的一款手机APP软件，做为程序员的我们肯定也会有些客户需要对微信进行二次开发的，其中对微信的支付开发就是我们常见的一种。在对微信进行支付开发之前，首先你的公众号是企业或单位服务号。并且要开通每年300元一次的认证，才有开通支付功能的权限。有了这个权限我们就教大家如何在JAVA中实现对微信公众号的支付开发。
APP_ID和APP_SECRET在公众平台
MCH_ID和API_KEY在商户平台,其中API_KEY是自己设置的，并不是自动生成的。
Controller
通过此方法，前往可以生成二维码的页面
//微信前往支付页面
@RequestMapping(value = "towxPay")
public ModelAndView towxPay(ModelMap map,HttpServletRequest request,String chapterId,String chapterName,String price) throws IOException{
ModelAndView mav = new ModelAndView();
mav.setViewName("jsp/pay/weixinpayma");
HttpSession session = request.getSession();
session.setAttribute("chapterId", chapterId);
session.setAttribute("chapterName", chapterName);
session.setAttribute("price", price);
return mav;
}
返回的页面如下
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="<%=basePath%>js/jquery-3.1.1.min.js"></script>
</head>
<body>
<div id="wxpayma">
<!-- 访问Controller的index/payImg方法，将生成的二维码图片显示在这 -->
<img alt="" src="<%=basePath%>index/payImg">
</div>
<script>
/* ajax轮回，不停的访问Controller，直到wxPayType=1时，付款成功 */
var num = 0;
$(function(){
panduanWXPay();
});
function panduanWXPay(){
$.post("<%=basePath%>index/panduanPay",function(data){
var wxPayType = data.wxPayType;
if(wxPayType==1){
/* 成功 */
window.location.href='<%=basePath%>index/gouMai';
}else if(wxPayType==0 && num!=400){
num++;
panduanWXPay();
}else{
alert("支付超时");
}
});
}
</script>
</body>
</html>
payImg方法
//微信支付，生成二维码
@RequestMapping(value = "payImg")
public void payImg(HttpServletRequest request, HttpServletResponse response) throws IOException{
HttpSession session = request.getSession();
String chapterName=(String)session.getAttribute("chapterName");
String price=(String)session.getAttribute("price");
int defaultWidthAndHeight=200;
String nonce_str = PayCommonUtil.getNonce_str();
long time_stamp = System.currentTimeMillis() / 1000;
String product_id = chapterName+"*"+price;//订单名字和价钱，拼到了一起，后面用到的时候再拆
String key = PayConfigUtil.API_KEY; // key
SortedMap<Object, Object> packageParams = new TreeMap<Object, Object>();
packageParams.put("appid", PayConfigUtil.APP_ID);
packageParams.put("mch_id", PayConfigUtil.MCH_ID);
packageParams.put("time_stamp", String.valueOf(time_stamp));
packageParams.put("nonce_str", nonce_str);
packageParams.put("product_id", product_id);
// packageParams.put("chapterId", chapterId);
// packageParams.put("price", price);
String sign = PayCommonUtil.createSign("UTF-8", packageParams,key);//MD5哈希
packageParams.put("sign", sign);
//生成参数
String str = ToUrlParams(packageParams);
String payurl = "weixin://wxpay/bizpayurl?" + str;
// logger.info("payurl:"+payurl);
//生成二维码
Map<EncodeHintType, Object> hints=new HashMap<EncodeHintType, Object>();
// 指定纠错等级
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
// 指定编码格式
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
hints.put(EncodeHintType.MARGIN, 1);
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(payurl,BarcodeFormat.QR_CODE, defaultWidthAndHeight, defaultWidthAndHeight, hints);
OutputStream out = response.getOutputStream();
MatrixToImageWriter.writeToStream(bitMatrix, "png", out);//输出二维码
out.flush();
out.close();
} catch (WriterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public String ToUrlParams(SortedMap<Object, Object> packageParams){
//实际可以不排序，这里排序是为了能更好的读懂。
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
if (null != v && !"".equals(v)) {
sb.append(k + "=" + v + "&");
}
}
sb.deleteCharAt(sb.length()-1);//删掉最后一个&
return sb.toString();
}
扫码时触动此方法，会在手机端显示付款信息
要将此方法的路径配置到回调url里，微信公众平台–>微信支付–>开发配置
这里写图片描述
微信扫码的时候，触发此方法
@RequestMapping(value = "Re_notify")
public void Re_notify(HttpServletRequest request, HttpServletResponse response) throws IOException{
HttpSession session = request.getSession();
String chapterId=(String)session.getAttribute("chapterId");
String chapterName=(String)session.getAttribute("chapterName");
String price=(String)session.getAttribute("price");
System.out.println(chapterId+":"+chapterName+":"+price);
// 读取xml
InputStream inputStream;
StringBuffer sb = new StringBuffer();
inputStream = request.getInputStream();
String s;
BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
while ((s = in.readLine()) != null) {
sb.append(s);
}
in.close();
inputStream.close();
SortedMap<Object, Object> packageParams = PayCommonUtil.xmlConvertToMap(sb.toString());
// logger.info(packageParams);
// 账号信息
String key = PayConfigUtil.API_KEY; // key
String resXml="";//反馈给微信服务器
// 验签
if (PayCommonUtil.isTenpaySign("UTF-8", packageParams, key)) {
//appid openid mch_id is_subscribe nonce_str product_id sign
//统一下单
String openid = (String)packageParams.get("openid");
String product_id = (String)packageParams.get("product_id");
//解析product_id，计算价格等
String thePricce = product_id.substring(product_id.lastIndexOf("*")+1);
String newProductId = product_id.substring(0, product_id.indexOf("*"));
String out_trade_no = String.valueOf(System.currentTimeMillis()); // 订单号
String order_price = thePricce; // 价格"1" 注意：价格的单位是分
String body = newProductId; // 商品名称product_id 这里设置为product_id
String attach = "十倍课"; //附加数据
String nonce_str0 = PayCommonUtil.getNonce_str();
// 获取发起电脑 ip
String spbill_create_ip = PayConfigUtil.CREATE_IP;
String trade_type = "NATIVE";
SortedMap<Object,Object> unifiedParams = new TreeMap<Object,Object>();
unifiedParams.put("appid", PayConfigUtil.APP_ID); // 必须
unifiedParams.put("mch_id", PayConfigUtil.MCH_ID); // 必须
unifiedParams.put("out_trade_no", out_trade_no); // 必须
unifiedParams.put("product_id", product_id);
unifiedParams.put("body", body); // 必须
unifiedParams.put("attach", attach);
unifiedParams.put("total_fee", order_price); // 必须
unifiedParams.put("nonce_str", nonce_str0); // 必须
unifiedParams.put("spbill_create_ip", spbill_create_ip); // 必须
unifiedParams.put("trade_type", trade_type); // 必须
unifiedParams.put("openid", openid);
unifiedParams.put("notify_url", PayConfigUtil.NOTIFY_URL);//异步通知url
String sign0 = PayCommonUtil.createSign("UTF-8", unifiedParams,key);
unifiedParams.put("sign", sign0); //签名
String requestXML = PayCommonUtil.getRequestXml(unifiedParams);
// logger.info(requestXML);
//统一下单接口，让其他的操作方便调用。
String rXml = HttpUtil.postData(PayConfigUtil.UFDODER_URL, requestXML);
//统一下单响应
SortedMap<Object, Object> reParams = PayCommonUtil.xmlConvertToMap(rXml);
// logger.info(reParams);
//验签
if (PayCommonUtil.isTenpaySign("UTF-8", reParams, key)) {
// 统一下单返回的参数
String prepay_id = (String)reParams.get("prepay_id");//交易会话标识 2小时内有效
String nonce_str1 = PayCommonUtil.getNonce_str();
SortedMap<Object,Object> resParams = new TreeMap<Object,Object>();
resParams.put("return_code", "SUCCESS"); // 必须
resParams.put("return_msg", "OK");
resParams.put("appid", PayConfigUtil.APP_ID); // 必须
resParams.put("mch_id", PayConfigUtil.MCH_ID);
resParams.put("nonce_str", nonce_str1); // 必须
resParams.put("prepay_id", prepay_id); // 必须
resParams.put("result_code", "SUCCESS"); // 必须
resParams.put("err_code_des", "OK");
String sign1 = PayCommonUtil.createSign("UTF-8", resParams,key);
resParams.put("sign", sign1); //签名
resXml = PayCommonUtil.getRequestXml(resParams);
// logger.info(resXml);
}else{
// logger.info("签名验证错误");
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[签名验证错误]]></return_msg>" + "</xml> ";
}
}else{
// logger.info("签名验证错误");
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[签名验证错误]]></return_msg>" + "</xml> ";
}
//------------------------------
//处理业务完毕
//------------------------------
BufferedOutputStream out = new BufferedOutputStream(
response.getOutputStream());
out.write(resXml.getBytes());
out.flush();
out.close();
}
微信支付成功时访问的方法
密码错误等未支付成功的情况下，不会访问。
此路径是PayConfigUtil中配置的
int wxPayType = 0;
//微信扫码支付回调
@RequestMapping(value = "Notify1")
public void Notify1(HttpServletRequest request, HttpServletResponse response) throws IOException{
InputStream inputStream;
StringBuffer sb = new StringBuffer();
inputStream = request.getInputStream();
String s;
BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
while ((s = in.readLine()) != null) {
sb.append(s);
}
in.close();
inputStream.close();
SortedMap<Object, Object> packageParams = PayCommonUtil.xmlConvertToMap(sb.toString());
// logger.info(packageParams);
// 账号信息
String key = PayConfigUtil.API_KEY; // key
String resXml = ""; // 反馈给微信服务器
// 判断签名是否正确
if (PayCommonUtil.isTenpaySign("UTF-8", packageParams, key)) {
// ------------------------------
// 处理业务开始
// ------------------------------
if ("SUCCESS".equals((String) packageParams.get("result_code"))) {
// 这里是支付成功
////////// 执行自己的业务逻辑////////////////
String mch_id = (String) packageParams.get("mch_id");
String openid = (String) packageParams.get("openid");
String is_subscribe = (String) packageParams.get("is_subscribe");
String out_trade_no = (String) packageParams.get("out_trade_no");
String total_fee = (String) packageParams.get("total_fee");
//// 将用于标记是否成功的全局变量wxPayType设置为1，ajax轮回时，可以获取到其变化，从而进行页面跳转////
wxPayType=1;
System.out.println("33333333333333333333333333333:"+wxPayType);
// "支付成功"
// 通知微信.异步确认成功.必写.不然会一直通知后台.八次之后就认为交易失败了.
resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
+ "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";
} else {
// logger.info("支付失败,错误信息：" + packageParams.get("err_code"));
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";
}
} else {
// logger.info("签名验证错误");
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[签名验证错误]]></return_msg>" + "</xml> ";
}
// ------------------------------
// 处理业务完毕
// ------------------------------
BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
out.write(resXml.getBytes());
out.flush();
out.close();
}
ajax不停轮回，判断是否登录成功的方法
@RequestMapping(value = "panduanPay")
@ResponseBody
public Map<String,Object> panduanPay(HttpServletRequest request) throws IOException{
Map<String,Object> map = new HashMap<String,Object>();
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//给页面返回wxPayType值，成功是返回的是1；还未支付成功，返回的是初始值0
map.put("wxPayType",wxPayType);
return map;
}
成功后页面跳转的方法
//购买成功，存入购买表中
@RequestMapping(value="gouMai")
@ResponseBody
public ModelAndView gouMai(HttpServletRequest req,String a,String urlName,String couName,ModelMap map){
ModelAndView mav = new ModelAndView();
Map<String,String> mapp1 = new HashMap<String,String>();
// SysUserTab login_user = sysuserService.getSysUserById(userId);
HttpSession session = req.getSession();
SysUserTab login_user1 = (SysUserTab) session.getAttribute("login_user");
String userId = login_user1.getUserId();
// session.setAttribute("login_user", login_user);
String chapterId = (String) session.getAttribute("chapterId");
mapp1.put("userId", userId);
mapp1.put("chapterId", chapterId);
int num = sysBuyService.getBuyCount(mapp1);
if(num==0){
mapp1.put("buyId", UUID.randomUUID().toString().replace("-", ""));
sysBuyService.insertBuy(mapp1);
}
总结
采用java实现微信的支付，还是有点麻烦。而且在调试阶段需要联网，并且抓包来了解数据库的传输原理。当然在支付的时候肯定的用SSL加密的数据库传输！
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