目录标题
- 参考链接
- 准备事项
- 开发工具
- 使用框架
- 小程序代码
- pom.xml
- 后台java代码
- 用到的外部jar包和工具类
- 补充说明
参考链接
- 微信官方支付文档
- csdn博客
准备事项
小程序appid
进入
小程序AppSecret
商户id
商户平台api密钥
后台服务器（听说可以使用云开发就不用准备服务器，但是我这边使用的不是云开发）
开发工具
eclipse+tomcat+微信开发者工具
使用框架
spring,spring-mvc
小程序代码
//获取用户openid getWXOpenId: function () { var that = this; wx.login({ //获取code success: function (res) { var code = res.code; //返回code var appId = '填入appid'; var secret = '填入sercret'; wx.request({ url: 'https://api.weixin.qq.com/sns/jscode2session?appid=' + appId + '&secret=' + secret + '&js_code=' + code + '&grant_type=authorization_code', data: {}, header: { 'content-type': 'json' }, success: function (res) { var openid = res.data.openid //返回openid that.setData({ openId: openid }); that.buyGoods(openid); } }) } }); }, //发送信息到后台 buyGoods: function (openId) { var that = this; var courseName = 0; //后台服务地址 var address = "后台接口路径"; wx.request({ url: address, data: { openId: openId, courseName: courseName }, header: { 'content-type': 'application/x-www-form-urlencoded' // 默认值 }, method: "POST", success: function (res) { console.log(res); that.doWxPay(res.data); }, fail: function (err) { wx.showToast({ icon: "none", title: '服务器异常，清稍候再试' }) }, }); }, doWxPay(param) { console.log(param); //小程序发起微信支付 wx.requestPayment({ timeStamp: param.data.timeStamp,//记住，这边的timeStamp一定要是字符串类型的，不然会报错 nonceStr: param.data.nonceStr, package: param.data.package, signType: 'MD5', paySign: param.data.paySign, success: function (event) { // success console.log(event); wx.showToast({ title: '支付成功', icon: 'success', duration: 2000 }); }, fail: function (error) { // fail console.log("支付失败") console.log(error) }, complete: function () { // complete console.log("pay complete") } }); },pom.xml
有很多是用不到的，可以自己去掉
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.jt</groupId> <artifactId>pay</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.3.9.RELEASE</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.40</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.29</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.8</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.9.RELEASE</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.8.5</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency><groupId>org.apache.shiro</groupId><artifactId>shiro-spring</artifactId><version>1.3.2</version></dependency><!-- https://mvnrepository.com/artifact/commons-httpclient/commons-httpclient --><dependency> <groupId>commons-httpclient</groupId> <artifactId>commons-httpclient</artifactId> <version>3.1</version></dependency><dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.2</version></dependency> </dependencies></project>后台java代码
package com.jt.sys.controller;import java.io.BufferedReader;import java.io.ByteArrayInputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.URL;import java.util.ArrayList;import java.util.Arrays;import java.util.Collections;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Random;import org.apache.commons.httpclient.HttpException;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.impl.client.HttpClientBuilder;import org.apache.http.protocol.HTTP;import org.apache.http.util.EntityUtils;import org.springframework.http.HttpMethod;import org.springframework.http.ResponseEntity;import org.springframework.stereotype.Controller;import org.springframework.util.DigestUtils;import org.springframework.util.LinkedMultiValueMap;import org.springframework.util.MultiValueMap;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.client.RestTemplate;import com.jt.common.vo.HttpRequest;import com.jt.common.vo.HttpUtil;import com.jt.common.vo.JsonResult;@RequestMapping("/")@Controllerpublic class PageController {@RequestMapping("test")public String test(){return "test";}@RequestMapping("buyStepOne")@ResponseBodypublic JsonResult buyStepOne(String openId,String courseName) throws UnsupportedEncodingException {String appId = "appid";String mch_id = "商户id";String notify_url = "支付成功后台回调地址";String trade_type = "JSAPI";//签名类型String SIGNTYPE = "MD5";//第一次发起支付请求的接口地址String pay_url = "https://api.mch.weixin.qq.com/pay/unifiedorder";//key为商户平台设置的密钥keyString WXKeHukey = "商户平台密钥";//生成的随机字符串String nonce_str = getRandomString(32);//商品名称String body = new String(courseName.getBytes("ISO-8859-1"),"UTF-8");//本机的ip地址String spbill_create_ip = "ip地址";//商户订单号（先用时间代替）Date date = new Date();String orderNo = date.getTime()+"";String money = "1";//支付金额，单位：分，这边需要转成字符串类型，否则后面的签名会失败Map<String, String> packageParams = new HashMap<String, String>();//小程序ID,微信分配的小程序IDpackageParams.put("appid", appId);//商户号,微信支付分配的商户号packageParams.put("mch_id", mch_id);//随机字符串，长度要求在32位以内。packageParams.put("nonce_str", nonce_str);//商品简单描述packageParams.put("body", body);//商户系统内部订单号，要求32个字符内，只能是数字、大小写字母_-|*且在同一个商户号下唯一packageParams.put("out_trade_no", orderNo);//商户订单号//订单总金额，单位为分packageParams.put("total_fee", money);//终端IP,支持IPV4和IPV6两种格式的IP地址。调用微信支付API的机器IPpackageParams.put("spbill_create_ip", spbill_create_ip);//异步接收微信支付结果通知的回调地址，通知url必须为外网可访问的url，不能携带参数。packageParams.put("notify_url", notify_url);//交易类型(JSAPI--JSAPI支付（或小程序支付）、NATIVE--Native支付、APP--app支付，MWEB--H5支付，不同trade_type决定了调起支付的方式，请根据支付产品正确上传)packageParams.put("trade_type", trade_type);//用户标识,trade_type=JSAPI，此参数必传，用户在商户appid下的唯一标识。packageParams.put("openid", openId); // 除去数组中的空值和签名参数packageParams = paraFilter(packageParams);String prestr = createLinkString(packageParams); // 把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串//MD5运算生成签名，这里是第一次签名，用于调用统一下单接口,key为商户平台设置的密钥keyString mysign = sign(prestr, WXKeHukey, "utf-8").toUpperCase();System.out.println("=======================第一次签名：" + mysign + "=====================");//拼接统一下单接口使用的xml数据，要将上一步生成的签名一起拼接进去String xml = "<xml version='1.0' encoding='gbk'>" + "<appid>" + appId + "</appid>" + "<body><![CDATA[" + body + "]]></body>" + "<mch_id>" + mch_id + "</mch_id>" + "<nonce_str>" + nonce_str + "</nonce_str>" + "<notify_url>" + notify_url + "</notify_url>" + "<openid>" + openId + "</openid>" + "<out_trade_no>" + orderNo + "</out_trade_no>" + "<spbill_create_ip>" + spbill_create_ip + "</spbill_create_ip>" + "<total_fee>" + money + "</total_fee>" + "<trade_type>" + trade_type + "</trade_type>" + "<sign>" + mysign + "</sign>" + "</xml>"; System.out.println("调试模式_统一下单接口 请求XML数据：" + xml);//调用统一下单接口，并接受返回的结果String result = httpRequest(pay_url, "POST", xml); System.out.println("调试模式_统一下单接口 返回XML数据：" + result); // 将解析结果存储在HashMap中//Map map = doXMLParse(result); //String return_code = (String) map.get("return_code");//返回状态码//解析结果，将结果存在map中Map map = doXMLToMap(result);String return_code = (String) map.get("return_code"); //返回给移动端需要的参数 Map<String, Object> response = new HashMap<String, Object>(); if(return_code == "SUCCESS" || return_code.equals(return_code)){ // 业务结果 String prepay_id = (String) map.get("prepay_id");//返回的预付单信息 response.put("nonceStr", nonce_str); response.put("package", "prepay_id=" + prepay_id); Long timeStamp = System.currentTimeMillis() / 1000; response.put("timeStamp", timeStamp + "");//这边要将返回的时间戳转化成字符串，不然小程序端调用wx.requestPayment方法会报签名错误 String stringSignTemp = "appId=" + appId + "&nonceStr=" + nonce_str + "&package=prepay_id=" + prepay_id+ "&signType=" + SIGNTYPE + "&timeStamp=" + timeStamp; //再次签名，这个签名用于小程序端调用wx.requesetPayment方法 String paySign = sign(stringSignTemp, WXKeHukey, "utf-8").toUpperCase(); System.out.println("=======================第二次签名：" + paySign + "====================="); response.put("paySign", paySign); response.put("appid", appId); } return new JsonResult(response); }/** * 解析xml，取出其中的result_code，和prepay_id */public HashMap<String ,String> doXMLToMap(String results) {HashMap<String ,String> result = new HashMap<String ,String>();String return_code = results.substring(results.indexOf("<return_code><![CDATA[")+22, results.indexOf("]]></return_code>"));result.put("return_code", return_code);if(return_code.equals("SUCCESS")) {String prepay_id = results.substring(results.indexOf("<prepay_id><![CDATA[")+20, results.indexOf("]]></prepay_id>"));result.put("prepay_id", prepay_id);}return result;}/** * * @param requestUrl请求地址 * @param requestMethod请求方法 * @param outputStr参数 */public static String httpRequest(String requestUrl, String requestMethod, String outputStr) {// 创建SSLContextStringBuffer buffer = null;try {URL url = new URL(requestUrl);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod(requestMethod);conn.setDoOutput(true);conn.setDoInput(true);conn.connect();// 往服务器端写内容if (null != outputStr) {OutputStream os = conn.getOutputStream();os.write(outputStr.getBytes("utf-8"));os.close();}// 读取服务器端返回的内容InputStream is = conn.getInputStream();InputStreamReader isr = new InputStreamReader(is, "utf-8");BufferedReader br = new BufferedReader(isr);buffer = new StringBuffer();String line = null;while ((line = br.readLine()) != null) {buffer.append(line);}br.close();} catch (Exception e) {e.printStackTrace();}return buffer.toString();}/** * 除去数组中的空值和签名参数 * * @param sArray 签名参数组 * @return 去掉空值与签名参数后的新签名参数组 */public static Map<String, String> paraFilter(Map<String, String> sArray) {Map<String, String> result = new HashMap<String, String>();if (sArray == null || sArray.size() <= 0) {return result;}for (String key : sArray.keySet()) {String value = sArray.get(key);if (value == null || value.equals("") || key.equalsIgnoreCase("sign")|| key.equalsIgnoreCase("sign_type")) {continue;}result.put(key, value);}return result;}/** * 把数组所有元素排序，并按照“参数=参数值”的模式用“&”字符拼接成字符串 * * @param params 需要排序并参与字符拼接的参数组 * @return 拼接后字符串 */public static String createLinkString(Map<String, String> params) {List<String> keys = new ArrayList<String>(params.keySet());Collections.sort(keys);String prestr = "";for (int i = 0; i < keys.size(); i++) {String key = keys.get(i);String value = params.get(key);if (i == keys.size() - 1) {// 拼接时，不包括最后一个&字符prestr = prestr + key + "=" + value;} else {prestr = prestr + key + "=" + value + "&";}}return prestr;}/** * 签名字符串 * @param text需要签名的字符串 * @param key 密钥 * @param input_charset编码格式 * @return 签名结果 */public static String sign(String text, String key, String input_charset) {text = text + "&key=" + key;return DigestUtils.md5DigestAsHex(getContentBytes(text, input_charset)); }/** * @param content * @param charset * @return * @throws SignatureException * @throws UnsupportedEncodingException */public static byte[] getContentBytes(String content, String charset) {if (charset == null || "".equals(charset)) {return content.getBytes();}try {return content.getBytes(charset);} catch (UnsupportedEncodingException e) {throw new RuntimeException("MD5签名过程中出现错误,指定的编码集不对,您目前指定的编码集是:" + charset);}} /** * 支付成功后回调方法 * @return */@RequestMapping("buySteptwo")@ResponseBodypublic JsonResult buySteptwo() { Map<String, Object> params = getParamsMap(); try { //读取参数 InputStream inputStream ; StringBuffer sb = new StringBuffer(); inputStream = getRequest().getInputStream(); String s ; BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8")); while ((s = in.readLine()) != null){ sb.append(s); } in.close(); inputStream.close(); //解析xml成map Map<String, String> m = new HashMap<String, String>(); m = XMLUtil.doXMLParse(sb.toString()); //过滤空 设置 TreeMap SortedMap<Object,Object> packageParams = new TreeMap<Object,Object>(); Iterator<String> it = m.keySet().iterator(); while (it.hasNext()) { String parameter = it.next(); String parameterValue = m.get(parameter); String v = ""; if(null != parameterValue) { v = parameterValue.trim(); } packageParams.put(parameter, v); } // 微信支付的API密钥 String key = WXKeHukey; // key //判断签名是否正确 if(PayForUtil.isTenpaySign("UTF-8", packageParams,key)) { //------------------------------ //处理业务开始 //------------------------------ String resXml = ""; if("SUCCESS".equals((String)packageParams.get("result_code"))){ System.out.println("+++++++++++++++++++回调参数+++++++++++++++++++"); System.out.println(packageParams); // 这里是支付成功 //执行自己的业务逻辑开始 String app_id = (String)packageParams.get("appid"); String mch_id = (String)packageParams.get("mch_id"); String openid = (String)packageParams.get("openid"); String is_subscribe = (String)packageParams.get("is_subscribe");//是否关注公众号 //公用回传参数 String attach = (String)packageParams.get("attach"); //商户订单号 String out_trade_no = ((String)packageParams.get("out_trade_no")); out_trade_no = out_trade_no.replace(" ", ""); //付款金额【以分为单位】 String total_fee = (String)packageParams.get("total_fee"); //微信生成的交易订单号 String transaction_id = (String)packageParams.get("transaction_id");//微信支付订单号 //支付完成时间 String time_end=(String)packageParams.get("time_end");// //回调一次后进行判断，查询是否以及添加记录到数据库// Record huidiao = Db.findById("c_order" , "order_number", transaction_id);// if(huidiao != null) {// redirect("/");// return;// } //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> "; /** * 支付成功后的处理 */ Record order = Db.findFirst("select * from c_order where order_number = '"+out_trade_no+"'"); System.out.println("+++++++++++++++++++++++++sql+++++++++++++++++++++++++"); System.out.println("select * from c_order where order_number = '"+out_trade_no+"'"); System.out.println(order); //Record order = Db.findById("c_order" , "order_number", out_trade_no); //付款金额 order.set("order_money" ,total_fee); order.set("order_flag", 1 ); order.set("order_time", new Date()); Db.update("c_order", "order_id",order); //TODO 支付成功后去哪个页面 我这里先写首页 rendSuccessJson(); return; } else { lg.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> "; //TODO 支付失败要做什么 我这里先不写 //------------------------------ //处理业务完毕 //------------------------------ BufferedOutputStream out = new BufferedOutputStream( getResponse().getOutputStream()); out.write(resXml.getBytes()); out.flush(); out.close(); } } else{ lg.info("通知签名验证失败"); } }catch(IOException e) { e.printStackTrace(); rendFailedJson("IO处理失败，请联系管理员！"); } catch (JDOMException e) {e.printStackTrace(); rendFailedJson("JDOM处理失败，请联系管理员！");} }//length用户要求产生字符串的长度 public static String getRandomString(int length){ String str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; Random random=new Random(); StringBuffer sb=new StringBuffer(); for(int i=0;i<length;i++){ int number=random.nextInt(62); sb.append(str.charAt(number)); } return sb.toString(); }}用到的外部jar包和工具类
https://download.csdn.net/download/qq_40488121/11704169
补充说明
上线阶段出现了问题，因为微信不希望开发者将appid和密钥存储在前台，所以直接调用微信的接口获取appid是不行的，只能通过后台来获取，这样的话应该是前台一步到位发一次请求就好了，但是我比较懒，就直接把请求微信的接口直接改到后台，直接后台获取openid后放回，其他都不用变
public void getOpenId() {Map<String, Object> params = getParamsMap();String code = params.get("code").toString();String secret = "ede5a99e35a0c99a1ea61df19a1aeb72";String url = "https://api.weixin.qq.com/sns/jscode2session?appid=" + appId + "&secret=" + secret + "&js_code=" + code + "&grant_type=authorization_code";String openid = HttpUtil.doGet(url);renderText(openid);}
