微信小程序支付, 统一下单, 支付回调, 踩坑记录 有更新!

公司最近开发小程序,涉及到支付功能. 现在支付功能已经做完,特此记录一下自己踩坑经验:
众所周知,微信小程序目前只能使用微信支付, 而且微信小程序支付相对于app支付,h5支付都要简单一些,但是该支付文档对java这语言是非常不友好的,居然没有demo, 网上虽说有很多博客,但是找了好多都是跑不通, 乱七八糟的很多都跑不通, 以下 代码不是自己写的,大多都是这儿抄一点哪儿抄一顿,但是能跑通,亲测没毛病,如果有毛病可以留言交流.废话不多说,先说准备工作!

1. 登录微信公众平台, 开通微信支付功能

这是准备工作的第一步, 确保小程序对应的支付功能已经开启

2. 登录微信商户平台

该步骤需要获取两个参数, 一个是商户号, 一个是支付秘钥, 如下图所示
imagepng

注意秘钥自己要保护好,相当于支付密码,每次签名都需要该参数, 该参数只能设置的时候看得见,其余的时候是没法看得见.所以要记好了!

3. 准备完毕, 小程序代码

微信小程序发起支付的请求到开发者服务器, 后台预下单返回一个prepay_id, 还有其他乱七八糟的参数.然后微信小程序调用支付方法进行支付, 最后微信服务器会发起回调函数到开发者服务器.

先贴一段微信的测试代码,微信统一下单必须要openId参数:

//index.js
//获取应用实例
var app = getApp()
Page({
  data: {
    motto: 'Hello World',
    userInfo: {}
  },
  onLoad: function () {
    console.log('onLoad')
    
  },
  //
  payoff: function(e){
    var that = this;
      console.log('zhixingle')
    wx.login({
      success: function(res) {
          wx.getUserInfo({
             
              success: function(re) {
                  that.getAddress(re,res.code);
              },
              fail: function () {
                  console.log('失败了')
              }
          })
      }
      
    });
    
  },
  // 获取用户的收货地址
    getAddress: function (re,code) {
      var that = this;
      wx.chooseAddress({
          success: function (add) {
              that.getOpenId(re, add.userName,add.provinceName,add.cityName,add.countyName,
              add.detailInfo,add.telNumber,code);
          }
      })
  },
  //获取openid
  getOpenId: function(re, userName, provinceName, cityName, countryName, detailInfo, telNumber,code){
    var that = this;
    wx.request({ 
        // 开发者服务器地址
        url: 'http://1d7a111.iok.la:10534/api/getUnionId', 
        method: 'POST',
        header: {
           'content-type': 'application/x-www-form-urlencoded'
        },
        data: { encryptedData: re.encryptedData, iv: re.iv, code: code },
        success: function(res) {
            var openId = res.data.userInfo.openId;
            var unionId = res.data.userInfo.unionId;
            // console.log('res>', openId);
            that.loginPlatform(userName, provinceName, cityName, countryName, detailInfo, telNumber,unionId, openId);
          
        }
    })
  },

  // 登录
    loginPlatform: function (userName, provinceName, cityName, countryName, detailInfo, telNumber,unionId, openId) {
        var that = this;
        wx.request({
            url: 'http://1d7a111.iok.la:12534/api/login/platform',
            method: 'POST',
            header: {
                'content-type': 'application/json'
            },
            data: { unionId: unionId, platform: 'WECHAT' },
            success: function(res) {
                console.log('res', res.data.token);
                var token = res.data.token;
                that.xiadan(userName, provinceName, cityName, countryName, detailInfo, telNumber,openId, token);
            }
        })
    },
  //下单
    xiadan: function (userName, provinceName, cityName, countryName, detailInfo, telNumber,openId, token){
    console.log('openId', openId);
    console.log('token', token);
    var that = this;
    wx.request({
        url: 'http://1d7a01111.iok.la:12534/api/v1/weixin/payment', 
        method: 'POST',
        header: {
            'content-type': 'application/json',
            'authorization': 'Bearer ' + token
        },
        data: {
            openId: openId,
            cfId: '5b32f553aff8ca411f839eb4', 
            planId: '5b32f5cbaff8ca111f839eb7',
            quantity: 2,
            orderRemark: '说点啥备注好?',
            name: userName,
            phone: telNumber,
            province: provinceName,
            city: cityName,
            district: countryName,
            address: detailInfo
        },
        success: function(res) {
            console.log('res>>>',res)
            that.requestPayment(res.data.data);
        }
    })
  },

  //申请支付
  requestPayment: function(obj){
      console.log('obj>>',obj)
    wx.requestPayment({
      'timeStamp': obj.timeStamp,
      'nonceStr': obj.nonceStr,
      'package': obj.package,
      'signType': obj.signType,
      'paySign': obj.paySign,
      'success':function(res){
      },
      'fail':function(res){
      }
    })
  }  
})

因为我这边需求是要获取微信用户的收货地址,然后unionId是登录获取token,openId是支付的必须参数,所以代码写的有点乱,不是专业的

4. 后端统一下单和支付回调接口


import com.thoughtworks.xstream.XStream;
import org.apache.log4j.Logger;
import org.dom4j.DocumentException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.Valid;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;

/**
 * @Author: YFei
 * @Date: Created in 18:10 2018/7/25
 * @Description:
 */
@RestController
@RequestMapping(value = "/api/v1")
public class WXAppletPayCtrl {
   
    private static final long serialVersionUID = 1L;
    private static final Logger L = Logger.getLogger(WXAppletPayCtrl.class);

    @Value("${wxapplet.config.weixinpay.notifyurl}")
    private String notify_url;
    //交易类型
    private final String trade_type = "JSAPI";
    //统一下单API接口链接
    private final String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";

    /**
     *
     * @param request
     * @return
     * @throws UnsupportedEncodingException
     * @throws DocumentException
     */
    @RequestMapping(
            value = "/weixin/payment",
            method = RequestMethod.POST
    )
    public Map payment(@Valid @RequestBody NewWXOrderRequest request, HttpServletRequest httpServletRequest) {
        Map map = new HashMap();
        String money = "10";
        String title = "商品名字";
       
        try {
            OrderInfo order = new OrderInfo();
            order.setAppid(Configure.getAppID());
            order.setMch_id(Configure.getMch_id());
            order.setNonce_str(RandomStringGenerator.getRandomStringByLength(32));
            order.setBody(title);
            order.setOut_trade_no(RandomStringGenerator.getRandomStringByLength(32));
            order.setTotal_fee(Integer.parseInt(money));     // 该金钱其实10 是 0.1元
            order.setSpbill_create_ip("127.0.0.1");
            order.setNotify_url(notify_url);
            order.setTrade_type(trade_type);
            order.setOpenid(request.getOpenId());
            order.setSign_type("MD5");
            //生成签名
            String sign = Signature.getSign(order);
            order.setSign(sign);

            String result = HttpRequest.sendPost(url, order);
            System.out.println(result);
            XStream xStream = new XStream();
            xStream.alias("xml", OrderReturnInfo.class);

            OrderReturnInfo returnInfo = (OrderReturnInfo)xStream.fromXML(result);
            // 二次签名
            if ("SUCCESS".equals(returnInfo.getReturn_code()) && returnInfo.getReturn_code().equals(returnInfo.getResult_code())) {
                SignInfo signInfo = new SignInfo();
                signInfo.setAppId(Configure.getAppID());
                long time = System.currentTimeMillis()/1000;
                signInfo.setTimeStamp(String.valueOf(time));
                signInfo.setNonceStr(RandomStringGenerator.getRandomStringByLength(32));
                signInfo.setRepay_id("prepay_id="+returnInfo.getPrepay_id());
                signInfo.setSignType("MD5");
                //生成签名
                String sign1 = Signature.getSign(signInfo);
                Map payInfo = new HashMap();
                payInfo.put("timeStamp", signInfo.getTimeStamp());
                payInfo.put("nonceStr", signInfo.getNonceStr());
                payInfo.put("package", signInfo.getRepay_id());
                payInfo.put("signType", signInfo.getSignType());
                payInfo.put("paySign", sign1);
                map.put("status", 200);
                map.put("msg", "统一下单成功!");
                map.put("data", payInfo);

                // 此处可以写唤起支付前的业务逻辑
                
                // 业务逻辑结束
                return map;
            }
            map.put("status", 500);
            map.put("msg", "统一下单失败!");
            map.put("data", null);
            return map;
        } catch (Exception e) {
            e.printStackTrace();
            L.error("-------", e);
        }
        return null;
    }

    /**
     * 微信小程序支付成功回调函数
     * @param request
     * @param response
     * @throws Exception
     */
    @RequestMapping(value = "/weixin/callback")
    public void wxNotify(HttpServletRequest request,HttpServletResponse response) throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream)request.getInputStream()));
        String line = null;
        StringBuilder sb = new StringBuilder();
        while((line = br.readLine()) != null){
            sb.append(line);
        }
        br.close();
        //sb为微信返回的xml
        String notityXml = sb.toString();
        String resXml = "";
        System.out.println("接收到的报文:" + notityXml);

        Map map = PayUtil.doXMLParse(notityXml);

        String returnCode = (String) map.get("return_code");
        if("SUCCESS".equals(returnCode)){
            //验证签名是否正确
            Map<String, String> validParams = PayUtil.paraFilter(map);  //回调验签时需要去除sign和空值参数
            String validStr = PayUtil.createLinkString(validParams);//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
            String sign = PayUtil.sign(validStr, Configure.getKey(), "utf-8").toUpperCase();//拼装生成服务器端验证的签名
            // 因为微信回调会有八次之多,所以当第一次回调成功了,那么我们就不再执行逻辑了
           
            //根据微信官网的介绍,此处不仅对回调的参数进行验签,还需要对返回的金额与系统订单的金额进行比对等
            if(sign.equals(map.get("sign"))){
                /**此处添加自己的业务逻辑代码start**/
                  // bla bla bla....
                /**此处添加自己的业务逻辑代码end**/
                //通知微信服务器已经支付成功
                resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
                        + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";
            } else {
                System.out.println("微信支付回调失败!签名不一致");
            }
        }else{
            resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
                    + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";
        }
        System.out.println(resXml);
        System.out.println("微信支付回调数据结束");

        BufferedOutputStream out = new BufferedOutputStream(
                response.getOutputStream());
        out.write(resXml.getBytes());
        out.flush();
        out.close();
    }

}

以上是统一下单的接口和微信支付成功的回调接口, 注意的如果springboot项目中的springsecurity,一定要注意放行回调地址, 否则回调会失败.

5. 相关配置类以及工具类

先上一下签名类:

import com.thoughtworks.xstream.annotations.XStreamAlias;
import org.apache.log4j.Logger;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Map;


/**
 * 签名
 * @author zuoliangzhu
 *
 */
public class Signature {
	private static final Logger L = Logger.getLogger(Signature.class);
	/**
     * 签名算法
     * @param o 要参与签名的数据对象
     * @return 签名
     * @throws IllegalAccessException
     */
    public static String getSign(Object o) throws IllegalAccessException {
        ArrayList<String> list = new ArrayList<String>();
        Class cls = o.getClass();
        Field[] fields = cls.getDeclaredFields();
        for (Field f : fields) {
            f.setAccessible(true);
            if (f.get(o) != null && f.get(o) != "") {
            	String name = f.getName();
            	XStreamAlias anno = f.getAnnotation(XStreamAlias.class);
            	if(anno != null)
            		name = anno.value();
                list.add(name + "=" + f.get(o) + "&");
            }
        }
        int size = list.size();
        String [] arrayToSort = list.toArray(new String[size]);
        Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i < size; i ++) {
            sb.append(arrayToSort[i]);
        }
        String result = sb.toString();
        result += "key=" + Configure.getKey();
        System.out.println("签名数据:"+result);
        result = MD5.MD5Encode(result).toUpperCase();
        return result;
    }

    public static String getSign(Map<String,Object> map){
        ArrayList<String> list = new ArrayList<String>();
        for(Map.Entry<String,Object> entry:map.entrySet()){
            if(entry.getValue()!=""){
                list.add(entry.getKey() + "=" + entry.getValue() + "&");
            }
        }
        int size = list.size();
        String [] arrayToSort = list.toArray(new String[size]);
        Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i < size; i ++) {
            sb.append(arrayToSort[i]);
        }
        String result = sb.toString();
        result += "key=" + Configure.getKey();
        //Util.log("Sign Before MD5:" + result);
        result = MD5.MD5Encode(result).toUpperCase();
        //Util.log("Sign Result:" + result);
        return result;
    }
}

然后配置类:

public class Configure {
    // 商户支付秘钥
	private static String key = "xxxxxxNOBVmszxxxxxxxxxxxxxxxxxxx";

	//小程序ID	
	private static String appID = "wx42ebbFFFFFFFFFF";
	//商户号
	private static String mch_id = "1499111112";
	// 小程序的secret
	private static String secret = "xxxxxxxxxxxxxxxxxxx";

	public static String getSecret() {
		return secret;
	}

	public static void setSecret(String secret) {
		Configure.secret = secret;
	}

	public static String getKey() {
		return key;
	}

	public static void setKey(String key) {
		Configure.key = key;
	}

	public static String getAppID() {
		return appID;
	}

	public static void setAppID(String appID) {
		Configure.appID = appID;
	}

	public static String getMch_id() {
		return mch_id;
	}

	public static void setMch_id(String mch_id) {
		Configure.mch_id = mch_id;
	}
}

然后工具类:

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
import com.thoughtworks.xstream.io.xml.XmlFriendlyNameCoder;
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.config.RequestConfig;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import javax.net.ssl.X509TrustManager;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;

public class HttpRequest {
	//连接超时时间,默认10秒
    private static final int socketTimeout = 10000;

    //传输超时时间,默认30秒
    private static final int connectTimeout = 30000;
	/**
	 * post请求
	 * @throws IOException 
	 * @throws ClientProtocolException 
	 * @throws NoSuchAlgorithmException 
	 * @throws KeyStoreException 
	 * @throws KeyManagementException 
	 * @throws UnrecoverableKeyException 
	 */
	public static String sendPost(String url, Object xmlObj) throws ClientProtocolException, IOException, UnrecoverableKeyException, KeyManagementException, KeyStoreException, NoSuchAlgorithmException {
		

        
		HttpPost httpPost = new HttpPost(url);
		//解决XStream对出现双下划线的bug
        XStream xStreamForRequestPostData = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));
        xStreamForRequestPostData.alias("xml", xmlObj.getClass());
        //将要提交给API的数据对象转换成XML格式数据Post给API
        String postDataXML = xStreamForRequestPostData.toXML(xmlObj);

        //得指明使用UTF-8编码,否则到API服务器XML的中文不能被成功识别
        StringEntity postEntity = new StringEntity(postDataXML, "UTF-8");
        httpPost.addHeader("Content-Type", "text/xml");
        httpPost.setEntity(postEntity);

        //设置请求器的配置
        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).build();
        httpPost.setConfig(requestConfig);
        
        HttpClient httpClient = HttpClients.createDefault();
        HttpResponse response = httpClient.execute(httpPost);
        HttpEntity entity = response.getEntity();
        String result = EntityUtils.toString(entity, "UTF-8");
        return result;
	}
	/**
	 * 自定义证书管理器,信任所有证书
	 * @author pc
	 *
	 */
	public static class MyX509TrustManager implements X509TrustManager {
		@Override
		public void checkClientTrusted(
				java.security.cert.X509Certificate[] arg0, String arg1)
				throws CertificateException {
			// TODO Auto-generated method stub

		}
		@Override
		public void checkServerTrusted(
				java.security.cert.X509Certificate[] arg0, String arg1)
				throws CertificateException {
			// TODO Auto-generated method stub
			
		}
		@Override
		public java.security.cert.X509Certificate[] getAcceptedIssuers() {
			// TODO Auto-generated method stub
			return null;
		}
      }
}

MD5加密工具:


import java.security.MessageDigest;

/**
 * User: rizenguo
 * Date: 2014/10/23
 * Time: 15:43
 */
public class MD5 {
    private final static String[] hexDigits = {"0", "1", "2", "3", "4", "5", "6", "7",
            "8", "9", "a", "b", "c", "d", "e", "f"};

    /**
     * 转换字节数组为16进制字串
     * @param b 字节数组
     * @return 16进制字串
     */
    public static String byteArrayToHexString(byte[] b) {
        StringBuilder resultSb = new StringBuilder();
        for (byte aB : b) {
            resultSb.append(byteToHexString(aB));
        }
        return resultSb.toString();
    }

    /**
     * 转换byte到16进制
     * @param b 要转换的byte
     * @return 16进制格式
     */
    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0) {
            n = 256 + n;
        }
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    /**
     * MD5编码
     * @param origin 原始字符串
     * @return 经过MD5加密之后的结果
     */
    public static String MD5Encode(String origin) {
        String resultString = null;
        try {
            resultString = origin;
            MessageDigest md = MessageDigest.getInstance("MD5");
            resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return resultString;
    }

}

预订单实体类:

package com.moyutang.common.utils.wxUtil;

/**
 * 预订单
 * 
 * @author zuoliangzhu
 *
 */

public class OrderInfo {
	private String appid;// 小程序ID	
	private String mch_id;// 商户号
	private String nonce_str;// 随机字符串
	private String sign_type;//签名类型
	private String sign;// 签名
	private String body;// 商品描述
	private String out_trade_no;// 商户订单号
	private int total_fee;// 标价金额 ,单位为分
	private String spbill_create_ip;// 终端IP
	private String notify_url;// 通知地址
	private String trade_type;// 交易类型
	private String openid;//用户标识	

	public String getSign_type() {
		return sign_type;
	}

	public void setSign_type(String sign_type) {
		this.sign_type = sign_type;
	}

	public String getOpenid() {
		return openid;
	}

	public void setOpenid(String openid) {
		this.openid = openid;
	}

	public String getAppid() {
		return appid;
	}

	public void setAppid(String appid) {
		this.appid = appid;
	}

	public String getMch_id() {
		return mch_id;
	}

	public void setMch_id(String mch_id) {
		this.mch_id = mch_id;
	}

	public String getNonce_str() {
		return nonce_str;
	}

	public void setNonce_str(String nonce_str) {
		this.nonce_str = nonce_str;
	}

	public String getSign() {
		return sign;
	}

	public void setSign(String sign) {
		this.sign = sign;
	}

	public String getBody() {
		return body;
	}

	public void setBody(String body) {
		this.body = body;
	}

	public String getOut_trade_no() {
		return out_trade_no;
	}

	public void setOut_trade_no(String out_trade_no) {
		this.out_trade_no = out_trade_no;
	}

	public int getTotal_fee() {
		return total_fee;
	}

	public void setTotal_fee(int total_fee) {
		this.total_fee = total_fee;
	}

	public String getSpbill_create_ip() {
		return spbill_create_ip;
	}

	public void setSpbill_create_ip(String spbill_create_ip) {
		this.spbill_create_ip = spbill_create_ip;
	}

	public String getNotify_url() {
		return notify_url;
	}

	public void setNotify_url(String notify_url) {
		this.notify_url = notify_url;
	}

	public String getTrade_type() {
		return trade_type;
	}

	public void setTrade_type(String trade_type) {
		this.trade_type = trade_type;
	}
}

订单返回消息实体类

package com.xxxx.common.utils.wxUtil;

public class OrderReturnInfo {
    private String return_code;
    private String return_msg;
    private String result_code;
    private String appid;
    private String mch_id;
    private String nonce_str;
    private String sign;
    private String prepay_id;
    private String trade_type;
	public String getReturn_code() {
		return return_code;
	}
	public void setReturn_code(String return_code) {
		this.return_code = return_code;
	}
	public String getReturn_msg() {
		return return_msg;
	}
	public void setReturn_msg(String return_msg) {
		this.return_msg = return_msg;
	}
	public String getResult_code() {
		return result_code;
	}
	public void setResult_code(String result_code) {
		this.result_code = result_code;
	}
	public String getAppid() {
		return appid;
	}
	public void setAppid(String appid) {
		this.appid = appid;
	}
	public String getMch_id() {
		return mch_id;
	}
	public void setMch_id(String mch_id) {
		this.mch_id = mch_id;
	}
	public String getNonce_str() {
		return nonce_str;
	}
	public void setNonce_str(String nonce_str) {
		this.nonce_str = nonce_str;
	}
	public String getSign() {
		return sign;
	}
	public void setSign(String sign) {
		this.sign = sign;
	}
	public String getPrepay_id() {
		return prepay_id;
	}
	public void setPrepay_id(String prepay_id) {
		this.prepay_id = prepay_id;
	}
	public String getTrade_type() {
		return trade_type;
	}
	public void setTrade_type(String trade_type) {
		this.trade_type = trade_type;
	}
}

随机数生成工具类:

import java.util.Random;

/**
 * 随机字符串生成
 * @author zuoliangzhu
 *
 */
public class RandomStringGenerator {
	/**
     * 获取一定长度的随机字符串
     * @param length 指定字符串长度
     * @return 一定长度的字符串
     */
    public static String getRandomStringByLength(int length) {
        String base = "abcdefghijklmnopqrstuvwxyz0123456789";
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(base.length());
            sb.append(base.charAt(number));
        }
        return sb.toString();
    }
}

签名实体类:


import com.thoughtworks.xstream.annotations.XStreamAlias;

/**
 * 签名信息
 * @author zuoliangzhu
 *
 */
public class SignInfo {

	private String appId;//小程序ID	
	private String timeStamp;//时间戳	
	private String nonceStr;//随机串	
	@XStreamAlias("package")
	private String repay_id;
	private String signType;//签名方式
	
	public String getAppId() {
		return appId;
	}
	public void setAppId(String appId) {
		this.appId = appId;
	}
	public String getTimeStamp() {
		return timeStamp;
	}
	public void setTimeStamp(String timeStamp) {
		this.timeStamp = timeStamp;
	}
	public String getNonceStr() {
		return nonceStr;
	}
	public void setNonceStr(String nonceStr) {
		this.nonceStr = nonceStr;
	}
	public String getRepay_id() {
		return repay_id;
	}
	public void setRepay_id(String repay_id) {
		this.repay_id = repay_id;
	}
	public String getSignType() {
		return signType;
	}
	public void setSignType(String signType) {
		this.signType = signType;
	}
}

最后有一些乱七八糟的配置文件:

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
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.security.SignatureException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.codec.digest.DigestUtils;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;

public class PayUtil {
    /**
     * 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.md5Hex(getContentBytes(text, input_charset));
    }
    /**
     * 签名字符串
     *  @param text 需要签名的字符串
     * @param sign 签名结果
     * @param key 密钥
     * @param input_charset 编码格式
     * @return 签名结果
     */
    public static boolean verify(String text, String sign, String key, String input_charset) {
        text = text + key;
        String mysign = DigestUtils.md5Hex(getContentBytes(text, input_charset));
        if (mysign.equals(sign)) {
            return true;
        } else {
            return false;
        }
    }
    /**
     * @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);
        }
    }

    private static boolean isValidChar(char ch) {
        if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z'))
            return true;
        if ((ch >= 0x4e00 && ch <= 0x7fff) || (ch >= 0x8000 && ch <= 0x952f))
            return true;// 简体中文汉字编码
        return false;
    }
    /**
     * 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;
    }
    /**
     *
     * @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SSLContext
        StringBuffer 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();
    }
    public static String urlEncodeUTF8(String source){
        String result=source;
        try {
            result=java.net.URLEncoder.encode(source, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return result;
    }
    /**
     * 解析xml,返回第一级元素键值对。如果第一级元素有子节点,则此节点的值是子节点的xml数据。
     * @param strxml
     * @return
     * @throws JDOMException
     * @throws IOException
     */
    public static Map doXMLParse(String strxml) throws Exception {
        if(null == strxml || "".equals(strxml)) {
            return null;
        }

        Map m = new HashMap();
        InputStream in = String2Inputstream(strxml);
        SAXBuilder builder = new SAXBuilder();
        Document doc = builder.build(in);
        Element root = doc.getRootElement();
        List list = root.getChildren();
        Iterator it = list.iterator();
        while(it.hasNext()) {
            Element e = (Element) it.next();
            String k = e.getName();
            String v = "";
            List children = e.getChildren();
            if(children.isEmpty()) {
                v = e.getTextNormalize();
            } else {
                v = getChildrenText(children);
            }

            m.put(k, v);
        }

        //关闭流
        in.close();

        return m;
    }
    /**
     * 获取子结点的xml
     * @param children
     * @return String
     */
    public static String getChildrenText(List children) {
        StringBuffer sb = new StringBuffer();
        if(!children.isEmpty()) {
            Iterator it = children.iterator();
            while(it.hasNext()) {
                Element e = (Element) it.next();
                String name = e.getName();
                String value = e.getTextNormalize();
                List list = e.getChildren();
                sb.append("<" + name + ">");
                if(!list.isEmpty()) {
                    sb.append(getChildrenText(list));
                }
                sb.append(value);
                sb.append("</" + name + ">");
            }
        }

        return sb.toString();
    }
    public static InputStream String2Inputstream(String str) {
        return new ByteArrayInputStream(str.getBytes());
    }
}

好了,就这些了,应该没漏了.. 抄了不少朋友的代码,大同小异

6. 最后还有些jar包说明一下

这里使用gradle管理jar包, 如果是maven自行转换

    // https://mvnrepository.com/artifact/org.codehaus.xfire/xfire-core
	compile group: 'org.codehaus.xfire', name: 'xfire-core', version: '1.2.6'
	// https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk16
	compile group: 'org.bouncycastle', name: 'bcprov-jdk16', version: '1.46'
	// https://mvnrepository.com/artifact/com.thoughtworks.xstream/xstream
	compile group: 'com.thoughtworks.xstream', name: 'xstream', version: '1.4.7'
	// https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient
	compile group: 'org.apache.httpcomponents', name: 'httpclient', version: '4.5.2'
    compile 'org.jdom:jdom2:2.0.5'
    //	compile("org.springframework.boot:spring-boot-starter-undertow")
	compile('org.springframework.boot:spring-boot-starter-security')

另外还有application.yml文件里面说明一下, 有一个回调地址

wxapplet.config.weixinpay.notifyurl: http://localhost:8080/api/v1/weixin/wxappletpaycallback

有很多网友在问NewWXOrderRequest是个什么类, 这里我们可以看一下代码, 这个类值是一个封装了openId的类, 其实在实际项目中不单单封装openId,还有一些其他的业务参数, 这个业务参数按照实际需要来, 我这里封装了一大堆, 包括用户的收货地址等信息.. 其中@data是lombok插件, 如果有写get/set方法该注释可以省略!

@Data
public class NewWXOrderRequest {
 
  @NotNull
  @Min(value = 1)
  private Integer quantity; // 货物数量
  @NotNull
  private String openId; // 小程序的用户openId

  private String orderRemark; // 订单备注留言

  // 地址
  private String name; // 收货人姓名
  private String phone; // 收货人联系方式
  private String province; // 省份
  private String city; // 城市
  private String district; // 区
  private String address; // 详细地址
}

validate