废话不多说，直接上代码，微信的小程序，公众号支付都大差不差，自行看文档修改参数即可。

maven依赖：

com.github.wxpay

wxpay-sdk

0.0.3

application.yml中配置微信相关参数：

wx:

app:

appId: wxdee12345681703e8

mchId: 1512345671

key: 86799C8812345675C82F3FE33FFE7EE3

notifyUrl: https://test.shuai.com/wxPayCallback

引入wxpay依赖后需要实现里面的微信配置类，将上面的微信相关的信息写进去：

package com.bcn.yeyks.apppay.service.impl;

import com.github.wxpay.sdk.WXPayConfig;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.stereotype.Service;

import java.io.InputStream;

/**

* @Author fuchangshuai

* @date 2019/3/13 5:29 PM

*/

@Service

public class WXPayConfigImpl implements WXPayConfig {

@Value("${wx.app.appId}")

String appID;

@Value("${wx.app.key}")

String key;

@Value("${wx.app.mchId}")

String mchID;

@Override

public String getAppID()

{

return appID;

}

@Override

public String getMchID()

{

return mchID;

}

@Override

public String getKey()

{

return key;

}

@Override

public InputStream getCertStream()

{

return this.getClass().getResourceAsStream("/apiclient_cert.p12");

}

@Override

public int getHttpConnectTimeoutMs()

{

return 2000;

}

@Override

public int getHttpReadTimeoutMs()

{

return 10000;

}

}

微信支付类：

package com.bcn.yeyks.apppay.service.impl;

import com.alibaba.fastjson.JSON;

import com.bcn.yeyks.apppay.service.WXAppPayService;

import com.bcn.yeyks.exception.ServiceException;

import com.bcn.yeyks.model.RefundRequestNo;

import com.github.wxpay.sdk.WXPay;

import com.github.wxpay.sdk.WXPayConfig;

import com.github.wxpay.sdk.WXPayUtil;

import lombok.extern.slf4j.Slf4j;

import org.apache.commons.codec.digest.DigestUtils;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.stereotype.Service;

import java.util.Arrays;

import java.util.LinkedHashMap;

import java.util.Map;

/**

* @Author fuchangshuai

* @date 2019/3/4 2:34 PM

*/

@Service

@Slf4j

public class WXAppPayServiceImpl implements WXAppPayService {

@Autowired

private WXPayConfig wxPayConfig;

@Value("${wx.app.key}")

String key;

@Value("${wx.app.notifyUrl}")

String notify_url;

@Value("${wx.app.vipNotifyUrl}")

String vip_notify_url;

@Value("${wx.app.appId}")

String appId;

@Value("${wx.app.mchId}")

String mch_id;

@Override

public String pay(Integer totalFee, String orderNo, String ip) {

log.info("微信app支付");

Mapmap = wxPay(orderNo, totalFee, ip);

return JSON.toJSONString(map);

}

@Override

public Boolean refund(Integer refundFee, Integer totalFee, String orderNo) {

log.info("微信退款");

return wxRefund(refundFee, totalFee, orderNo);

}

private MapwxPay(String orderNO, Integer payAmount, String ip) {

try {

Mapmap = new LinkedHashMap<>();

String body = "订单支付";

String nonce_str = WXPayUtil.generateNonceStr();

String total_fee = String.valueOf(payAmount);

map.put("body", body);

map.put("nonce_str", nonce_str);

map.put("out_trade_no", orderNO);

map.put("total_fee", total_fee);

map.put("spbill_create_ip", ip);

map.put("notify_url", notify_url);

map.put("trade_type", "APP");

WXPay pay = new WXPay(wxPayConfig);

MapreturnMap = pay.unifiedOrder(map);

MapresultMap = new LinkedHashMap<>();

resultMap.put("appid", appId);

resultMap.put("noncestr", nonce_str);

resultMap.put("package", "Sign=WXPay");

resultMap.put("partnerid", mch_id);

resultMap.put("prepayid", returnMap.get("prepay_id"));

resultMap.put("timestamp", System.currentTimeMillis() / 1000 + "");

StringBuilder result = new StringBuilder();

for (Map.Entryentry : resultMap.entrySet()) {

result.append(entry.getKey()).append("=").append(entry.getValue()).append("&");

}

result.append("key=").append(key);

resultMap.put("sign", DigestUtils.md5Hex(result.toString()).toUpperCase());

return resultMap;

} catch (Exception e) {

log.info("微信支付失败{}", Arrays.toString(e.getStackTrace()));

throw new ServiceException("微信支付异常");

}

}

private Boolean wxRefund(Integer refundFee, Integer totalFee, String orderNo) {

try {

String outRequestNo = orderNo + RefundRequestNo.outNo;

String refundAmount = String.valueOf(refundFee);

String totalAmount = String.valueOf(totalFee);

Mapmap = new LinkedHashMap<>();

String nonce_str = WXPayUtil.generateNonceStr();

map.put("nonce_str", nonce_str);

map.put("out_trade_no", orderNo);

map.put("out_refund_no", outRequestNo);

map.put("total_fee", totalAmount);

map.put("refund_fee", refundAmount);

WXPay pay = new WXPay(wxPayConfig);

MapresutlMap = pay.refund(map);

String resultCode = resutlMap.get("result_code") == null ? "FAIL" : resutlMap.get("result_code");

String resultRefundFee = resutlMap.get("refund_fee") == null ? "FAIL" : resutlMap.get("refund_fee");

if ("SUCCESS".equals(resultCode) && resultRefundFee.equals(refundAmount)) {

return true;

}

} catch (Exception e) {

log.info("微信退款失败{}", Arrays.toString(e.getStackTrace()));

return false;

}

return false;

}

}

微信支付返回的回调类：

package com.bcn.yeyks.apppay.controller;

import com.bcn.yeyks.dal.domain.OrderInfo;

import com.bcn.yeyks.dal.domain.VipOrder;

import com.bcn.yeyks.exception.ServiceException;

import com.bcn.yeyks.service.OrderService;

import com.bcn.yeyks.service.VipOrderService;

import com.bcn.yeyks.wxpay.WXPayUtil;

import lombok.extern.slf4j.Slf4j;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;

import java.io.*;

import java.util.*;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

/**

* @Author fuchangshuai

* @date 2019/3/11 1:48 PM

*/

@RestController

@Slf4j

public class WxPayCallbackController {

@Autowired

private OrderService orderService;

@Autowired

private VipOrderService vipOrderService;

private ExecutorService executorService = Executors.newFixedThreadPool(20);

@RequestMapping(value = "/wxPayCallback", method = RequestMethod.POST)

public String wxPayCallback(HttpServletRequest request) {

log.info("微信支付回调");

try {

// 读取参数

// 解析xml成map

Mapmap = WXPayUtil.xmlToMap(getParam(request));

log.info("微信支付回调返回的信息{}", map);

check(map);//该处读者自行校验(验证订单号，付款金额等是否正确)

String orderNo = map.get("out_trade_no");

String resultCode = map.get("result_code");

// 另起线程处理业务

log.info("另起线程处理业务");

executorService.execute(() -> {

// 支付成功

if (resultCode.equals("SUCCESS")) {

log.info("支付成功");

// TODO 自己的业务逻辑

} else {

log.info("支付失败");

// TODO 自己的业务逻辑

}

});

if (resultCode.equals("SUCCESS")) {

return setXml("SUCCESS", "OK");

} else {

return setXml("fail", "付款失败");

}

} catch (ServiceException e) {

log.info("微信支付回调发生异常{}", e.getMessage());

return setXml("fail", "付款失败");

} catch (Exception e) {

log.info("微信支付回调发生异常{}", e.getLocalizedMessage());

return setXml("fail", "付款失败");

}

}

private String getParam(HttpServletRequest request) throws IOException {

// 读取参数

InputStream inputStream;

StringBuilder sb = new StringBuilder();

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();

return sb.toString();

}

private void check(Mapparams) throws ServiceException {

String outTradeNo = params.get("out_trade_no");

// 1、商户需要验证该通知数据中的out_trade_no是否为商户系统中创建的订单号，

OrderInfo order = orderService.selectOrderByOrderNo(outTradeNo);

if (order == null) {

throw new ServiceException("out_trade_no错误");

}

// 2、判断total_amount是否确实为该订单的实际金额(即商户订单创建时的金额)，

Integer totalAmount = Integer.valueOf(params.get("total_fee"));

log.info("totalAmount{}", totalAmount);

if (!totalAmount.equals(order.getSnapshotTotalFee())) {

throw new ServiceException("total_amount错误");

}

}

// 通过xml发给微信消息

private static String setXml(String return_code, String return_msg) {

SortedMapparameters = new TreeMap<>();

parameters.put("return_code", return_code);

parameters.put("return_msg", return_msg);

try {

return WXPayUtil.mapToXml(parameters);

} catch (Exception e) {

log.error("返回微信消息时map转xml失败");

return "" + "";

}

}

}

到这里微信支付已经完成，按照上面的步骤，完全可以实现微信的app支付，下一篇将介绍支付宝的app支付