一、对接微信支付流程：
时序图：
流程解析：
1、用户端申请微信支付
2、后端开始调用微信支付接口
3、微信平台返回支付交易标识
4、后端对支付交易标识进行签名（非必须，看项目）并回传给前端
5、前端用户确认支付（输入密码等操作），直接调用微信平台接口进行支付确认
6、微信平台返回支付状态给前端和后端
二、后端接口分析：
从上述流程分析，对接微信支付，后端有两个关键接口，第一是获取微信平台支付标识接口，第二是由微信平台传递支付状态的回调接口
接口1：
/** * 订单支付 * * @param ordersPaymentDTO * @return */
public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
// 当前登录用户id
Long userId = BaseContext.getCurrentId();
User user = userMapper.getById(userId);
//调用微信支付接口，生成预支付交易单
JSONObject jsonObject = weChatPayUtil.pay(
ordersPaymentDTO.getOrderNumber(), //商户订单号
new BigDecimal(0.01), //支付金额，单位 元
"订单藐视", //商品描述
user.getOpenid() //微信用户的openid );
if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
throw new OrderBusinessException("该订单已支付");
}
OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
vo.setPackageStr(jsonObject.getString("package"));
return vo;
}接口2：
/** * 支付成功，修改订单状态 * * @param outTradeNo */
public void paySuccess(String outTradeNo) {
// 当前登录用户id
Long userId = BaseContext.getCurrentId();
// 根据订单号查询当前用户的订单
Orders ordersDB = orderMapper.getByNumberAndUserId(outTradeNo, userId);
// 根据订单id更新订单的状态、支付方式、支付状态、结账时间
Orders orders = Orders.builder()
.id(ordersDB.getId())
.status(Orders.TO_BE_CONFIRMED)
.payStatus(Orders.PAID)
.checkoutTime(LocalDateTime.now())
.build();
orderMapper.update(orders);工具类：
package com.sky.utils;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.properties.WeChatProperties;
import com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder;
import com.wechat.pay.contrib.apache.httpclient.util.PemUtil;
import org.apache.commons.lang.RandomStringUtils;
import org.apache.http.HttpHeaders;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.util.EntityUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.math.BigDecimal;
import java.security.PrivateKey;
import java.security.Signature;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Base64;
import java.util.List;
/** * 微信支付工具类 */@Componentpublic class WeChatPayUtil {
//微信支付下单接口地址
public static final String JSAPI = "https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi";
//申请退款接口地址
public static final String REFUNDS = "https://api.mch.weixin.qq.com/v3/refund/domestic/refunds";
@Autowired
private WeChatProperties weChatProperties;
/** * 获取调用微信接口的客户端工具对象 * * @return */
private CloseableHttpClient getClient() {
PrivateKey merchantPrivateKey = null;
try {
//merchantPrivateKey商户API私钥，如何加载商户API私钥请看常见问题
merchantPrivateKey = PemUtil.loadPrivateKey(new FileInputStream(new File(weChatProperties.getPrivateKeyFilePath())));
//加载平台证书文件
X509Certificate x509Certificate = PemUtil.loadCertificate(new FileInputStream(new File(weChatProperties.getWeChatPayCertFilePath())));
//wechatPayCertificates微信支付平台证书列表。你也可以使用后面章节提到的“定时更新平台证书功能”，而不需要关心平台证书的来龙去脉
List<X509Certificate> wechatPayCertificates = Arrays.asList(x509Certificate);
WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create()
.withMerchant(weChatProperties.getMchid(), weChatProperties.getMchSerialNo(), merchantPrivateKey)
.withWechatPay(wechatPayCertificates);
// 通过WechatPayHttpClientBuilder构造的HttpClient，会自动的处理签名和验签
CloseableHttpClient httpClient = builder.build();
return httpClient;
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
}
}
/** * 发送post方式请求 * * @param url * @param body * @return */
private String post(String url, String body) throws Exception {
CloseableHttpClient httpClient = getClient();
HttpPost httpPost = new HttpPost(url);
httpPost.addHeader(HttpHeaders.ACCEPT, ContentType.APPLICATION_JSON.toString());
httpPost.addHeader(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString());
httpPost.addHeader("Wechatpay-Serial", weChatProperties.getMchSerialNo());
httpPost.setEntity(new StringEntity(body, "UTF-8"));
CloseableHttpResponse response = httpClient.execute(httpPost);
try {
String bodyAsString = EntityUtils.toString(response.getEntity());
return bodyAsString;
} finally {
httpClient.close();
response.close();
}
}
/** * 发送get方式请求 * * @param url * @return */
private String get(String url) throws Exception {
CloseableHttpClient httpClient = getClient();
HttpGet httpGet = new HttpGet(url);
httpGet.addHeader(HttpHeaders.ACCEPT, ContentType.APPLICATION_JSON.toString());
httpGet.addHeader(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString());
httpGet.addHeader("Wechatpay-Serial", weChatProperties.getMchSerialNo());
CloseableHttpResponse response = httpClient.execute(httpGet);
try {
String bodyAsString = EntityUtils.toString(response.getEntity());
return bodyAsString;
} finally {
httpClient.close();
response.close();
}
}
/** * jsapi下单 * * @param orderNum 商户订单号 * @param total 总金额 * @param description 商品描述 * @param openid 微信用户的openid * @return */ private String jsapi(String orderNum, BigDecimal total, String description, String openid) throws Exception {
JSONObject jsonObject = new JSONObject();
jsonObject.put("appid", weChatProperties.getAppid());
jsonObject.put("mchid", weChatProperties.getMchid());
jsonObject.put("description", description);
jsonObject.put("out_trade_no", orderNum);
jsonObject.put("notify_url", weChatProperties.getNotifyUrl());
JSONObject amount = new JSONObject();
amount.put("total", total.multiply(new BigDecimal(100)).setScale(2, BigDecimal.ROUND_HALF_UP).intValue());
amount.put("currency", "CNY");
jsonObject.put("amount", amount);
JSONObject payer = new JSONObject();
payer.put("openid", openid);
jsonObject.put("payer", payer);
String body = jsonObject.toJSONString();
return post(JSAPI, body);
}
/** * 小程序支付 * * @param orderNum 商户订单号 * @param total 金额，单位 元 * @param description 商品描述 * @param openid 微信用户的openid * @return */ public JSONObject pay(String orderNum, BigDecimal total, String description, String openid) throws Exception {
//统一下单，生成预支付交易单
String bodyAsString = jsapi(orderNum, total, description, openid);
//解析返回结果
JSONObject jsonObject = JSON.parseObject(bodyAsString);
System.out.println(jsonObject);
String prepayId = jsonObject.getString("prepay_id");
if (prepayId != null) {
String timeStamp = String.valueOf(System.currentTimeMillis() / 1000);
String nonceStr = RandomStringUtils.randomNumeric(32);
ArrayList<Object> list = new ArrayList<>();
list.add(weChatProperties.getAppid());
list.add(timeStamp);
list.add(nonceStr);
list.add("prepay_id=" + prepayId);
//二次签名，调起支付需要重新签名
StringBuilder stringBuilder = new StringBuilder();
for (Object o : list) {
stringBuilder.append(o).append("\n");
}
String signMessage = stringBuilder.toString();
byte[] message = signMessage.getBytes();
Signature signature = Signature.getInstance("SHA256withRSA");
signature.initSign(PemUtil.loadPrivateKey(new FileInputStream(new File(weChatProperties.getPrivateKeyFilePath()))));
signature.update(message);
String packageSign = Base64.getEncoder().encodeToString(signature.sign());
//构造数据给微信小程序，用于调起微信支付
JSONObject jo = new JSONObject();
jo.put("timeStamp", timeStamp);
jo.put("nonceStr", nonceStr);
jo.put("package", "prepay_id=" + prepayId);
jo.put("signType", "RSA");
jo.put("paySign", packageSign);
return jo;
}
return jsonObject;
}
/** * 申请退款 * * @param outTradeNo 商户订单号 * @param outRefundNo 商户退款单号 * @param refund 退款金额 * @param total 原订单金额 * @return */ public String refund(String outTradeNo, String outRefundNo, BigDecimal refund, BigDecimal total) throws Exception {
JSONObject jsonObject = new JSONObject();
jsonObject.put("out_trade_no", outTradeNo);
jsonObject.put("out_refund_no", outRefundNo);
JSONObject amount = new JSONObject();
amount.put("refund", refund.multiply(new BigDecimal(100)).setScale(2, BigDecimal.ROUND_HALF_UP).intValue());
amount.put("total", total.multiply(new BigDecimal(100)).setScale(2, BigDecimal.ROUND_HALF_UP).intValue());
amount.put("currency", "CNY");
jsonObject.put("amount", amount);
jsonObject.put("notify_url", weChatProperties.getRefundNotifyUrl());
String body = jsonObject.toJSONString();
//调用申请退款接口
return post(REFUNDS, body);
}
}
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