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+package com.sky.utils;
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+
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+import com.alibaba.fastjson.JSON;
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+import com.alibaba.fastjson.JSONObject;
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+import com.sky.properties.WeChatProperties;
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+import com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder;
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+import com.wechat.pay.contrib.apache.httpclient.util.PemUtil;
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+import org.apache.commons.lang.RandomStringUtils;
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+import org.apache.http.HttpHeaders;
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+import org.apache.http.client.methods.CloseableHttpResponse;
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+import org.apache.http.client.methods.HttpGet;
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+import org.apache.http.client.methods.HttpPost;
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+import org.apache.http.entity.ContentType;
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+import org.apache.http.entity.StringEntity;
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+import org.apache.http.impl.client.CloseableHttpClient;
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+import org.apache.http.util.EntityUtils;
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+import org.springframework.beans.factory.annotation.Autowired;
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+import org.springframework.stereotype.Component;
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+
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+import java.io.File;
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+import java.io.FileInputStream;
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+import java.io.FileNotFoundException;
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+import java.math.BigDecimal;
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+import java.security.PrivateKey;
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+import java.security.Signature;
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+import java.security.cert.X509Certificate;
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+import java.util.ArrayList;
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+import java.util.Arrays;
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+import java.util.Base64;
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+import java.util.List;
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+
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+/**
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+ * 微信支付工具类
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+ */
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+@Component
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+public class WeChatPayUtil {
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+
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+ //微信支付下单接口地址
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+ public static final String JSAPI = "https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi";
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+
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+ //申请退款接口地址
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+ public static final String REFUNDS = "https://api.mch.weixin.qq.com/v3/refund/domestic/refunds";
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+
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+ @Autowired
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+ private WeChatProperties weChatProperties;
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+
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+ /**
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+ * 获取调用微信接口的客户端工具对象
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+ *
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+ * @return
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+ */
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+ private CloseableHttpClient getClient() {
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+ PrivateKey merchantPrivateKey = null;
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+ try {
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+ //merchantPrivateKey商户API私钥,如何加载商户API私钥请看常见问题
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+ merchantPrivateKey = PemUtil.loadPrivateKey(new FileInputStream(new File(weChatProperties.getPrivateKeyFilePath())));
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+ //加载平台证书文件
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+ X509Certificate x509Certificate = PemUtil.loadCertificate(new FileInputStream(new File(weChatProperties.getWeChatPayCertFilePath())));
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+ //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
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+ List<X509Certificate> wechatPayCertificates = Arrays.asList(x509Certificate);
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+
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+ WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create()
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+ .withMerchant(weChatProperties.getMchid(), weChatProperties.getMchSerialNo(), merchantPrivateKey)
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+ .withWechatPay(wechatPayCertificates);
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+
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+ // 通过WechatPayHttpClientBuilder构造的HttpClient,会自动的处理签名和验签
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+ CloseableHttpClient httpClient = builder.build();
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+ return httpClient;
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+ } catch (FileNotFoundException e) {
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+ e.printStackTrace();
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+ return null;
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+ }
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+ }
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+
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+ /**
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+ * 发送post方式请求
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+ *
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+ * @param url
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+ * @param body
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+ * @return
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+ */
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+ private String post(String url, String body) throws Exception {
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+ CloseableHttpClient httpClient = getClient();
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+
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+ HttpPost httpPost = new HttpPost(url);
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+ httpPost.addHeader(HttpHeaders.ACCEPT, ContentType.APPLICATION_JSON.toString());
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+ httpPost.addHeader(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString());
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+ httpPost.addHeader("Wechatpay-Serial", weChatProperties.getMchSerialNo());
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+ httpPost.setEntity(new StringEntity(body, "UTF-8"));
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+
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+ CloseableHttpResponse response = httpClient.execute(httpPost);
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+ try {
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+ String bodyAsString = EntityUtils.toString(response.getEntity());
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+ return bodyAsString;
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+ } finally {
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+ httpClient.close();
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+ response.close();
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+ }
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+ }
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+
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+ /**
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+ * 发送get方式请求
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+ *
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+ * @param url
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+ * @return
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+ */
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+ private String get(String url) throws Exception {
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+ CloseableHttpClient httpClient = getClient();
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+
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+ HttpGet httpGet = new HttpGet(url);
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+ httpGet.addHeader(HttpHeaders.ACCEPT, ContentType.APPLICATION_JSON.toString());
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+ httpGet.addHeader(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString());
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+ httpGet.addHeader("Wechatpay-Serial", weChatProperties.getMchSerialNo());
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+
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+ CloseableHttpResponse response = httpClient.execute(httpGet);
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+ try {
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+ String bodyAsString = EntityUtils.toString(response.getEntity());
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+ return bodyAsString;
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+ } finally {
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+ httpClient.close();
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+ response.close();
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+ }
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+ }
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+
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+ /**
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+ * jsapi下单
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+ *
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+ * @param orderNum 商户订单号
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+ * @param total 总金额
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+ * @param description 商品描述
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+ * @param openid 微信用户的openid
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+ * @return
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+ */
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+ private String jsapi(String orderNum, BigDecimal total, String description, String openid) throws Exception {
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+ JSONObject jsonObject = new JSONObject();
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+ jsonObject.put("appid", weChatProperties.getAppid());
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+ jsonObject.put("mchid", weChatProperties.getMchid());
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+ jsonObject.put("description", description);
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+ jsonObject.put("out_trade_no", orderNum);
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+ jsonObject.put("notify_url", weChatProperties.getNotifyUrl());
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+
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+ JSONObject amount = new JSONObject();
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+ amount.put("total", total.multiply(new BigDecimal(100)).setScale(2, BigDecimal.ROUND_HALF_UP).intValue());
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+ amount.put("currency", "CNY");
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+
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+ jsonObject.put("amount", amount);
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+
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+ JSONObject payer = new JSONObject();
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+ payer.put("openid", openid);
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+
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+ jsonObject.put("payer", payer);
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+
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+ String body = jsonObject.toJSONString();
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+ return post(JSAPI, body);
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+ }
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+
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+ /**
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+ * 小程序支付
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+ *
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+ * @param orderNum 商户订单号
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+ * @param total 金额,单位 元
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+ * @param description 商品描述
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+ * @param openid 微信用户的openid
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+ * @return
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+ */
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+ public JSONObject pay(String orderNum, BigDecimal total, String description, String openid) throws Exception {
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+ //统一下单,生成预支付交易单
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+ String bodyAsString = jsapi(orderNum, total, description, openid);
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+ //解析返回结果
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+ JSONObject jsonObject = JSON.parseObject(bodyAsString);
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+ System.out.println(jsonObject);
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+
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+ String prepayId = jsonObject.getString("prepay_id");
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+ if (prepayId != null) {
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+ String timeStamp = String.valueOf(System.currentTimeMillis() / 1000);
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+ String nonceStr = RandomStringUtils.randomNumeric(32);
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+ ArrayList<Object> list = new ArrayList<>();
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+ list.add(weChatProperties.getAppid());
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+ list.add(timeStamp);
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+ list.add(nonceStr);
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+ list.add("prepay_id=" + prepayId);
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+ //二次签名,调起支付需要重新签名
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+ StringBuilder stringBuilder = new StringBuilder();
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+ for (Object o : list) {
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+ stringBuilder.append(o).append("\n");
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+ }
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+ String signMessage = stringBuilder.toString();
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+ byte[] message = signMessage.getBytes();
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+
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+ Signature signature = Signature.getInstance("SHA256withRSA");
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+ signature.initSign(PemUtil.loadPrivateKey(new FileInputStream(new File(weChatProperties.getPrivateKeyFilePath()))));
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+ signature.update(message);
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+ String packageSign = Base64.getEncoder().encodeToString(signature.sign());
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+
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+ //构造数据给微信小程序,用于调起微信支付
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+ JSONObject jo = new JSONObject();
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+ jo.put("timeStamp", timeStamp);
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+ jo.put("nonceStr", nonceStr);
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+ jo.put("package", "prepay_id=" + prepayId);
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+ jo.put("signType", "RSA");
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+ jo.put("paySign", packageSign);
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+
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+ return jo;
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+ }
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+ return jsonObject;
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+ }
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+
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+ /**
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+ * 申请退款
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+ *
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+ * @param outTradeNo 商户订单号
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+ * @param outRefundNo 商户退款单号
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+ * @param refund 退款金额
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+ * @param total 原订单金额
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+ * @return
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+ */
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+ public String refund(String outTradeNo, String outRefundNo, BigDecimal refund, BigDecimal total) throws Exception {
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+ JSONObject jsonObject = new JSONObject();
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+ jsonObject.put("out_trade_no", outTradeNo);
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+ jsonObject.put("out_refund_no", outRefundNo);
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+
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+ JSONObject amount = new JSONObject();
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+ amount.put("refund", refund.multiply(new BigDecimal(100)).setScale(2, BigDecimal.ROUND_HALF_UP).intValue());
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+ amount.put("total", total.multiply(new BigDecimal(100)).setScale(2, BigDecimal.ROUND_HALF_UP).intValue());
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+ amount.put("currency", "CNY");
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+
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+ jsonObject.put("amount", amount);
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+ jsonObject.put("notify_url", weChatProperties.getRefundNotifyUrl());
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+
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+ String body = jsonObject.toJSONString();
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+
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+ //调用申请退款接口
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+ return post(REFUNDS, body);
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+ }
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+}
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