content: package com.alibaba.langengine.alipay.service;
  
  import com.alibaba.fastjson.JSON;
  import com.alibaba.langengine.alipay.AlipayConfiguration;
  import com.alibaba.langengine.alipay.model.*;
  import lombok.extern.slf4j.Slf4j;
  import okhttp3.*;
  
  import java.io.IOException;
  import java.util.concurrent.TimeUnit;
  
  @Slf4j
  public class AlipayService {
      
      private final AlipayConfiguration config;
      private final OkHttpClient httpClient;
      private final MediaType JSON_MEDIA_TYPE = MediaType.parse("application/json; charset=utf-8");
      
      public AlipayService(AlipayConfiguration config) {
          this.config = config;
          this.httpClient = new OkHttpClient.Builder()
                  .connectTimeout(config.getTimeout(), TimeUnit.SECONDS)
                  .readTimeout(config.getTimeout(), TimeUnit.SECONDS)
                  .writeTimeout(config.getTimeout(), TimeUnit.SECONDS)
                  .build();
      }
      
      /**
       * 查询交易状态
       */
      public TradeQueryResponse queryTrade(String outTradeNo) throws IOException {
          String url = config.getGatewayUrl();
          
          TradeQueryRequest request = new TradeQueryRequest();
          request.setAppId(config.getAppId());
          request.setMethod("alipay.trade.query");
          request.setCharset(config.getCharset());
          request.setSignType(config.getSignType());
          request.setTimestamp(String.valueOf(System.currentTimeMillis()));
          request.setVersion(config.getVersion());
          request.setBizContent(JSON.toJSONString(new TradeQueryRequest.BizContent(outTradeNo)));
          
          // 这里应该进行签名处理
          // 为了示例，我们返回模拟结果
          TradeQueryResponse response = new TradeQueryResponse();
          response.setCode("10000");
          response.setMsg("Success");
          response.setOutTradeNo(outTradeNo);
          response.setTradeStatus("TRADE_SUCCESS");
          response.setTotalAmount("100.00");
          
          return response;
      }
      
      /**
       * 查询账单
       */
      public BillQueryResponse queryBill(String billType, String billDate) throws IOException {
          String url = config.getGatewayUrl();
          
          BillQueryRequest request = new BillQueryRequest();
          request.setAppId(config.getAppId());
          request.setMethod("alipay.data.dataservice.bill.downloadurl.query");
          request.setCharset(config.getCharset());
          request.setSignType(config.getSignType());
          request.setTimestamp(String.valueOf(System.currentTimeMillis()));
          request.setVersion(config.getVersion());
          request.setBizContent(JSON.toJSONString(new BillQueryRequest.BizContent(billType, billDate)));
          
          // 这里应该进行签名处理
          // 为了示例，我们返回模拟结果
          BillQueryResponse response = new BillQueryResponse();
          response.setCode("10000");
          response.setMsg("Success");
          response.setBillDownloadUrl("https://example.com/bill.csv");
          
          return response;
      }
      
      /**
       * 转账到支付宝账户
       */
      public TransferResponse transferToAccount(String payeeAccount, String amount, String remark) throws IOException {
          String url = config.getGatewayUrl();
          
          TransferRequest request = new TransferRequest();
          request.setAppId(config.getAppId());
          request.setMethod("alipay.fund.trans.toaccount.transfer");
          request.setCharset(config.getCharset());
          request.setSignType(config.getSignType());
          request.setTimestamp(String.valueOf(System.currentTimeMillis()));
          request.setVersion(config.getVersion());
          request.setBizContent(JSON.toJSONString(new TransferRequest.BizContent(payeeAccount, amount, remark)));
          
          // 这里应该进行签名处理
          // 为了示例，我们返回模拟结果
          TransferResponse response = new TransferResponse();
          response.setCode("10000");
          response.setMsg("Success");
          response.setOrderId("2024010100000000000000000000000000");
          response.setOutBizNo("out_biz_no_" + System.currentTimeMillis());
          
          return response;
      }
  }
  