java處理HTTP請求

import com.diyfintech.wx.service.HttpService;
import org.springframework.stereotype.Service;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
@Service
public class HttpServiceImpl implements HttpService {

  //處理http請求  requestUrl為請求地址  requestMethod請求方式，值為"GET"或"POST"
  public String httpRequest(String requestUrl,String requestMethod,String outputStr){
    
    StringBuffer buffer=null;
    try{
      URL url=new URL(requestUrl);
      HttpURLConnection conn=(HttpURLConnection)url.openConnection();
      conn.setDoOutput(true);
      conn.setDoInput(true);
      conn.setRequestMethod(requestMethod);
      conn.connect();
      //往服務器端寫內容 也就是發起http請求需要帶的參數
      if(null!=outputStr){
        OutputStream os=conn.getOutputStream();
        os.write(outputStr.getBytes("utf-8"));
        os.close();
      }
      //讀取服務器端返回的內容
      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);
      }
    }catch(Exception e){
      e.printStackTrace();
    }
    return buffer.toString();
  }

}