package com.hongyuan.test; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.HttpURLConnection; import java.net.URL; public class HttpClient {  //发送一个GET请求  public static String get(String path) throws Exception{   HttpURLConnection httpConn=null;   BufferedReader in=null;   try {    URL url=new URL(path);    httpConn=(HttpURLConnection)url.openConnection();    //读取响应    if(httpConn.getResponseCode()==HttpURLConnection.HTTP_OK){     StringBuffer content=new StringBuffer();     String tempStr="";     in=new BufferedReader(new InputStreamReader(httpConn.getInputStream()));     while((tempStr=in.readLine())!=null){      content.append(tempStr);     }     return content.toString();    }else{     throw new Exception("请求出现了问题!");    }   } catch (IOException e) {    e.printStackTrace();   }finally{    in.close();    httpConn.disconnect();   }   return null;  }  //发送一个GET请求,参数形式key1=value1&key2=value2...  public static String post(String path,String params) throws Exception{   HttpURLConnection httpConn=null;   BufferedReader in=null;   PrintWriter out=null;   try {    URL url=new URL(path);    httpConn=(HttpURLConnection)url.openConnection();    httpConn.setRequestMethod("POST");    httpConn.setDoInput(true);    httpConn.setDoOutput(true);    //发送post请求参数    out=new PrintWriter(httpConn.getOutputStream());    out.println(params);    out.flush();    //读取响应    if(httpConn.getResponseCode()==HttpURLConnection.HTTP_OK){     StringBuffer content=new StringBuffer();     String tempStr="";     in=new BufferedReader(new InputStreamReader(httpConn.getInputStream()));     while((tempStr=in.readLine())!=null){      content.append(tempStr);     }     return content.toString();    }else{     throw new Exception("请求出现了问题!");    }   } catch (IOException e) {    e.printStackTrace();   }finally{    in.close();    out.close();    httpConn.disconnect();   }   return null;  }  public static void main(String[] args) throws Exception {   //String resMessage=HttpClient.get("http://localhost:3000/hello?hello=hello get");   String resMessage=HttpClient.post("http://localhost:3000/hello", "hello=hello post");   System.out.println(resMessage);  } }