java发送get请求和post请求示例

java向服务端发送GET和POST请求

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); }}