JAVA HTTP通信

JAVA HTTP通信

转自：http://blog.sina.com.cn/s/blog_5dabcb7b0100hpho.html

package cn.core.util;

import java.io.BufferedReader;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLEncoder;

 

public   class  HttpInvoker   {

 

      public   static   final  String GET_URL  =   "http://www.baidu.cn";

      public   static   final  String POST_URL  =   "http://www.baidu.cn";

      public   static   void  readContentFromGet()  throws  IOException{

          //  拼凑get请求的URL字串，使用URLEncoder.encode对特殊和不可见字符进行编码 

         //String getURL  =  GET_URL  +   "?username=" +  URLEncoder.encode("fatman" ,"utf-8");

     String getURL  =  GET_URL;

         URL getUrl  =   new  URL(getURL);

          //  根据拼凑的URL，打开连接，URL.openConnection函数会根据URL的类型，

          //  返回不同的URLConnection子类的对象，这里URL是一个http，因此实际返回的是HttpURLConnection 

         HttpURLConnection connection  =  (HttpURLConnection) getUrl.openConnection();

          //  进行连接，但是实际上get request要在下一句的connection.getInputStream()函数中才会真正发到

          //  服务器 

         connection.connect();

          //  取得输入流，并使用Reader读取 

         BufferedReader reader  =   new  BufferedReader( new  InputStreamReader(connection.getInputStream()));

         System.out.println( " ============================= " );

         System.out.println( " Contents of get request " );

         System.out.println( " ============================= " );

         String lines;

         while((lines  =  reader.readLine())  !=   null ){

             System.out.println(lines);

         } 

         reader.close();

         connection.disconnect();

         System.out.println( " ============================= " );

         System.out.println( " Contents of get request ends " );

         System.out.println( " ============================= " );

     } 

 

     public   static   void  readContentFromPost()  throws  IOException{

          //  Post请求的url，与get不同的是不需要带参数 

         URL postUrl  =   new  URL(POST_URL);

          //  打开连接 

         HttpURLConnection connection  =  (HttpURLConnection) postUrl

                 .openConnection();

          //  设置是否向connection输出，因为这个是post请求，参数要放在

          //  http正文内，因此需要设为true 

         connection.setDoOutput( true );

         connection.setDoInput( true );

         //有的请求不支持POST请求

         //connection.setRequestMethod( "POST" );

         connection.setUseCaches( false );

         connection.setInstanceFollowRedirects( true );

         //connection.setRequestProperty("Content-Type" ,"application/x-www-form-urlencoded");

         connection.setRequestProperty("Content-Type" ,"text/html");

         connection.connect();

//         DataOutputStream out  =   new  DataOutputStream(connection.getOutputStream());

//         String content ="firstname=" +  URLEncoder.encode( "一个大肥人" ,  "utf-8" );

//         out.writeBytes(content); 

//         out.flush();

//         out.close();  //  flush and close 

         BufferedReader reader  =   new  BufferedReader( new  InputStreamReader(connection.getInputStream()));

         String line;

         System.out.println( " ============================= " );

         System.out.println( " Contents of post request " );

         System.out.println( " ============================= " );

           while  ((line  =  reader.readLine())  !=   null ){

             System.out.println(line);

         } 

         System.out.println( " ============================= " );

         System.out.println( " Contents of post request ends " );

         System.out.println( " ============================= " );

         reader.close();

         connection.disconnect();

     } 

 

        

       public   static   void  main(String[] args){

          //  TODO Auto-generated method stub 

           try{

             //readContentFromGet();

             readContentFromPost();

          }   catch  (IOException e){

              //  TODO Auto-generated catch block 

             e.printStackTrace();

         } 

     } 

 

 }