package com.gh.URL;

 import java.io.BufferedInputStream;

 import java.io.BufferedOutputStream;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.net.URL;

 import java.net.URLConnection;

 /**

  * 利用url下载文件

  *

  * @author ganhang

  *

  */

 public class URLDemo {

     public static void main(String[] args) {

         try {

             URL url=new URL("http://localhost:8080/hehe/1.jpg");//tomcat启动一个服务器

             //System.out.println("内容:"+url.getContent());//获得内容

             System.out.println("主机名:"+url.getHost());//获得主机名

             System.out.println("路径："+url.getPath());//获得路径

             System.out.println("端口号："+url.getPort());//获得端口号

             System.out.println("协议："+url.getProtocol());

             URLConnection conn= url.openConnection();//获得连接对象

             //获得连接对象的字节缓存输入流

             //上传用getOutputStream()

             BufferedInputStream bis= new BufferedInputStream(conn.getInputStream());

             //下载到当前目录的缓存输出流

             BufferedOutputStream bos =new BufferedOutputStream(new FileOutputStream("1.jpg"));

             int len =-1;

             byte[] b =new byte[1024];

             while((len=bis.read(b))!=-1){

                 bos.write(b,0,len);

                 bos.flush();

             }

             bis.close();

             bos.close();

             System.out.println("下载成功");

         } catch (IOException e) {

             e.printStackTrace();

         }

     }

 }