java学习之url

 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();
         }
     }
 }