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();
        }
    }
}