用URL从Tomcat服务端下载文件

package day2;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class URLdemo1 {
    //URL，统一资源定位符
    //http://localhost:8080/demos/fufu.jpg
    //协议     主机名    端口号  资源路径      ?参数列表（键值对形式）
    //用URL从Tomcat服务端下载文件

    public static void main(String[] args) throws IOException {
        URL url=new URL("http://localhost:8080/demos/fufu.jpg");
        //获取 协议，端口号，参数列表
        System.out.println(url.getProtocol()+","+url.getPort()+","+url.getQuery());
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.connect();
        InputStream is=urlConnection.getInputStream();
        FileOutputStream fos=new FileOutputStream("fufu1.jpg");

        byte[] buffer=new byte[1024];
        int len;
        while((len=is.read(buffer))!=-1){
            fos.write(buffer,0,len);
        }
        System.out.println("下载完成");

        fos.close();
        is.close();
        urlConnection.disconnect();
    }
}