java URL下载网络资源

import sun.net.www.protocol.http.HttpURLConnection;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class URLDown {
    public static void main(String[] args) throws Exception{
        //1. 下载地址
        URL url = new URL("http://localhost:8080/shisan/look.txt");

        //2. 连接到这个资源
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

        InputStream inputStream = urlConnection.getInputStream();

        FileOutputStream fos = new FileOutputStream("m1.mp4");

        byte[] buffer = new byte[1024];
        int len;
        while ((len=inputStream.read(buffer))!=-1){
            fos.write(buffer,0,len);//写出这个数据
        }

        fos.close();
        inputStream.close();
        urlConnection.disconnect();

    }
}