Java 根据url下载网络资源

package lesson04;

import java.net.MalformedURLException;
import java.net.URL;

/**
 * URL：统一资源定位符
 */
public class URLDemo1 {

  public static void main(String[] args) throws MalformedURLException {
    URL url = new URL("http://localhost:8080/helloworld/index.jsp?username=kuangshen&password=123");
    //协议名
    System.out.println(url.getProtocol());
    //主机名-主机ip
    System.out.println(url.getHost());
    //端口
    System.out.println(url.getPort());
    //地址-文件路径
    System.out.println(url.getPath());
    //文件-全路径
    System.out.println(url.getFile());
    //查询部分-参数
    System.out.println(url.getQuery());
  }

}

package lesson04;

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

/**
 * URL下载资源
 */
public class URLDown {

  public static void main(String[] args) throws Exception {
    //1、下载地址
    URL url = new URL("https://m10.music.126.net/20201121104035/2c5eb73ce4421a090b62647f6c486e2c/yyaac/obj/wonDkMOGw6XDiTHCmMOi/3625445007/7d37/4109/d0ef/d56e8176f5789a4e6f8b2173ce500bf6.m4a");

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

    InputStream inputStream = urlConnection.getInputStream();

    FileOutputStream fos = new FileOutputStream("f6.m4a");

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

    //关闭
    fos.close();
    inputStream.close();

    //断开连接
    urlConnection.disconnect();
  }

}