URL：统一资源定位符

例如：https://【某一域名】指向 39.156.69.79【某一网站空间IP】

URL 组成：协议://ip地址:端口/项目名/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()); }}

URL下载资源

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(); }}

效果一览

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