如何在 Java 中获取 URL 的各个部分

问题描述

如何获取 URL 的各个部分?

解决方案

以下示例显示如何借助 net.URL 类的 url.getProtocol()、url.getFile() 方法等获取 URL 的各个部分。

import java.net.URL;

public class Main {
   public static void main(String[] args) throws Exception {
      URL url = new URL(args[0]);
      System.out.println("URL is " + url.toString());
      System.out.println("protocol is " + url.getProtocol());
      System.out.println("file name is " + url.getFile());
      System.out.println("host is " + url.getHost());
      System.out.println("path is " + url.getPath());
      System.out.println("port is " + url.getPort());
      System.out.println("default port is " + url.getDefaultPort());
   }
}

结果

上述代码示例将产生以下结果。

URL is http://www.server.com
protocol is TCP/IP
file name is java_program.txt
host is 122.45.2.36
path is 
port is 2
default port is 1

以下是另一个获取 URL 各部分的示例?

import java.net.URL;

public class NewClass {
   public static void main(String args[]) throws Exception {
      URL u = new URL("https://www.tutorialspoint.com/javaexamples/net_singleuser.html");
      System.out.println("The URL is " + u);
      System.out.println("The file part is " + u.getFile());
      System.out.println("host is " + u.getHost());
      System.out.println("path is " + u.getPath());
      System.out.println("port is " + u.getPort());
      System.out.println("default port is " + u.getDefaultPort());
   }
}

上述代码示例将产生以下结果。

The URL is https://www.tutorialspoint.com/javaexamples/net_singleuser.htm
The file part is /javaexamples/net_singleuser.htm
host is www.tutorialspoint.com
path is /javaexamples/net_singleuser.htm
port is -1
default port is 443