Java 示例 - URL 的一部分

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  问题描述

  如何获取 URL 的各个部分？
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  解决方案

  以下示例展示了如何借助 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());
     }
  }
  

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  结果

  上面的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
  

  以下是获取 URL 部分的另一个示例？

  
  import java.net.URL;
  public class NewClass {
     public static void main(String args[]) throws Exception {
        URL u = new URL("https://www.cainiaoya.com/javaexamples/net_singleuser.htm");
        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());
     }
  }
  

  上面的代码示例将产生以下结果。

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