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  Java 示例 - URL 的一部分

  • 问题描述

    如何获取 URL 的各个部分？

  • 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());
   }
}

  • 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
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