Java如何获取URL的部分？

在Java编程中，如何获取URL的一部分？

以下示例显示了如何通过net.URL类的url.getProtocol()和url.getFile()方法等获取URL的部分。

package com.yiibai;

import java.net.URL;

public class PartsOfURL {
    public static void main(String[] args) throws Exception {
        String webUrl = "http://www.yiibai.com/javaexamples/index.html";
        URL url = new URL(webUrl);
        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());
    }
}

Java

上述代码示例将产生以下结果 -

URL is http://www.yiibai.com/javaexamples/index.html
protocol is http
file name is /javaexamples/index.html
host is www.yiibai.com
path is /javaexamples/index.html
port is -1
default port is 80

Shell

获取URL的一部分的另一个示例 -

package com.yiibai;

import java.net.URL;

public class PartsOfURL2 {
   public static void main(String args[]) throws Exception {
      URL u = new URL("http://www.yiibai.com");
      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());
   }
}

Java

上述代码示例将产生以下结果 -

The URL is http://www.yiibai.com
The file part is
host is www.yiibai.com
path is
port is -1
default port is 80