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()); } } 

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

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()); } } 

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