java.net.URL Class in Java

URL is an acronym of Uniform resource locator. It is a pointer to locate resource in www (World Wide Web). A resource can be anything from a simple text file to any other like images, file directory etc. 

The typical URL may look like

http://www.example.com:80/index.html

The URL has the following parts:

• Protocol: In this case the protocol is HTTP, It can be HTTPS in some cases
• Hostname: Hostname represent the address of the machine on which resource is located, in this case, www.example.com
• Port Number: It is an optional attribute. If not specified then it returns -1. In the above case, the port number is 80.
• Resource name: It is the name of a resource located on the given server that we want to see

You can learn more about the URL here.

The Class structure of the URL is as shown below:

public final class java.net.URL extends java.lang.Object

The Following are constructors provided by the URL class.

Methods Provided by URL Class:

Demonstration 1

In this demonstration, we are going to create an object of URL class for a given String URL, and we are going to print hostname, protocol, filename and Port number for given URL.

// importing package required
import java.net.URL;
import java.util.Scanner;

class GFG {
    public static void main(String[] args)
    {
        String url
            = "https://www.geeksforgeeks.org/variables-in-java/";
        // Calling method to get URL info
        getUrlInfo(url);
    }
    static void getUrlInfo(String url_string)
    {
        // Creating object of URL class
        try {
            URL url = new URL(url_string);

            System.out.println("Hostname: "
                               + url.getHost());
            System.out.println("Port Number: "
                               + url.getPort());
            System.out.println("File name: "
                               + url.getFile());
            System.out.println("Protocol:  "
                               + url.getProtocol());
        }
        catch (Exception e) {
        }
    }
}

Hostname: www.geeksforgeeks.org
Port Number: -1
File name: /variables-in-java/
Protocol:  https