URLConnection class in Java

A communication channel between the URL and the program is represented by the Java URLConnection class. It may be utilized to read from and write to the given resource the URL refers to.

What is the URL?

• The term "URL" stands for "Uniform Resource Locator." An URL is a type of string that helps find a site on the Internet (WWW).
• A URL has two components:

     1.The protocol required to access the resource.

          2. Where the resource is located.

Features of the URLConnection class

1. A class called URLConnection is abstract. The two subclasses, HttpURLConnection and JarURLConnection, are responsible for establishing connections between the client Java programme and URL resources found on the internet.
2. The user can read from and write to any resource that a URL object references using the URLConnection class.
3. Once a connection has been made and a URLConnection object has been created in the Java application, we may use it to read, write, or obtain further data, such as content length.

Constructors

1. secure URL connection (URL url):- It builds a connection to the requested URL.

URLConnection Class Methods

How to obtain a URLConnection class object?

The object of the class URLConnection is returned by the openConnection() function of the URL class.

Syntax:

public URLConnection openConnection()throws IOException{}   

Displaying a webpage's source code using the URLProgram class

Numerous methods are available from the URLProgram class. Using the getInputStream() function, we can show every information on a website. It gives back all of the supplied URL's contents in a stream that may be read and shown.

URLProgram.java

import java.io.*;    
import java.net.*;    
public class URLProgram {    
public static void main(String[] args){    
try{    
URL url=new URL("http://www.microsoft.com");    
URLConnection urlcon=url.openConnection();    
InputStream stream=urlcon.getInputStream();    
int i;    
while((i=stream.read())!=-1){    
System.out.print((char)i);    
}    
}catch(Exception e){System.out.println(e);}    
}    
}    

Output: