How Does URL Programming works in Java Development

Learning Java Programming Made Easy


Java URL:

The Java URL class represents an URL. URL is an acronym for Uniform Resource Locator. It points to a resource on the World Wide Web. For example:

A URL contains many information:

1. Protocol: In this case, http is the protocol.
2. Server name or IP Address: In this case, www.javatpoint.com is the server name.
3. Port Number: It is an optional attribute. If we write http//ww.javatpoint.com:80/sonoojaiswal/ , 80 is the port number. If port number is not mentioned in the URL, it returns -1.
4. File Name or directory name: In this case, index.jsp is the file name.

Method	Description
public String getProtocol()	it returns the protocol of the URL.
public String getHost()	it returns the host name of the URL.
public String getPort()	it returns the Port Number of the URL.
public String getFile()	it returns the file name of the URL.
public URLConnection openConnection()	it returns the instance of URLConnection i.e. associated with this URL.

1. //URLDemo.java  
2. import java.io.*;  
3. import java.net.*;  
4. public class URLDemo{  
5. public static void main(String[] args){  
6. try{  
7. URL url=new URL("http://www.javatpoint.com/java-tutorial");  
8.   
9. System.out.println("Protocol: "+url.getProtocol());  
10. System.out.println("Host Name: "+url.getHost());  
11. System.out.println("Port Number: "+url.getPort());  
12. System.out.println("File Name: "+url.getFile());  
13.   
14. }catch(Exception e){System.out.println(e);}  
15. }  
16. }