JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How To Get URL Properties in Java


Description:

The URL class provides utility methods that let you query URL objects. You can get the protocol, authority, host name, port number, path, query, filename, and reference from a URL using these accessor methods:

getProtocol() method returns the protocol identifier of the URL.
getAuthority() method returns the authority of the URL.
getHost() method returns the host name of the URL.
getPort() method returns the port number of the URL. If the port is not set, then it returns -1.
getPath() method returns the path of this URL.
getQuery() method returns the query of this URL.
getFile() method returns the filename of the URL.
getRef() method returns the reference of the URL.


Code:
package com.myjava.url;

import java.net.MalformedURLException;
import java.net.URL;

public class MyUrlProperties {

    public static void main(String a[]){
    
        try {
            String url =
		"http://www.java2novice.com:80/java_constructor_examples/?query=ok#header";
            URL myUrl = new URL(url);
            System.out.println("Protocol: "+myUrl.getProtocol());
            System.out.println("Host: "+myUrl.getHost());
            System.out.println("Port: "+myUrl.getPort());
            System.out.println("Athority of the URL: "+myUrl.getAuthority());
            System.out.println("Query: "+myUrl.getQuery());
            System.out.println("Reference: "+myUrl.getRef());
        } catch (MalformedURLException ex) {
            ex.printStackTrace();
        }
    }
}

Example Output

Protocol: http
Host: www.java2novice.com
Port: 80
Athority of the URL: www.java2novice.com:80
Query: query=ok
Reference: header

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Transient and Volatile Modifiers
Transient: The transient modifier applies to variables only and it is not stored as part of its object's Persistent state. Transient variables are not serialized.

Volatile: Volatile modifier applies to variables only and it tells the compiler that the variable modified by volatile can be changed unexpectedly by other parts of the program.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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