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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List Of All Networking Examples:

  1. How to create URL object?
  2. How to create File URL object?
  3. How to create URL object with all properties?
  4. How to get URL properties?
  5. How to get URL object with relative path?
  6. How to compare two URL objects path?
  7. How to read URL content?
  8. How to encode URL content?
  9. How to decode URL content?
  10. How to get my machine IP address?
  11. How to get IP address of a host?
  12. How to get host name by IP address?
  13. How to get machine host name?
  14. How to get all IP addresses of a host?
Knowledge Centre
When to use LinkedList or ArrayList?
Accessing elements are faster with ArrayList, because it is index based. But accessing is difficult with LinkedList. It is slow access. This is to access any element, you need to navigate through the elements one by one. But insertion and deletion is much faster with LinkedList, because if you know the node, just change the pointers before or after nodes. Insertion and deletion is slow with ArrayList, this is because, during these operations ArrayList need to adjust the indexes according to deletion or insetion if you are performing on middle indexes. Means, an ArrayList having 10 elements, if you are inserting at index 5, then you need to shift the indexes above 5 to one more.
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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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