URL Class in Java with Examples
URL known as Uniform Resource Locator is simply a string of text that identifies all the resources on the Internet, telling us the address of the resource, how to communicate with it, and retrieve something from it.
Components of a URL
A URL can have many forms. The most general however follows a three-components system as proposed below:
- Protocol: HTTP is the protocol here
- Hostname: Name of the machine on which the resource lives.
- File Name: The pathname to the file on the machine.
- Port Number: Port number to which to connect (typically optional).
The URL class is the gateway to any of the resources available on the internet. A Class URL represents a Uniform Resource Locator, which is a pointer to a “resource” on the World Wide Web. A resource can point to a simple file or directory, or it can refer to a more complicated object, such as a query to a database or to a search engine.
Constructors of the URL class
- URL(String address) throws MalformedURLException: It creates a URL object from the specified String.
- URL(String protocol, String host, String file): Creates a URL object from the specified protocol, host, and file name.
- URL(String protocol, String host, int port, String file): Creates a URL object from protocol, host, port, and file name.
- URL(URL context, String spec): Creates a URL object by parsing the given spec in the given context.
- URL(String protocol, String host, int port, String file, URLStreamHandler handler):
Creates a URL object from the specified protocol, host, port number, file, and handler.
- URL(URL context, String spec, URLStreamHandler handler):
Creates a URL by parsing the given spec with the specified handler within a specified context.
Important Methods used in URL class
|getAuthority()||Returns the authority part of URL or null if empty|
|getDefaultPort()||Returns the default port used|
|getFile()||Returns the file name.|
|getHost()||Return the hostname of the URL in IPv6 format|
|getPath()||Returns the path of the URL, or null if empty|
|getPort()||Returns the port associated with the protocol specified by the URL|
|getProtocol()||Returns the protocol used by the URL|
|getQuery()||the Returns the query part of URL. A query is a part after the ‘?’ in the URL. Whenever logic is used to display the result, there would be a query field in the URL. It is similar to querying a database.|
|getRef()||Returns the reference of the URL object. Usually, the reference is the part marked by a ‘#’ in the URL. You can see the working example by querying anything on Google and seeing the part after ‘#’|
|toString()||As in any class, toString() returns the string representation of the given URL object.|
https://www.google.co.in/?gfe_rd=cr&ei=ptYqWK26I4fT8gfth6CACg#q=geeks+for+geeks+java https://www.geeksforgeeks.org/jvm-works-jvm-architecture/ Different components of the URL3- Protocol:- https Hostname:- www.google.co.in Default port:- 443 Query:- q=gnu&rlz=1C1CHZL_enIN714IN715&oq=gnu&aqs=chrome..69i57j69i60l5.653j0j7&sourceid=chrome&ie=UTF-8 Path:- /search File:- /search?q=gnu&rlz=1C1CHZL_enIN714IN715&oq=gnu&aqs=chrome..69i57j69i60l5.653j0j7&sourceid=chrome&ie=UTF-8 Reference:- q=geeks+for+geeks+java
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