URL class in Java with Examples
The URL class is the gateway to any of the resource 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
What is a URL?
As many of you must be knowing that Uniform Resource Locator-URL is a string of text that identifies all the resources on Internet, telling us the address of the resource, how to communicate with it and retrieve something from it.
A Simple URL looks like:
Components of a URL:-
A URL can have many forms. The most general however follows three-components system-
- Protocol: HTTP is the protocol here
- Hostname: Name of the machine on which the resource lives.
- File Name: The path name to the file on the machine.
- Port Number: Port number to which to connect (typically optional).
Some constructors for 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.
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
Explanation of some methods used in the above program is as follows:-
- public String toString(): As in any class, toString() returns the string representation of the given URL object.
- public String getAuthority(): returns the authority part of URL or null if empty.
- public String getPath(): returns the path of the URL, or null if empty.
- public String getQuery(): returns the query part of URL. Query is the part after the ‘?’ in the URL. Whenever logic is used to display the result, there would be a query field in URL. It is similar to querying a database.
- public String getHost(): return the hostname of the URL in IPv6 format.
- public String getFile(): returns the file name.
- public String 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 ‘#’.
- public int getPort(): returns the port associated with the protocol specified by the URL.
- public int getDefaultPort: returns the default port used.
- public String getProtocol(): returns the protocol used by the URL.
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