In this tutorial you will learn about the Servlet HttpServlet and its application with practical example.
Servlet HttpServlet Class
The HttpServlet class is a sub class of GenericServlet Class, It means it extends GenericServlet class and also it implements Serializable interface. It provides some specific methods like doGet, doPost, doHead, doTrace ,doDelete etc.
Syntax:-
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public abstract class HttpServlet extends GenericServlet implements java.io.Serializable. |
HttpServlet Class Methods
public void service(ServletRequest req,ServletResponse res) :- This method used to dispatches client request to the protected service method.
protected void service(HttpServletRequest req, HttpServletResponse res):- This is method which receives standard HTTP from the public service method and dispatch them to the doXXX() methods(depends upon incoming http request).
3.protected void doGet(HttpServletRequest req, HttpServletResponse res):- This method called by the server(via service method) to allow a servlet to handle GET request.
4 protected void doPost(HttpServletRequest req, HttpServletResponse res):- This method called by the server(via service method) to allow a servlet to handle POST request.
protected void doHead(HttpServletRequest req, HttpServletResponse res):- This method receives an HTTP Head request from the protected service method and handle the request.
6.protected void doOptions(HttpServletRequest req, HttpServletResponse res):- This method called by the server(via service method) to allow a servlet to handle OPTIONS request.
7.protected void doPut(HttpServletRequest req, HttpServletResponse res) :- This method called by the server(via service method) to allow a servlet to handle PUT request.
8.protected void doTrace(HttpServletRequest req, HttpServletResponse res):- This method called by the server(via service method) to allow a servlet to handle TRACE request.
9.protected void doDelete(HttpServletRequest req, HttpServletResponse res):- This method called by the server(via service method) to allow a servlet to handle DELETE request.
10.protected long getLastModified(HttpServletRequest req):- This method returns the time the HttpServletRequest object was last modified.
