org.arch4j.webpresentation
Class FrontControllerServlet

java.lang.Object
  |
  +--javax.servlet.GenericServlet
        |
        +--javax.servlet.http.HttpServlet
              |
              +--org.arch4j.webpresentation.FrontControllerServlet

All Implemented Interfaces:

Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

Direct Known Subclasses:

CommandDrivenFrontController

public abstract class FrontControllerServlet

extends javax.servlet.http.HttpServlet

This class is the root of a hierarchy of servlet-based classes that can be used as a front-end handler of requests to a web site.

Version:

$Revision: 1.1 $

Author:

$Author: rgreinke $

See Also:

Serialized Form

Constructor Summary

FrontControllerServlet()

Method Summary

protected void	doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Called by the server (via the service method) to allow a servlet to handle a GET request.
protected void	doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Called by the server (via the service method) to allow a servlet to handle a POST request.
protected void	forward(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, String target) Forwards the request to another resource (servlet, JSP file, or HTML file) on the server.
protected abstract void	handleRequest(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Handles requests for both HTTP GET and POST methods.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FrontControllerServlet

public FrontControllerServlet()

Method Detail

doGet

protected void doGet(javax.servlet.http.HttpServletRequest request,
                     javax.servlet.http.HttpServletResponse response)
              throws javax.servlet.ServletException,
                     IOException

Called by the server (via the service method) to allow a servlet to handle a GET request.

Overrides:

doGet in class javax.servlet.http.HttpServlet

Parameters:

request - an HttpServletRequest object that contains the request the client has made of the servlet

response - an HttpServletResponse object that contains the response the servlet sends to the client

Throws:

IOException - if an input or output error is detected when the servlet handles the GET request

javax.servlet.ServletException - if the request for the GET could not be handled

doPost

protected void doPost(javax.servlet.http.HttpServletRequest request,
                      javax.servlet.http.HttpServletResponse response)
               throws javax.servlet.ServletException,
                      IOException

Called by the server (via the service method) to allow a servlet to handle a POST request.

Overrides:

doPost in class javax.servlet.http.HttpServlet

Parameters:

request - an HttpServletRequest object that contains the request the client has made of the servlet

response - an HttpServletResponse object that contains the response the servlet sends to the client

Throws:

IOException - if an input or output error is detected when the servlet handles the request

javax.servlet.ServletException - if the request for the POST could not be handled

handleRequest

protected abstract void handleRequest(javax.servlet.http.HttpServletRequest request,
                                      javax.servlet.http.HttpServletResponse response)
                               throws javax.servlet.ServletException,
                                      IOException

Handles requests for both HTTP GET and POST methods. This method should be overridden and implemented in subclasses.

Parameters:

request - An HttpServletRequest object that contains the request the client has made of the servlet.

response - An HttpServletResponse object that contains the response the servlet sends to the client.

Throws:

javax.servlet.ServletException - If the request could not be handled.

IOException - If an input or output error is detected when the servlet handles the request.

forward

protected void forward(javax.servlet.http.HttpServletRequest request,
                       javax.servlet.http.HttpServletResponse response,
                       String target)
                throws javax.servlet.ServletException,
                       IOException

Forwards the request to another resource (servlet, JSP file, or HTML file) on the server.

Parameters:

request - An HttpServletRequest object that contains the request the client has made of the servlet.

response - An HttpServletResponse object that contains the response the servlet sends to the client.

target - A String specifying the pathname to the resource.

Throws:

javax.servlet.ServletException - If the target resource throws this exception.

IOException - If the target resource throws this exception.