ch3.dataBean
Class Controller

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          ch3.dataBean.Controller

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class Controller
extends javax.servlet.http.HttpServlet

The controller is the servlet that encapulates the logic of the application. In this example, the data for the application is encapsulated in a bean. The bean is added to the session, so that it can be retrieved by the JSPs.

The data from the query string must be copied from the request into the bean.

See Also:

Serialized Form

Constructor Summary

Controller()

Method Summary

protected void

doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) When the browser makes a GET request, this is the method in the controller that is called.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPost, 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

Controller

public Controller()

Method Detail

doGet

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

When the browser makes a GET request, this is the method in the controller that is called.

A bean is used to encapsulate the data from the application.

1. The bean must be added to the session, so that JSPs can retrieve it.
2. The data in the query string must be copied from the request into the bean.

Overrides:

doGet in class javax.servlet.http.HttpServlet

Parameters:

request - Encapsulates all of the request information that is needed to communicate with the browser.

response - Encapsulates all of the response information that is needed to communicate with the browser.

Throws:

javax.servlet.ServletException - A servlet exception is a severe error that will prevent further processing.

java.io.IOException - An IO exception is a severe error that will prevent further processing.