Class ViewData

java.lang.Object
  |
  +--javax.servlet.GenericServlet
        |
        +--javax.servlet.http.HttpServlet
              |
              +--ViewData

All Implemented Interfaces:

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

public class ViewData

extends javax.servlet.http.HttpServlet

Handles the login verification, errors thrown during verification, and prints the frames for the application or an message informing the user why the login failed. Upon a successful login, a session is created that stores the users name.

See Also:

Serialized Form

Constructor Summary

ViewData()

Method Summary

void	doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Handles requests using the 'get' method by passing to the 'post' method handler.
void	doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Handles requests using the 'post' method.
void	init(javax.servlet.ServletConfig config) Initialize the Servlet
void	printMessage(java.io.PrintWriter out, java.lang.String type) Generates the HTML to display a message indicating why the login failed

Methods inherited from class javax.servlet.http.HttpServlet

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

Methods inherited from class javax.servlet.GenericServlet

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

Methods inherited from class java.lang.Object

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

Constructor Detail

ViewData

public ViewData()

Method Detail

init

public void init(javax.servlet.ServletConfig config)
          throws javax.servlet.ServletException

Initialize the Servlet

Overrides:

init in class javax.servlet.GenericServlet

Parameters:

config - the configuration parameters

Throws:

javax.servlet.ServletException - a Servlet error occurred

doGet

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

Handles requests using the 'get' method by passing to the 'post' method handler.

Overrides:

doGet in class javax.servlet.http.HttpServlet

Parameters:

request - the HttpRequest

response - the HttpResponse

Throws:

java.io.IOException - an I/O error occurred

javax.servlet.ServletException - a Servlet error occurred

doPost

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

Handles requests using the 'post' method. Verifies the login parameters using a SQLRequest object and either displays the HTML frames for the application or a message explaining why the login failed

Overrides:

doPost in class javax.servlet.http.HttpServlet

Parameters:

request - the HttpRequest

response - the HttpResponse

Throws:

java.io.IOException - an I/O error occurred

javax.servlet.ServletException - a Servlet error occurred

printMessage

public void printMessage(java.io.PrintWriter out,
                         java.lang.String type)

Generates the HTML to display a message indicating why the login failed

Parameters:

out - the PrintWriter to display the output

type - the message type