Class Nav

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

All Implemented Interfaces:

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

public class Nav

extends javax.servlet.http.HttpServlet

Creates and displays the navigation bar. Uses a SQLRequest to query the database for the images to include in the drop-down list

See Also:

Serialized Form

Constructor Summary

Nav()

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	printError(java.io.PrintWriter out) Generates the HTML to display a message informing the user that an error occurred while accessing the database
void	printMessage(java.io.PrintWriter out) Generates the HTML to display a message informing the user that they need to login before accessing the application

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

Nav

public Nav()

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. Creates the HTML output for the navigation bar.

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)

Generates the HTML to display a message informing the user that they need to login before accessing the application

Parameters:

out - the PrintWriter to display the output

printError

public void printError(java.io.PrintWriter out)

Generates the HTML to display a message informing the user that an error occurred while accessing the database

Parameters:

out - the PrintWriter to display the output