Class ImageInfo

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

All Implemented Interfaces:

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

public class ImageInfo

extends javax.servlet.http.HttpServlet

Handles querying the database using a SQLRequest object and generating a XML document via a XMLGenerator object.

See Also:

Serialized Form

Constructor Summary

ImageInfo()

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

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

ImageInfo

public ImageInfo()

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. Retrieves the requested image data using a SQLRequest object, generates the corresponding XML using a XMLGenerator object, and prints the XML to the web browser.

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

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