dea.albums
Class BaseServlet

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          dea.albums.BaseServlet

All Implemented Interfaces:

IDebugLevels, java.io.Serializable, Servlet, ServletConfig

Direct Known Subclasses:

AddPicData, ChkSite, GenOut, LinkPicData, ViewCat, ViewObj, ViewPicData

public abstract class BaseServlet

extends HttpServlet

implements IDebugLevels

See Also:

Serialized Form

Field Summary

protected static Display

display Get connection to display / log utils

Fields inherited from interface dea.common.IDebugLevels

BASIC, DEBUG_ALL, ERROR, METH_DETAIL, METH_ENTER, METH_EXIT, METH_EXT, METH_GET, METH_SET, METH_VARS, SHOW_PASS

Constructor Summary

BaseServlet()

Method Summary

static void	callPage(java.lang.String page, HttpServletRequest request, HttpServletResponse response) Display the output page
static java.lang.String	emptyToNull(java.lang.String str) Process the HTTP Delete requests.
protected java.lang.String	getParameter(HttpServletRequest request, java.lang.String name, boolean isParameterRequired, java.lang.String defaultValue) Returns the requested parameter
void	init(ServletConfig newConfig)
void	service(HttpServletRequest request, HttpServletResponse response) ************************************************************************* Process all incoming HTTP requests.

Methods inherited from class javax.servlet.http.HttpServlet

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

Methods inherited from class javax.servlet.GenericServlet

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

Methods inherited from class java.lang.Object

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

Field Detail

display

protected static final Display display

Get connection to display / log utils

Constructor Detail

BaseServlet

public BaseServlet()

Method Detail

init

public void init(ServletConfig newConfig)
          throws ServletException

Specified by:

init in interface Servlet

Throws:

ServletException

callPage

public static void callPage(java.lang.String page,
                            HttpServletRequest request,
                            HttpServletResponse response)

Display the output page

Parameters:

request - HttpServletRequest

response - HttpServletResponse

service

public void service(HttpServletRequest request,
                    HttpServletResponse response)
             throws ServletException,
                    java.io.IOException

************************************************************************* Process all incoming HTTP requests. Note Get Post ect. are redirected here.

Parameters:

request - Object that encapsulates the request to the servlet

response - Object that encapsulates the response from the servlet

Throws:

ServletException

java.io.IOException

emptyToNull

public static java.lang.String emptyToNull(java.lang.String str)

Process the HTTP Delete requests. Here for application server compatibility only calls service(request, response)

getParameter

protected java.lang.String getParameter(HttpServletRequest request,
                                        java.lang.String name,
                                        boolean isParameterRequired,
                                        java.lang.String defaultValue)
                                 throws java.lang.Exception

Returns the requested parameter

Parameters:

request - Object that encapsulates the request to the servlet

name - The name of the parameter value to return

isParameterRequired - when true, an exception is thrown when the parameter cannot be found

defaultValue - The default value to return when the parameter is not found

Returns:

The parameter value

Throws:

ServletException - Thrown when the parameter is not found

java.lang.Exception