coreservlets
Class CatalogPage

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

Direct Known Subclasses:

KidsBooksPage, TechBooksPage

public abstract class CatalogPage

extends HttpServlet

Base class for pages showing catalog entries. Servlets that extend this class must specify the catalog entries that they are selling and the page title before the servlet is ever accessed. This is done by putting calls to setItems and setTitle in init.

Taken from Core Servlets and JavaServer Pages from Prentice Hall and Sun Microsystems Press, http://www.coreservlets.com/. © 2000 Marty Hall; may be freely used or adapted.

See Also:

Serialized Form

Constructor Summary

CatalogPage()

Method Summary

void	doGet(HttpServletRequest request, HttpServletResponse response) First display title, then, for each catalog item, put its short description in a level-two (H2) heading with the price in parentheses and long description below.
void	doPost(HttpServletRequest request, HttpServletResponse response) POST and GET requests handled identically.
protected void	setItems(String[] itemIDs) Given an array of item IDs, look them up in the Catalog and put their corresponding Item entry into the items array.
protected void	setTitle(String title) Sets the page title, which is displayed in an H1 heading in resultant page.

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, 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

CatalogPage

public CatalogPage()

Method Detail

setItems

protected void setItems(String[] itemIDs)

Given an array of item IDs, look them up in the Catalog and put their corresponding Item entry into the items array. The Item contains a short description, a long description, and a price, using the item ID as the unique key.

Servlets that extend CatalogPage must call this method (usually from init) before the servlet is accessed.

setTitle

protected void setTitle(String title)

Sets the page title, which is displayed in an H1 heading in resultant page.

Servlets that extend CatalogPage must call this method (usually from init) before the servlet is accessed.

doGet

public void doGet(HttpServletRequest request,
                  HttpServletResponse response)
           throws ServletException,
                  IOException

First display title, then, for each catalog item, put its short description in a level-two (H2) heading with the price in parentheses and long description below. Below each entry, put an order button that submits info to the OrderPage servlet for the associated catalog entry.

To see the HTML that results from this method, do "View Source" on KidsBooksPage or TechBooksPage, two concrete classes that extend this abstract class.

Overrides:

doGet in class HttpServlet

doPost

public void doPost(HttpServletRequest request,
                   HttpServletResponse response)
            throws ServletException,
                   IOException

POST and GET requests handled identically.

Overrides:

doPost in class HttpServlet