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JSP IN ACTION
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JSP: The Complete Reference
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View/controller interaction diagram
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Case Study: A Product Support Center
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You examine each of the JSP view pages in more detail shortly First, however, you need to look at some supporting classes
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Two sections of code are common to all the JSP view pages Rather than duplicate them in every JSP file, you store them in separate text files and include them with the <%@ include %> directive4
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InitModeljsp
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Every JSP view page needs to declare the model as a session bean and ensure a database connection is available This common function is accomplished by having the view pages include the following code:
<%-- Define and initialize the model --%> <jsp:useBean id="model" scope="session" class="comlyricnotesupportmodelWebModel"> <% modelinit(application); %> </jsp:useBean> <%-- Provide an alias for the controller servlet --%> <% String BASEURL = requestgetContextPath(); String CONTROLLER = BASEURL + "/servlet/controller"; %>
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This code in initModeljsp does three things: I Declares a JavaBean named model having session scope and initialized with a comlyricnotesupportmodelWebModel object I Invokes the model s init() method to extract application variables from webxml and establish a session-aware database connection This method is called only once, when the model is first bound to the session I Initializes constants specifying the base URL for the application and the name of the controller servlet These constants are used in URLs and form action attributes elsewhere in the view
4 Why the include directive rather than <jsp:include> Because the included sections define and use constants that need to be common to both the included module and the including module
JSP: The Complete Reference
Bannerjsp For a common look and feel in all the JSP view pages, a standard header is used This header, stored in a file named Bannerjsp, contains an HTML table that includes the company logo and standard navigation links
<TABLE BORDER=0 CELLSPACING=3 CELLPADDING=3 WIDTH=500> <TR> <TD><IMG SRC="<%= BASEURL %>/images/logojpg"></TD> </TR> <TR> <TD CLASS="menucell" ALIGN="RIGHT"> <A CLASS="menuitem" HREF="<%= BASEURL %>/Problemsjsp">Problems</A> <SPAN CLASS="menuitem">|</SPAN> <A CLASS="menuitem" HREF="<%= BASEURL %>/Productsjsp">Products</A> <SPAN CLASS="menuitem">|</SPAN> <A CLASS="menuitem" HREF="<%= BASEURL %>/Customersjsp">Customers</A> </TR> </TABLE>
Neither InitModeljsp nor Bannerjsp is designed to be called directly by a user To prevent this, they are stored in the /WEB-INF folder This makes them visible to the application itself, but not to users on the Web
ErrorPagejsp
A final supporting module is the error page, listed in the following:
<%@ page session="false" %> <%@ page import="javaioPrintWriter" %> <%@ page isErrorPage="true" %> <HTML> <HEAD> <TITLE>Error Page</TITLE> <LINK REL="stylesheet" HREF="stylecss"> </HEAD> <BODY> <H3>Error</H3> The following error occurred:
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Case Study: A Product Support Center
<PRE> <% exceptionprintStackTrace(new PrintWriter(out)); %> </PRE> </BODY> </HTML>
ErrorPagejsp does little more than display a stack trace for any uncaught exception This is useful during system development, but should probably be replaced by something more user-friendly in production
JSP View Pages
Using Figure 19-3 as our road map, let s look at the nine individual JSP view pages: I Customersjsp I Customerjsp I Problemjsp I Confirmjsp I Productsjsp Prompts for customer search argument Selection list of customer search results
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I CustomersListjsp
Detail view of a single customer record Detail view of a single problem record Confirmation screen shown after problem update Prompts for product search argument Selection list of product search results Selection list of problems for a product
I ProductsListjsp I Problemsjsp
I ProductProblemsjsp
Prompts for a product ID
Customersjsp
The initial entry point of call center agents is typically the customer search view, listed in the following:
<%@ page session="true" %> <%@ page errorPage="/ErrorPagejsp" %> <%@ page import="comlyricnotesupportmodel*" %> <%@ include file="/WEB-INF/InitModeljsp" %> <HTML> <HEAD> <TITLE>Customer Search</TITLE> <LINK REL="stylesheet" HREF="<%= BASEURL %>/stylecss"> </HEAD> <BODY>
JSP: The Complete Reference
<%@ include file="/WEB-INF/Bannerjsp" %> <H3>Customer Search</H3> <FORM METHOD="POST" ACTION="<%= CONTROLLER %>/Customers/Search"> <B>Customer name</B>: <INPUT TYPE="TEXT" NAME="customerSearchArgument" SIZE="20"> <INPUT TYPE="SUBMIT" VALUE="Search"> </FORM> </BODY> </HTML>
After including the model initialization and banner code, this JSP page uses an HTML form to prompt for a customer name search string If the call center agent is talking to a customer named Eleanor Wagner, for example, the agent may search for names containing the letter W, as shown in Figure 19-4 When the agent clicks the search button, the form is then submitted to a servlet that performs the search (which is discussed later in this chapter in the Controller Classes section)
Figure 19-4
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