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Now we have a bean that hides all the messy details of finding Web pages and parsing HTML, and simply presents a means of getting current weather conditions given an airport code The bean reduces the process to the complexity of a function call, hardly more difficult than finding the cosine of an angle by calling Mathcos() We can now put this bean to work in our portal Web page Our strategy is now to record the user s location preference (airport code) with a persistent cookie Each time the Web page is displayed, the airport code is retrieved from the cookie and is used to initialize an Observation bean The resulting location, time, and temperature are displayed unobtrusively on a line under the logo at the top of the page In addition, the line contains a hyperlink that enables the user to select a new airport code The following shows a portion of the portal JSP:

<%@ page session="false" %> <HTML> <HEAD> <TITLE>LyricNote Portal</TITLE> <LINK REL="stylesheet" HREF="stylecss"> </HEAD> <BODY> <IMG SRC="images/lyric_notepng"> <HR COLOR="#000000"> <%-- Get weather cookie --%> <% String airportCode = "RDU"; Cookie[] cookies = requestgetCookies(); if (cookies != null) { for (int i = 0; i < cookieslength; i++) { Cookie cookie = cookies[i]; if (cookiegetName()equals("airportCode")) { airportCode = cookiegetValue(); break; } } }

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%> <%-- Get the weather observation bean for that location --%> <jsp:useBean id="wobs" class="jspcrbeansweatherObservation"> <jsp:setProperty name="wobs" property="airportCode" value="<%= airportCode %>"/> </jsp:useBean> <%-- Show weather information --%> <SPAN CLASS="whiteOnBlue"> Weather </SPAN> <SPAN CLASS="blueOnWhite"> <jsp:getProperty name="wobs" property="location"/> <jsp:getProperty name="wobs" property="time"/> <jsp:getProperty name="wobs" property="temperature"/> C° </SPAN> <A CLASS="whiteOnBlue" HREF="AirportSelectionhtml">  Select City  </A> <HR COLOR="#000000"> <%-- Show the rest of the web page --%> </BODY> </HTML>

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The array of cookies returned with the HTTP request is scanned for a cookie whose name is airportCode If this cookie exists, its value is substituted for the default airport code (RDU, for Raleigh/Durham North Carolina) Next, the Observation bean is declared

and initialized with the selected airport code:

<jsp:setProperty name="wobs"

All that remains is to extract the bean properties and to write them to the output stream:

<jsp:getProperty name="wobs" property="location"/> <jsp:getProperty name="wobs" property="time"/> <jsp:getProperty name="wobs" property="temperature"/> C°

Figure 15-6 shows the resulting display If the user clicks the Select City hyperlink, a list of airports for which weather data is known to be available is presented, as seen in Figure 15-7 This isn t a JSP page, only a simple HTML form that invokes the proper cookie-setting JSP The form action attribute points to SetAirportCodejsp, which is a nonvisual JSP page that sends the new airport code cookie to the user and redirects back to the portal page, as shown in the following code

Figure 15-6

15:

<%@ page session="false" %> <% String airportCode = requestgetParameter("airportCode"); if (airportCode != null) { Cookie cookie = new Cookie("airportCode", airportCode); final int ONE_YEAR = 60 * 60 * 24 * 365; cookiesetMaxAge(ONE_YEAR); responseaddCookie(cookie); } responsesendRedirect("Portaljsp"); %>

If the Web user happens to be located in Roswell, New Mexico (or interested in weather conditions for landing there), and chooses the appropriate line in the airport selection box, the airport code cookie value is set to ROW All subsequent requests through the LyricNote portal cause the Observation bean to retrieve weather conditions at Roswell Industrial Air Center Airport (see Figure 15-8)

<StoredProcedure(Name:="uspGetRoleDescription")> _ Public Function UspGetRoleDescription( _ <Parameter(DbType:="VarChar(50)")> ByVal description As String) _ As StoredProcedureResult(Of Role) Return MyBase.ExecuteStoredProcedure(Of Role)(MethodBase.GetCurrentMethod, _ description) End Function

Figure 15-7

Figure 15-8

Summary

Component-based programming in the Java architecture uses JavaBeans The beans programming model uses public get and set methods to access private bean properties, event listeners to link other classes to the state of a bean, and serialization to make beans persistent The JSP programming environment provides standard tags for declaring and accessing beans: I <jsp:useBean> I <jsp:setProperty> I <jsp:getProperty> The useBean tag can declare, instantiate, and initialize a bean This tag has a variety of attribute combinations that enable the bean to be extracted from an existing namespace, created as a new instance, or restored from a serialized object The namespaces supported are page scope, request scope, session scope, or application scope

15:

setProperty and getProperty are used to store and retrieve properties from a bean In addition to literal string values, properties can be set from both form parameters and request time expressions JavaBeans offer significant advantages in the JSP environment They can be written and tested in isolation, and then reused in applet, servlet, and standalone application contexts JavaBeans also reduce the amount of Java code exposed in JSP scriptlets and declarations In conjunction with cookies, custom tags, and other advanced JSP techniques, JavaBeans provide a reliable, productive base for developing useful Web applications

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