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438Chapter 19JSP: Servlets Turned Inside Outservlet). The forEach will iterate over those values without you having to codethe explicit next() calls or index your way through an array.The bottom of the loop is delimited by the closing tag:For more information on these and other tags, check out• http://java.sun.com/products/jsp/jstl• http://jakarta.apache.org/products/jsp/jstl• The references at the end of this chapterBeyond the standard library of tags, there are other third-party collectionsof tags; you can also create your own libraries, called custom tag libraries. Whilea useful and powerful thing to do if you have a large JSP-based application,such details would expand this book well beyond its scope. If you’re interestedin this topic, please follow up with some of the excellent references at the endof this chapter.19.4USING JSP WITH BUDGETPROWe could have taken the BudgetPro example from the previous chapter andsimply translated it all into JSP files. The reason we didn’t is that it’s not howyou are likely to find JSP used “in the wild.” Since JSP files become servlets, itis not uncommon to find JSP and servlets mixed together—not arbitrarily, butin a sensible way. Remember the Model/View/Controller (MVC) pattern fromyour readings on object-oriented programming and design patterns? 2 Well, JSPmakes for a reasonable View, and a plain servlet can act as the Controller. TheModel is typically the database behind all this. That’s what we’ve done withthe BudgetPro example.We’ve taken the two main chunks of output code—that for the main accountdisplay and the form used for creating subaccounts—and turned those2. If not, then a) you should do some more reading, and b) the MVC pattern is a “classic” wayto divide the work of a GUI into three distinct parts: Model—the data behind what you aredoing or displaying; View—a particular way to display that data; and Controller—an objectthat acts as the “traffic cop” to various inputs and events, sending messages to either the View,or Model, or both.
19.5 Review439into JSP files. The main servlet class (BudgetProServlet.java) is thus “gutted”of its output, and the new version (BudgetProController.java) actsas the controller. Requests come to it via HTTP requests, but for output, itredirects the browser making that request over to the appropriate JSP.This introduces a new bit of servlet syntax—redirecting a request toanother URL. The action is taken by means of a method call on the HTTPresponse object:response.sendRedirect("BPAcct");Whereas in the previous, servlet version of BudgetPro, we would create anobject that was the next page of output:nextPage = new AccountView(current);In this version, we instead redirect the response to a JSP that produces theoutput for that page.So how does the JSP know for which account it should display information?That is shared between the JSP and the controller servlet via the sessioninformation. As with the previous, servlet-base BudgetPro, the session is usedto store the current account. It can be retrieved from the session information,as seen in line 11 of BPAcct.jsp:11:
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Java Application
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Java Application
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To my mother, for her love of words
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viiiContents1.41.51.6Chapter 22.12.
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xContents5.65.75.85.95.105.115.125.
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xiiContentsChapter 99.19.29.39.49.5
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xivContentsChapter 1313.113.213.313
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xviContentsChapter 1717.117.217.317
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xviiiContents20.620.720.820.920.102
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PrefaceJAVA AND LINUXWhy another bo
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PrefacexxiiiFREE SOFTWARE AND JAVAG
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Prefacexxvand Tyrrell Albaugh, who
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xxviiiIntroductionIf you are an exp
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xxxIntroductionThe Linux Newbie Pat
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Part IGetting Started
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4Chapter 1An Embarrassment of Riche
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10Chapter 1An Embarrassment of Rich
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2.2 Eye to Eye with vi35of their co
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2.2 Eye to Eye with vi37• L (“l
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2.2 Eye to Eye with vi39In both cas
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2.2 Eye to Eye with vi41• :7,.w!
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2.2 Eye to Eye with vi431,$s/Tryout
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2.3 Editors Galore45affected by thi
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2.3 Editors Galore47has a huge lear
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2.6 Resources49• fte is an editor
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52Chapter 3An Experienced Programme
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100Chapter 4Where Am I? Execution C
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116Chapter 5The Sun Microsystems Ja
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168Chapter 6The IBM Developer Kit f
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Chapter 7The GNU Compiler for Java(
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7.4 Compiling Our Simple Ap
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7.4 Compiling Our Simple Ap
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7.5 Options and Switches1857.5OPTIO
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7.9 What You Still Don’t Know187o
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Chapter 8Know What You Have:CVSSour
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8.2 Source Control: Whys and Hows19
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8.3 A GUI: jCVS211and the differenc
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8.4 Review213Figure 8.7 jCVS checko
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Chapter 9Ant:An IntroductionAnt 1 i
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9.3 Obtaining and Installing Ant217
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9.3 Obtaining and Installing Ant219
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9.4 A Sample Ant Buildfile221standa
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9.4 A Sample Ant Buildfile2239.4.2.
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9.4 A Sample Ant Buildfile225$ antB
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9.4 A Sample Ant Buildfile227debugI
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9.4 A Sample Ant Buildfile229Exampl
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9.4 A Sample Ant Buildfile231Runnin
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9.7 Resources233• O’Reilly has
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236Chapter 10Integrated Dev
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Chapter 11Balancing Acts:An Imagina
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11.3 How to Develop Software265soft
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11.4 What Makes a Good Requirement2
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11.6 Requirements for the Budget <s
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11.6 Requirements for the Budget <s
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11.7 Documenting, Prototyping, and
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11.7 Documenting, Prototyping, and
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11.11 Exercises277• http://www.pr
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Chapter 12Analysis and Design:Seeki
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12.4 Finding the Objects281Accounta
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12.5 Finding the Methods and Attrib
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12.6 Essential and Nonessential285
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12.7 Analysis Paralysis287• Class
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12.12 Resources28912.9CORE CLASSESS
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12.12 Resources291if (dbConn != nul
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296Chapter 13JUnit: Automating Unit
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Chapter 14Storing the DataIn this c
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14.5 Oracle, PostgreSQL, MySQL31714
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14.7 Beyond the Basics319files, and
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14.7 Beyond the Basics321Hibernate
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14.9 Setting Up PostgreSQL for Budg
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14.10 Review32514.9.4 Straight JDBC
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Chapter 15Accessing the Data:An Int
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15.3 Making Connections329These thr
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15.3 Making Connections331Example 1
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15.4 Querying Data333// queryString
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15.5 Getting Results335TIPThe case
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15.9 Resources337We haven’t cover
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Part IIIDevelopingGraphical User In
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342Chapter 16Getting in the Swing o
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378Chapter 17Other Ways: Alternativ
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Page 433: Part IVDevelopingWeb Interfaces
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488Chapter 21Introduction to Enterp
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494Chapter 22Building an EJBclasses
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496Chapter 22Building an EJBwhich,
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498Chapter 22Building an EJBExample
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500Chapter 22Building an EJBExample
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502Chapter 22Building an EJBIf you
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Chapter 23Deploying EJBsIn this cha
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23.2 Lend Me Your EAR: Enterprise P
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23.3 Deploying the EAR515automatic
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23.4 Maintaining a Distributed <str
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23.8 Resources519Ant and CVS and ho
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522Chapter 24Parting ShotsThe three
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524Chapter 24Parting ShotsPrentice
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526Appendix AASCII ChartInt Oct Hex
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528Appendix BA Java Swing GUI for B
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Appendix CGNUGeneral Public License
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C.2 Terms and Conditions for Copyin
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C.2 Terms and Conditions for Copyin
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C.3 NO WARRANTY545of this License,
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C.5 How to Apply These Terms to You
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550Index$ (dollar)in format fields,
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552Indexbreak statement, 67, 74-75b
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554IndexCVS_RSH environment variabl
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556IndexFfail(), 307false constant,
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558IndexIBM, 236, 377, 518Common Pu
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560IndexJNDI (Java Naming and Direc
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562IndexNetBeans (continued)running
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564IndexScrollBar class, 385search
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