The Persistence Tier in Java

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CHAPTER 9 The Persistence Tier
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public void save(League newLeague) { } public Game findGame(long id) { return null; } public Location findLocation(long id) { return null; } public Team findTeam(long id) { return null; } public Player findPlayer(long id) { return null; } }
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2 Modify the session bean that was previously created (see the Iteration 2: Developing Session EJBs section in 8) Change LeagueFacade to use the CMP DAO just created This change will be transparent to the business and presentation tiers Open the session bean class named comleagueplanetejbLeagueFacadeBean in the Java editor and find the line in the ejbCreate method where the DAO is set Replace it with the singleton from the new IceHockeyCMPDAOImpl class (see Example 912)
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Example 912 Modified Listing of the LeagueFacadeBean ejbCreate Method
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/** * @ejbcreate-method view-type="remote" **/ public void ejbCreate() { LeagueFacadeImpl facadeImpl = new LeagueFacadeImpl(); // point the facade at the dao for the ice hockey league LeagueDAO dao = IceHockeyCMPDAOImplgetLeagueDAO(); facadeImplsetLeagueDAO(dao); leagueFacade = facadeImpl; // Reference to the old facade implementation //leagueFacade = IceHockeyFacadegetLeagueFacade(); }
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Testing the CMP Implementation
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Next, test the CMP-based persistence tier using the LeaguePlanetWeb Web application:
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Iteration 3: Entity Beans
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1 Open the Web application Right click on the schedulejsp file and invoke the Run As Run on Server menu item The browser should display the same games (see Figure 914) The only difference is that the games were read using the new CMP 2 Next, you will add new games to the schedule To do this you will use a servlet to insert the new games in the database using your CMP Create a new servlet named GameServlet in the LeaguePlanetWeb project You will use this servlet to process an HTTP request coming from an HTML form named gameFormhtml You will need to define a servlet URL mapping in webxml that directs requests sent with URI /GameServlet to this servlet Use the New Servlet wizard as before to create the GameServlet class (see Figure 924)
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Figure 924 Create Servlet
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CHAPTER 9 The Persistence Tier
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3 Now add code to your servlet to get the form data from the request and call the CMP to create a new game The EJB container will automatically save the game to the database Finally, forward the response to schedulejsp Make sure that the code for your servlet looks like that shown in Example 913
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Example 913 Listing of GameServletjava
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package comleagueplanetservlet; import import import import javaioIOException; javasqlDate; javasqlTime; javatextSimpleDateFormat;
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import javaxservletServletException; import javaxservlethttpHttpServletRequest; import javaxservlethttpHttpServletResponse; import comleagueplanetcmpGameUtil; /** * Servlet implementation class for Servlet: GameServlet * * @webservlet name="GameServlet" display-name="GameServlet" * * @webservlet-mapping url-parrern="/GameServlet" */ public class GameServlet extends javaxservlethttpHttpServlet implements javaxservletServlet { /* * (non-Java-doc) * * @see javaxservlethttpHttpServlet#HttpServlet() */ public GameServlet() { super(); } /* * (non-Java-doc) * @see javaxservlethttpHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { SimpleDateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy"); SimpleDateFormat timeFormat = new SimpleDateFormat("hh:mm aaa"); Date date = new Date(dateFormatparse(requestgetParameter("date")) getTime());
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Iteration 3: Entity Beans
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Time time = new Time(timeFormatparse(requestgetParameter("time")) getTime()); String arena = requestgetParameter("arena"); String home = requestgetParameter("home"); String visitor = requestgetParameter("visitor"); String homeScore = requestgetParameter("homeScore"); String visitorScore = requestgetParameter("visitorScore"); GameUtilgetLocalHome()create(1,date, time, arena, home, visitor, homeScore, visitorScore); thisgetServletContext()getRequestDispatcher("/schedulejsp") forward(request, response); } catch (Exception e) { eprintStackTrace(); } } }
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4 In the WebContent folder, create an HTML file named gameFormhtml and code a game data entry form in it (see Example 914) You will use this HTML form to submit game creation requests to the GameServlet
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Example 914 A Simple Game Form
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 401 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <form action="/LeaguePlanetWeb/GameServlet" method="post"> <h1>Add a new game</h1> <table> <tr> <td>date</td> <td><input type="text" name="date"></td> </tr> <tr> <td>time</td> <td><input type="text" name="time"></td> </tr> <tr> <td>arena</td> <td><input type="text" name="arena"></td> </tr> <tr> <td>home</td> <td><input type="text" name="home"></td> </tr>
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CHAPTER 9 The Persistence Tier
<tr> <td>visitor</td> <td><input type="text" </tr> <tr> <td>home score</td> <td><input type="text" </tr> <tr> <td>visitor score</td> <td><input type="text" </tr> <tr> <td colspan="2"><input </tr> </table>