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CHAPTER 3 Quick Tour
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the Web browser, with the error message prompting the user to enter a user id (see Figure 324)
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Figure 324 Web Browser login-userjsp
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4 Do a little testing now If you click on the Login button, control is passed back to the servlet, which generates the error message again and forwards the request back to login-userjsp This time enter a user id and click Login Now the servlet forwards control to hello-worldjsp
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Summary of Iteration 2
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In this iteration you created and debugged a servlet that controlled the presentation logic of your Web application For simple Web applications, you can code this logic manually However, for complex applications, you should consider using a Web application framework, such as JSF, Struts, or Spring MVC In Struts, the control flow logic is externalized into an XML configuration file so that you can easily modify it Struts also provides a framework for many
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Iteration 3: Database Access
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common Web application programming tasks, such as parameter passing and error handling Although Struts enjoys widespread popularity among Java Web application developers, it is not part of J2EE The ideas behind Struts have been standardized in JSR 127: Java ServerFaces, which is now part of Java EE 5 WTP 15 includes the JavaServer Faces Tools incubator subproject, which will become a component of JST in WTP 20
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Iteration 3: Database Access
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Virtually every Web application takes input from users and stores it on the server Relational databases are by far the most popular technology for storing data XML promises to become another popular storage format since it is more convenient for semi-structured data than relational tables In fact, relational databases are now being updated to store and query XML data XML data can be queried using SQL extensions, XPath, XSLT, and the new XML query language, XQuery We ll discuss XML more later in s 7 and 10, but for now we ll focus on relational databases You ll extend your Web application by adding some very simple database access Rather than greet users by their user id, you ll update your application to greet users by their full names You ll create a relational database to store a table of full names, and you ll develop a Java class to access the database using JDBC You ll develop the SQL query using the Data tools in WTP The Data tools in WTP use JDBC to access databases WTP has out-ofthe-box support for many databases and, with a little Eclipse plug-in development effort, others can be added Virtually all databases have JDBC drivers, so you have lots of choices available, but for purposes of illustration you ll use Apache Derby Derby is very suitable for development with WTP because it is Open Source, pure Java, and can be embedded easily in Web applications If you have another supported database already installed, feel free to use it Just modify the following instructions accordingly Getting Derby If you d like to use Derby, download it from
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http://dbapacheorg/derby/derby_downloadshtml
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The Derby project has packaged the code as an Eclipse plug-in, so download that and install it in your Eclipse directory We use version 10121 here You can download the zip file
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CHAPTER 3 Quick Tour
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derby_core_plugin_1012zip
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from
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http://apachemirror99com/db/derby/db-derby-10121/
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To install Derby, exit from Eclipse, unzip the plug-in into your eclipse installation directory (see Figure 325), and then restart Eclipse Note that when you exit Eclipse, WTP will automatically stop any of your running servers
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Figure 325 Derby Plug-In
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You ll perform the following development tasks in this iteration: 1 Connect to a Database 2 Execute SQL Statements 3 Add Database Access to a Web Application Refer to 9 for more detail
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Connect to a Database
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Add a database connection to your project as follows:
Iteration 3: Database Access
1 WTP provides two views for working with databases: Database Explorer and Data Output The Database Explorer view lets you connect to databases and examine their contents The Data Output view lets you see the results of executing SQL statements on a database Add these views to the J2EE perspective as follows: a Invoke the Window Show View to open the Show View dialog Other command from the menu bar
b Expand the Data category (see Figure 326), select the Database Explorer and Data Output views, and click the OK button