java barcode scanner api Figure 27-5: Adding tag libraries in Java

Draw Denso QR Bar Code in Java Figure 27-5: Adding tag libraries

Figure 27-5: Adding tag libraries
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Figure 27-6: Adding the TLD 5 Add your TLDs (In our case, only one is added) 6 Now you can complete the assembly of the WAR and save it 7 Next, you'll create the EAR, which again can be done using an appropriate wizard started from the assembly tool 8 We will not go through all the steps of creating the EAR; the important thing for you to remember is that the WAR needs to be loaded into the EAR in the "Adding Web Modules" step of the Wizard, shown in Figure 27-7
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Figure 27-7: Adding the WAR to the EAR 489
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9 After you have saved the EAR, exit the Application Assembly Tool and return to the Administration Console Here, you need to install the enterprise application You do this by right-clicking the Enterprise Application folder in the tree pane, and selecting the Install Enterprise Application option 10 Regenerate the Web server plug-in from within the Administration Console by right-clicking the node you are deploying on, and then selecting the Regen Webserver Plugin option This is the last step in the procedure Now the tag library, as well as the application itself, are installed on the WebSphere server and ready to go Tag Library Resources Tag libraries are relatively new on the Web application landscape, and we believe that their use will revolutionize the way we build JSPs In an ideal programming world, all JSPs will return to being what they should be just Web pages As tag library use grows among the Java development community, it will emerge as a mainstream technique and not only for internal development schemes Hopefully, developers will start using commercially available tag libraries that they buy instead of build To this end, you should be familiar with a few resources on the Web that provide good starting points for staying current on tag libraries Among them are the following sites: http://jakartaapacheorg/taglibs/ The Jakarta taglib project site is one you must be aware of One of the projects is the standard tag library (JSTL, at http://jakartaapacheorg/taglibs/doc/standard-doc/introhtml), which promises to be at least as important as the Standard Template Library is to C++ http://jsptagscom/tags/ A large collection of taglibs and pointers to other sites http://wwwtaglibcom Resources and news for JSP developers http://wwwjspincom/home/tags A collection of more than 80 tag libraries http://wwwjavaskylinecom/devhtml A collection of taglibs http://wwwjspinsidercom/indexview A collection of good resource on JSPs and taglibs
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Summary Custom tag libraries are the most important evolution of the JSP model in the past three years and they will continue to revolutionize JSP development Eventually, their use will forever change the landscape of JSP programming, and the division of work in building screens will again distinguish between Java application developers building reusable components and JSP page designers creating the actual Web pages This chapter focused primarily on how taglibs change what we do and how we do things with JSPs We now move on to 28, which discusses how servlets and JSPs can be debugged
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28: Debugging Servlets and JSPs Using VisualAge Overview The WebSphere runtime platform supports servlets and JavaServer Pages (JSPs) as a core technology You have already seen quite a few examples of how servlets and JSPs are deployed under WebSphere However, developing and debugging servlets and JSPs has been saved for this chapter While you can develop servlets and JSPs using any development environment, even using the plain old Java Developer's Kit (JDK) with TextPad or another good text editor), IBM's VisualAge for Java offers a better environment for developing servlets and JSPs VisualAge for Java has a built-in WebSphere test environment that can be activated from within VisualAge so that the program-test-debug cycle is all done from within the VisualAge Integrated Development Environment (IDE) The alternative is to build the servlets in some other Java IDE using a text editor (or build the JSP pages using a site builder), and then install them in the WebSphere environment and view the results (or try to view the results) Using VisualAge for Java, development productivity can be significantly improved The reasons for this are VisualAge's unified environment and debugging tools As you shall see, when using VisualAge for Java's WebSphere test environment, coding, running, and testing can all be completed from the IDE without ever starting up the WebSphere server or the administration tool When using WebSphere, the test-debug process is lengthy and difficult, especially if you go through the whole process of assembly and deployment for each change in your code In addition, if you are using the Enterprise Edition of VisualAge for Java, the whole issue of version control and configuration management is automatically part of the development cycle for the servlets The second advantage to using the WebSphere test environment is access to its debugging tools If you were to use another environment or editor, the only way to know what was going on would be to use a series of print commands that would need to be inspected to see what code was reached, what the variables' values were, and to compile other information When using the VisualAge IDE with the WebSphere test environment, the entire set of debugging tools are available to the servlet and JSP developer This means, for example, that you can insert breakpoints in the servlet code and have the WebSphere test environment stop at this breakpoint to allow you to perform any action that you used to do when building a plain, old Java application While today's tight coupling between WebSphere and VisualAge has a lot going for it, the trend of standardization in Java-based servers means that other IDEs will eventually become viable alternatives to using VisualAge for Java
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Developing Servlets in VisualAge VisualAge for Java offers a servlet creation wizard that's similar to the applet-creating wizard you used in 17 To invoke the Create Servlet Wizard, right-click the workspace and select Add | Servlet from the pop-up menu The wizard opens, as shown in Figure 28-1
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Figure 28-1: The Create Servlet Wizard opening screen Here, you indicate the project name, package name, and class name The new servlet is derived by default from HttpServlet, but you can change that if you need to use a different superclass You can also add import statements and specify what interfaces (other than the Servlet interface) the servlet should implement After you click Next, the wizard screen asks you to specify the Java modifiers for the new class and indicate which methods you want to implement The default selections (shown in the illustration) implement the methods init, doGet, doPost, and getServletInfo
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Click Finish, and voil ! The new servlet is ready The default implementation for both doGet and doPost calls a method called performTask, which receives the HTTP request and response objects In the spirit of our "Hello World" servlet from 4, let's add a code snippet that will produce a "Hello World" message However, in this case, you will not go through the trouble of supporting both English and French Upon inserting the new code, the performTask method looks as shown in Figure 28-2
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Figure 28-2: The performTask code snippet Obviously, all the capabilities of VisualAge for Java can be applied to developing servlets After you have defined the servlet (either manually or using the wizards), you can add or remove methods, browse the code, and perform other tasks However, the most powerful and useful feature for servlet development is the WebSphere test environment
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