create barcode using vb.net Developing for the web in Java

Drawer Data Matrix ECC200 in Java Developing for the web

Developing for the web
Encode ECC200 In Java
Using Barcode printer for Java Control to generate, create DataMatrix image in Java applications.
www.OnBarcode.com
Recognize ECC200 In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
12.1 How are web applications different 279 12.2 Working with tag libraries 280 12.3 Compiling JSP pages 288 12.4 Customizing web applications 292 12.5 Generating static content 297 12.6 Testing web applications with HttpUnit 299 12.7 Server-side testing with Cactus 310 12.8 Summary 315
Generate Code-128 In Java
Using Barcode maker for Java Control to generate, create Code 128 Code Set C image in Java applications.
www.OnBarcode.com
PDF-417 2d Barcode Encoder In Java
Using Barcode generation for Java Control to generate, create PDF417 image in Java applications.
www.OnBarcode.com
Web applications are an essential part of most server-side Java development. Most J2EE systems are likely to have a web application as part of the middle tier, and many other applications bypass the EJB model to become a pure web application. We are going to cover EJB development with Ant in chapter 14. Before then, we will look at the processes associated with building web applications. Many of the other chapters also cover aspects of web application development. In section 6.7, we introduced the <war> task for WAR archive creation, while in section 11.4.1 we showed how the XDoclet task could simplify web sites built with the Struts framework. The Web is integral to so many server-side applications that almost all Ant tasks find a role in building and deploying a single project.
Barcode Encoder In Java
Using Barcode generator for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
Making Data Matrix ECC200 In Java
Using Barcode creation for Java Control to generate, create Data Matrix ECC200 image in Java applications.
www.OnBarcode.com
HOW ARE WEB APPLICATIONS DIFFERENT
Code 128B Maker In Java
Using Barcode generation for Java Control to generate, create Code 128 Code Set A image in Java applications.
www.OnBarcode.com
Draw Identcode In Java
Using Barcode encoder for Java Control to generate, create Identcode image in Java applications.
www.OnBarcode.com
How is a web application different from a stand-alone server application One difference is that the programs you deploy are not stand-alone; a servlet container hosts them. This container, be it a stand-alone servlet engine or a full J2EE server, needs to know how to execute the web application. This requires a standard packaging mechanism: the WAR file, which contains your code, dependent libraries, and metadata critical for deployment. The metadata can be hand coded, or you can use Ant and its tasks to create it for you. Another key difference is that the code contained in web applications comes in different forms. As well as the basic servlet, there are JSP pages. Although you can embed Java source straight into these pages within <% %> delimiters, displaying member variables and method results using <%= %> delimiters, doing so is dangerous. It leads you down to a slippery slope of mixing the model and view, and generally increasing future maintenance issues. If you have code in the JSP pages, it stays uncompiled until someone fetches the page: errors only show after deployment. Furthermore, people with no Java skills need to edit the JSP pages; copywriters, graphic artists, and other web site designers all create pages, and they should not be exposed to Java source. Together these problems mean that the risk of scriptlet error is high, but it is not easy to find the problems early on in the build/test/deploy process. Tag libraries (taglibs) are a solution: Java classes that implement new markup tags, letting you add functionality to web pages without any Java code going into the JSP pages. In use, tags in tag libraries are very similar to Ant tasks, with the additional prefixes to distinguish tags from different libraries:
Decode DataMatrix In Visual Studio .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Print Data Matrix ECC200 In Java
Using Barcode drawer for Java Control to generate, create Data Matrix ECC200 image in Java applications.
www.OnBarcode.com
<happy:happy verbose="true" fail="true"/>
Creating Barcode In None
Using Barcode maker for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Reading Code39 In Visual C#.NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
In implementation, taglibs are portable across different containers, but they have their own deployment descriptors, which are extra development effort. If you do not make any special effort, then most of the validation of JSP pages and the XML metadata
Generating EAN128 In C#
Using Barcode creator for .NET Control to generate, create UCC - 12 image in Visual Studio .NET applications.
www.OnBarcode.com
Linear Creation In Visual C#.NET
Using Barcode maker for Visual Studio .NET Control to generate, create Linear Barcode image in VS .NET applications.
www.OnBarcode.com
web.xml struts config JSP source TLD descriptors Java source
Barcode Creation In None
Using Barcode maker for Software Control to generate, create Barcode image in Software applications.
www.OnBarcode.com
UCC-128 Drawer In None
Using Barcode maker for Office Word Control to generate, create EAN / UCC - 13 image in Microsoft Word applications.
www.OnBarcode.com
<javac> <war>
Barcode Creation In Java
Using Barcode printer for Eclipse BIRT Control to generate, create Barcode image in BIRT applications.
www.OnBarcode.com
EAN / UCC - 13 Maker In Objective-C
Using Barcode generation for iPhone Control to generate, create EAN-13 Supplement 5 image in iPhone applications.
www.OnBarcode.com
Error in java source
Painting DataMatrix In Java
Using Barcode drawer for BIRT Control to generate, create DataMatrix image in BIRT applications.
www.OnBarcode.com
EAN13 Maker In Java
Using Barcode generator for BIRT reports Control to generate, create EAN13 image in BIRT reports applications.
www.OnBarcode.com
deploy
Error in web.xml, TLD or struts config
fetch JSP pages
Error or bug in JSP page
test servlets
Bug in servlet
Figure 12.1 A web application development process
HOW ARE WEB APPLICATIONS DIFFERENT
you have to write only takes place server side. For example, you have to deploy to a server and then remember to retrieve changed JSP pages to see if the changes generate Java source that compiles. This process may work as you begin a project, but as the number of pages increases, it soon becomes unworkable. Figure 12.1 shows the typical development process of a web application. In this manual process, there are too many files that developers create by hand files only validated during and after deployment. We need to automate the tests, run them earlier in the process, and stop writing so many deployment descriptors. Our new development process will look like figure 12.2:
Copyright © OnBarcode.com . All rights reserved.