Pro J2EE 1.4: From Professional to Expert by Sue Spielman, Meeraj Kunnumpurath, Neil Ellis, Visit

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This bankruptcy has coated loads of floor. After interpreting it, you'll have a radical realizing of the recent positive factors to be had within the JSP 2.0 specification. We coated what you want to be aware of to put in writing your individual customized activities, despite which imple­ mentation you decide. customized activities are helpful for developing reusable JSP compo­ nents. New within the JSP 2.0 specification are the notions of tag documents and JSP fragments. those are easy how one can create customized activities with no need to grasp easy methods to write Java. they supply a mechanism for web page authors to create their very own customized tag libraries with out the fear of getting to put in writing complex Java code. utilizing tag documents offers a mechanism for getting rid of writing TLD records because the JSP box gener­ ates implicit TLD records for them. there is additionally a versatile mechanism in position for packag­ ing and deploying tag libraries in JSP 2.0. you can also write vintage activities utilizing many of the interfaces to be had. those contain the next: • Tag • BodyTag • IterationTag one other function brought during this bankruptcy used to be the hot JSP 2.0 basic Tag interface, which has a miles easier lifestyles cycle outlined than the vintage tag interfaces. easy Tag enables the entire energy of cooperating and generation tags with much less difficulty within the coding. different new good points contain utilizing dynamic attributes in activities that permit tag handlers to simply accept attributes that have not been declared in a TLD.

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Select index. j sp, and click the Add button. You should now see index. j spin the contents tree at the bottom of the dialog box. Click the OK button to close this dialog box. Click the Next button to go to the next page of the wizard (see Figure 1-7). , 11-. ,,.... . _ ... --htypool--. COIIIPOIIM't Wyou CIO notnooG I l l - ..... n$olt o ... ~ Figure 1-7. 4 9. J2EE has several different kinds of components. This particular application includes a JSP component, and this is where you tell Deploytool what kind of component you're building.

These benefits include the following: • It's easy to learn, and it provides a wide range of functionality. • JSP authors and JSP authoring tools can easily generate pages on all compliant JSP containers using standard tags. 32 Understanding Web Applications • Standard tags created by the expert group will meet the needs of a wide variety of communities. • The tags will already be well tested and ready for use. • 'fraining costs are lower because you can use targeted training materials. • It offers simplified portability and maintainability of JSP pages and applications.

The action gets any information out of the request necessary to perform the desired business logic and then passes it along to the appropriate helper class. Control is then usually forwarded back through the Controller. The Controller then dispatches to the appropriate View. You can determine the destination of the forwarding by consulting a set of mappings, usually loaded from a database or configuration file. This provides a loose coupling between the View and Model that can make an application significantly easier to create and maintain.

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