By James L. Weaver
This booklet is aimed toward programmers who've realized the fundamentals of Java from, for instance, starting Java 1.4: From beginner to specialist, and are actually able to methods to use Java within the genuine global, with J2EE. yet, J2EE is a huge spec, and the objective viewers isn't attracted to company JavaBeans and different complex specifications inside of J2EE. actually, seventy five% of J2EE functions are outfitted utilizing simply JavaServer Pages and Servlets (two of the easier applied sciences to profit in J2EE), so those are the components that the viewers is very drawn to.
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Additional info for Beginning J2EE 1.4: From Novice to Professional (Apress Beginner Series)
The application developer creates components, which are hosted by the J2EE containers. Containers play a central theme in the J2EE architecture. Servlets are one type of J2EE web component. They are Java classes that are hosted within, and invoked by the J2EE server by requests made to, a web server. These servlets respond to those requests by dynamically generating HTML, which is then returned to the requesting client. JavaServer Pages (JSPs) are very similar in concept to servlets, but differ in that the Java code is embedded within an HTML document.
Start up the J2EE server if it’s not already running, by following the instructions given above. 4. Start the J2EE Deployment Tool application that comes with the J2EE SDK. This tool is a utility that is used to assemble application components into distributable archives, and also to distribute the application to the J2EE server. 4 SDK | Deploytool When the Deployment Tool has finished initializing, you’ll see its main window: 5. 34 We need to create a new Web Archive (WAR). A WAR file is an archive file that will contain the web components of a J2EE application, along with a descriptor or “table of contents” that describes what is in the archive.
The servlet itself is managed and invoked by the J2EE servlet container. Servlet interface service method to satisfy the request. qxd 15/1/04 7:28 pm Page 14 Chapter 1 If you’ve done any web application programming using CGI (common gateway interface), you’ll be familiar with the limitations of that mechanism including lack of portability and no intrinsic support for session management (a much-overused example is the ability to maintain a list of items in a virtual shopping cart). If you’ve not done any development using CGI, consider yourself lucky and take my word for it—life with J2EE is a whole lot better!
Beginning J2EE 1.4: From Novice to Professional (Apress Beginner Series) by James L. Weaver