By Ali Akbar
J2EE; brief for Java 2 Platform firm version. J2EE is a platform-independent, Java-centric atmosphere from solar for constructing, construction and deploying Web-based company purposes on-line. The J2EE platform involves a suite of providers, APIs, and protocols that offer the performance for constructing multitiered, Web-based purposes. many of the key positive factors and providers of J2EE: on the purchaser tier, J2EE helps natural HTML, in addition to Java applets or functions. It is determined by Java Server Pages and servlet code to create HTML or different formatted info for the customer. firm JavaBeans (EJBs) supply one other layer the place the platform's common sense is saved. An EJB server offers services akin to threading, concurrency, safety and reminiscence administration. those providers are obvious to the writer. Java Database Connectivity (JDBC), that is the Java reminiscent of ODBC, is the traditional interface for Java databases. The Java servlet API complements consistency for builders with no requiring a graphical person interface.
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WebLogic Builder, as shown in Figure 1-11, facilitates those challenges as a graphical tool used for assembling a J2EE application module, creating and editing its deployment descriptors, and deploying it to a WebLogic server. WebLogic Builder provides a visual editing environment for editing an application’s deployment descriptor XML files. You can view these XML files as you visually edit them in WebLogic Builder, but you won’t need to make textual edits to the XML files. Figure 1-11 shows how we have opened and accessed the descriptor files from within the EJB application module (EAR).
WebLogic Builder WebLogic Workshop WebLogic Workshop is an integrated development environment (IDE) that offers a GUI-based approach to developing distributed, interconnected, and loosely coupled enterprise-class Web services. With WebLogic Workshop, you can design Web services as you might draw them on paper and then add code to support the services’ functionality. You can focus on developing your service’s application logic rather than on writing code to support platform infrastructure. Figure 1-12 demonstrates the concept.
A servlet may remain in memory for subsequent client requests and may serve multiple clients; the method is merely accessed once more, without the overhead of reloading and initializing the servlet again. This significantly improves the efficiency of the server. Figure 1-6 demonstrates the structure of a typical Java servlet, where you typically hard-code HTML tags within Java program code. NOTE A Java servlet is a program that runs when the client requests specific information from the server.