JavaEE describes the configuration and environment
JavaEE Profile
- 3 version of the Java technology family
- JavaSE: Java Standard Edition, Java Standard Edition technology to interface program, Java applets and some other typical applications for the goal.
- JavaEE: Java Enterprise Edition, Java Enterprise Edition technology to the server and enterprise software development as the goal.
- JavaME: Java Micro Edition, Java Micro Edition technology for small devices, stand-alone devices, mobile internet devices, embedded devices program development and design.
JavaEE features
- It used to develop the program N layer structure:
- The simplest model of software development, is a stand-alone form.
- "Fat client" development model: each client can run applications on top of each client access to server-side database.
- The client uses a browser, then even the presentation logic can be stored on the server side, known as the "thin client."
- JavaEE is an open standards-based platform
- JavaEE is not a technology, but a series of technical standards.
- JavaEE, the business logic has nothing to do with the work can be handed over to the middleware vendors to complete, developers can concentrate on how to create business logic, accordingly shorten the development time and improve the overall deployment flexibility.
JavaEE technology structure
JavaEE three-tier structure:
- Running on the client machine client layer components. The client application and Applets, client layer components, they may directly access the database.
- Web-tier components run on the JavaEE server. Java Servlet and Java Server Pages (ESP) is a Web-tier components, they can also access the database, Web container running in the server's.
- Run the business logic components on the JavaEE server. Enterprise JavaBeans (EJB) business layer components, can access the database, EJB containers running on the server.
