First contact with Java EE in real sense

Why is it true that Java EE, because before, I always thought Java EE is a high-level programming language based on Java, until today I found that I have been misunderstood. This article is read Java EE Programming Technology (2nd Edition) of Reading notes, here to explain, do not involve the issue of infringement ....

Java EE is a standard middleware architecture: Unlike Java, Java EE is not a programming language, but an architecture. Java EE is a standard middleware architecture designed to simplify and standardize the development and deployment of distributed multi-tier enterprise applications.

Typical Java EE architecture applications include four tiers: the customer layer, the presentation logic layer, the business logic layer, and the enterprise Information System layer. As shown in the following:

The customer tier can be a Web browser or a desktop application.

The logical layer (Web layer), the business logic layer, are all located on the application server, and they are implemented by some Java EE standards, such as JSP, JSF, Servlet, EJB, and entity, which run on application servers that implement the Java EE standard.

The Enterprise Information System layer is mainly used for the storage management of the enterprise data, including database system, e-mail system, directory service and so on.

The implementation of the Java EE architecture can significantly improve the portability, security, scalability, load balancing and reusability of enterprise application systems.

With in-depth study, the next article will not be just some reading notes, more will be after learning their own ideas, the back will be shared with everyone.

First contact with Java EE in real sense