J2EE名詞

What is J2EE?



The Java 2 Platform Enterprise Edition (J2EE) technology provides a component-based approach to the design, development, assembly, and deployment of enterprise applications. The J2EE platform provides the ability to reuse components in different applications. J2EE is made up of 13 different technologies including JavaServer Pages, Servlets, Enterprise JavaBeans, JavaMail, XML, JavaMail and many more. The main technologies that we will be using are:

JavaServer Pages (JSP).
Servlets
EJB




What are JavaServer Pages?



JavaServer Pages (JSP) is a technology based on the Java language and enables the development of dynamic web sites. JSP was developed by Sun Microsystems to allow server side development. JSP files are HTML files with special Tags containing Java source code that provide the dynamic content.





What are Servlets?



A Servlet is a Java class that provides special server side service. To display any information on a web page, HTML code is embedded in ?println? statements. JSP technology is an extension of Servlets. It is easier to generate GUI pages using JSP because a web page editor (such as DreamWeaver 4) can be used to create simple pages.





What are Enterprise JavaBeans?



Enterprise JavaBeans (EJB) provides a component specification for the development of scalable and secure middleware components. The EJB Server handles security and transaction management details so developers can focus on implementing the business logic.