The J2EE platform comprises of J2EE services, protocols, components and (API) Application Programming Interfaces. Functionality is being provided by J2EE to develop distributed and multi-tiered Web based applications. A J2EE component is considered to be a functional and self contained software unit which has been assembled to J2EE application, along with related files and classes, to do communication with other components. Following components are present in J2EE.
Updated 01-15-2012 at 07:29 AM by J2EE
This post briefly explains the 5 tiers in Java Enterprise Edition.
A web browser, a hand held device or an application which remotely accesses the services of an enterprise application are examples of a Client tier. In other words a Client tier can consists of all the types of components that are clients of an enterprise application.
Filters, Java Servlets, JavaServer Pages, JavaBeans and other utility classes
Apache Struts is a free open-source framework for creating Java web applications. In this post, I will write about Apache Struts.
In a standard Java EE web application, the client will typically submit information to the server via a web form. The information is then either handed over to a Java Servlet which processes it, interacts with a database and produces an HTML-formatted response, or it is given to a JavaServer Pages (JSP) document which intermingles HTML and Java code to