J2EE TECHONOLOGY

Prepared By:Govind Singh

Branch: Computer ScienceRoll No. : 2010UCS016

Training Location :Hewlett-Packard Education Services,

Jaipur

About HPES

• HP is the largest IT solution and UNIX training company worldwide.

• HP has been in the education business for over 30 years.

• HP is having more than 400 education centers worldwide.

Content

Introduction to J2EE Servlet JSPs MVC Architecture Introduction to Structs 1.3 Framework

Introduction To J2EE

• J2EE is java’s Enterprises Edition that interfaces and provide platform for different technologies.

• J2EE defines a model for developing multi-tier, web based enterprises applications.

Two Tier Architecture

• Client can view output in the Browser• Server having both Web Server and Database

Server.

Client Server

Three Tier Architecture

• Business Logics and Database Logics has been separated.

• It is adopted by J2EE.

client app server server

7

Three Tier architecture(Cont..)

Web Logics

Web Server (Tomcat, JBoss)

Browser(IE, Firefox,

Opera)

Desktop (PC or MAC)

Database

Database Server

SQLHTTP

HTML tablesvision

touch

Presentation Layer

Application Layer

PersistenceLayer

Servlet

• Servlets are java codes having HTML inside.• Servlets are better then CGI

Output

Source Code

CGIBased

Webserver

CGIBased

Webserver

Request CGI1Child for CGI1

CGIBased

Webserver

Servlet Based Webserver

JVM

Request CGI1Child for CGI1

Request Servlet1

CGIBased

Webserver

Servlet Based Webserver

JVMServlet1

Request CGI1Child for CGI1

Request CGI2

Request Servlet1

CGIBased

WebserverChild for CGI2

Servlet Based Webserver

JVMServlet1

Request CGI1Child for CGI1

Request CGI2

Request Servlet1

Request Servlet2

CGIBased

WebserverChild for CGI2

Servlet Based Webserver

JVMServlet1

Servlet2

Request CGI1Child for CGI1

Request CGI2

Request CGI1

Request Servlet1

Request Servlet2

CGIBased

WebserverChild for CGI2

Child for CGI1

Servlet Based Webserver

JVMServlet1

Servlet2

Request CGI1Child for CGI1

Request CGI2

Request CGI1

Request Servlet1

Request Servlet2

Request Servlet1

CGIBased

WebserverChild for CGI2

Child for CGI1

Servlet Based Webserver

JVMServlet1

Servlet2

Request CGI1Child for CGI1

Servlet vs. CGI

Servlet Working

Client Server

Request

Response

HelloServlet.java

helloServlet.class

Read

Generate

Servlet

Client

ServerServletcontainer

HttpRequest

thread

requestresponse

Servlet(cont…)

Servlet Working

2

3

1

4

5

6

JSP(Java Serve Page)

• JSP is HTML having Java Code inside it.

Java

Cod

e HTM

L

JSP

JSP(Java Server Page)

Client Server

Request

Response

Hello.jsp

helloServlet.class

helloServlet.java

Read

Generate

Execute

MVC Architecture

• The model is logical backbone of the application.

• The view (presentation) is responsible to display the data provided by the model in a specific format

• The controller handles the model and view layers to work together

MVC Architecture

Displa

y to

use

rs

Combine view and model

Perform logics

& manage data

Struts History

• Created in 2000 by Craig R. McClanahan

• Donated to ASF(Apache Software Foundation) in 2000

• Current stable release: 2.3

Struts 1.3.x Framework

• Apache Struts is a platform activity.• Composable Request Processor( for SSLEXT configuration)• Supports Serialization• "Extends" attribute• "isCommitted" Exception Handling• Postback Actions• Wildcard ActionConfig properties

Struts Directory Structure