J2EE and Servlet

INDUSTRIAL TRAINING
Overview Of J2EE & SERVLET

INDUSTRIAL TRAINING
Past History
 Initially two tier architecture (client
server applications)
 Client is responsible for data access
applying business logic and
presentation of data
 Only service provided by Server was
that of database server.

INDUSTRIAL TRAINING Two Tier Application
Architecture
Client Server

INDUSTRIAL TRAINING Two Tier Application
Architecture
 Drawbacks
- Easy to deploy but difficult to enchance
or upgrade.
- It makes reuse of business and
presentation logic difficult
- Not scalable and not suited for internet

INDUSTRIAL TRAINING Java 2 Platform Enterprise
Edition(J2EE)
J2EE is an architecture for implementing
enterprise class applications using Java
and Internet Technology
- Solves problems of two tier architecture

INDUSTRIAL TRAINING
J2EE
 To develop n tier application
 It supports the development of a
variety of application types
 small client server systems
 Systems running on Intranets
 Systems on large scale internet e-commerce
site

INDUSTRIAL TRAINING
J2EE Features
 Component based model
 Container provided services
 Highly Scaleable
 Simplified Architecture
 Flexible security model

INDUSTRIAL TRAINING
Java: Foundation for J2EE
 J2EE is an application of java
 Write once and deploy the code into
any platform

INDUSTRIAL TRAINING
J2EE Components & Services
 Primary technologies
- Servlets
- JavaServer Pages (JSP)
- Enterprise JavaBeans (EJB)
 Standard services & supporting technologies
- Java database connectivity(JDBC) data access API
- Remote Method Invocations (RMI)
- Extensible Markup Languages(XML)
- JavaIDL
- JavaMail

INDUSTRIAL TRAINING
J2EE Tiers
 Client Presentation
 HTML or Java applets deployed in Browser
 XML documentations transmitted through
HTTP
 Java clients running in Client Java Virtual
Machine (JVM)
• Presentation Logic
 Servlets or JavaServer Pages running in
web server
• Application Logic
 Enterprise JavaBeans running in Server

INDUSTRIAL TRAINING
J2EE Application Model
 Browser is able to process HTML and
applets pages.
 It forwards requests to the web server,
which has JSPs and Servlets
 Servlets and JSPs may access EJB
server.
 Java Standalone runs on java client,
which access EJB server using RMI.

INDUSTRIAL TRAINING
J2EE Application Model

INDUSTRIAL TRAINING
Overview of Servlets
 Are container managed web components
 Replace Common Gateway Interface(CGI) or
Active Server Pages (ASP)
 Generate dynamic response to requests from
web based clients
 Synchronize multiple concurrent client
request
 Serve as client proxies

INDUSTRIAL TRAINING
Servlet Operation
 Server is Java program that runs as
separate thread inside servlet container.
 Servlet container is part of web server
 It interact with web client using
response request paradigm

INDUSTRIAL TRAINING
JavaServer Pages (JSP)
 Text based documents describe how to
process a request and create a
response
 Contains HTML or XML and other JSP
elements defined by JSP specification.
 Are Installed on web server
 are web components that sits on top of
java servlet mode.

INDUSTRIAL TRAINING
JSP Advantages
 Performance
 Runtime characteristics of servlets
 Automatic recompilation of modified pages
 Server side processing
 Programming
 Emphasize use of reusable components
 Write Once , Run Anywhere properties
 Extensible through custom tag libraries
 Provides front end access mechanism to
EJBs

INDUSTRIAL TRAINING
Parts of JSP Pages
Directive
<%@ pageimport=“java.util.”, MVCApp.Cart, MVCApp.CartItem” %>
Declaration
<%! Iterator it = null; CartItem ci = null; Vector cpi = null;%>
Raw HTML
<html><head><title>Shopping Cart</title></head></html>
Action
<jsp:usebean id =“Cart” scope = “session” class = “MVCApp.Cart”/>
Scriplets
%
Cpi = cart.getCartItems ( );
it = cpi.iterator();
While (it.hasNext()){ci= (Cart Item)it.next();
%>

INDUSTRIAL TRAINING
Parts of JSP Pages
 Expression
<td<% = ci.getTitle() %></td>
<td align =“right”><%=ci.getQuantity()%></td>
 Implicit Objects
<% string action = request.getParameter(“action”) ; %>

INDUSTRIAL TRAINING
Conclusion
THANK------YOU

J2EE and Servlet

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