AJ.pptx

SARVAJANIK COLLEGE OF ENGINEERING AND TECHNOLOGY
COMPUTER ENGINEERING DEPARTMENT
B. E. III, CO – M, 6th Semester
ALA Presentation
On
“J2EE”
Subject Name : Advanced Java (2160707)
Prepared and Presented by (Group No. : 18)
SUVRA KANTI MANDAL(160420107065)
DITIRO RANKO(160420107068)
SYADA SARA ENAM ROJA(160420107069)
Guided by:
Prof. Bhavesh Patel
Prof. Vandana Joshi

Presentation Overview
• Introduction to J2EE
• 2-tier Architecture
• J2EE
• J2EE features
• J2EE Components
• J2EE Application Model
• Servlet
• JSP
2

Past History
• Initially two tier architecture (client server applications)
• Client is responsible for data access applying business logic a
nd presentation of data
• Only service provided by Server was that of database server.
3

Two Tier Application Architecture
Client Server
4

Two Tier Application Architecture
• Drawbacks
- Easy to deploy but difficult to
enhance or upgrade.
- It makes reuse of business and
presentation logic difficult
- Not scalable and not suited for
internet
5

Java 2 Platform Enterprise Editio
n (J2EE)
J2EE is an architecture for implementing enterprise class a
pplications using Java and Internet Technology
- Solves problems of two tier architecture
6

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 Java Server Pages running in web server
• Application Logic
Enterprise JavaBeans running in Server
7

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
8

J2EE Features
• Component based model
• Container provided services
• Highly Scalable
• Simplified Architecture
• Flexible security model
9

J2EE Components & Services
• Primary technologies
- Servlets
- Java Server 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
11

J2EE Application Model
• Browser is able to process HTML and applets pages.
• It forwards requests to the web server, which has JSPs and Se
rvlets
• Servlets and JSPs may access EJB server.
• Java Standalone runs on java client, which access EJB server
using RMI.
13

States and Persistence
• Session beans can be
• Stateless- belong to client for duration of a method call
• Stateful- belong to client for duration of client conversation
• Entity beans can have
• Bean-managed persistence- The developer writes SQL code to retrieve
, store and update database
• Container managed persistence- The developer provide database mapp
ing information that allows the container to manage persistence
14

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 client
s
• Synchronize multiple concurrent client request
• Serve as client proxies
15

Servlet Operation
• Server is Java program that ru
ns as separate thread inside ser
vlet container.
• Servlet container is part of we
b server
• It interact with web client usin
g response request paradigm
16

Sample Servlet
import java.io.*; //Apache Tomcat sample code
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloWorld extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, Servlet
Exception
{
response.setContentType("text/html");
PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<body>");
out.println("<head>");
out.println("<title>Hello World!</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Hello World!</h1>");
out.println("</body>");
out.println("</html>");
}
}
17

Java Server 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.
18

JSPAdvantages
• 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
19

Sample JSP
<html> <!- Apache Tomcat Samples ->

<body bgcolor="white">
<jsp:useBean id='clock' scope='page' class='dates.JspCalendar' type="dates.JspCalendar" />
<font size=4><ul>
<li> Day of month: is <jsp:getProperty name="clock" property="dayOfMonth"/>
<li> Year: is <jsp:getProperty name="clock" property="year"/>
<li> Month: is <jsp:getProperty name="clock" property="month"/>
<li> Time: is <jsp:getProperty name="clock" property="time"/>
<li> Date: is <jsp:getProperty name="clock" property="date"/>
<li> Day: is <jsp:getProperty name="clock" property="day"/>
<li> Day Of Year: is <jsp:getProperty name="clock" property="dayOfYear"/>
<li> Week Of Year: is <jsp:getProperty name="clock" property="weekOfYear"/>
<li> era: is <jsp:getProperty name="clock" property="era"/>
<li> DST Offset: is <jsp:getProperty name="clock" property="DSTOffset"/>
<li> Zone Offset: is <jsp:getProperty name="clock" property="zoneOffset"/>
</ul>
</font>
</body>
</html>
20

J2EE Servers
•Application Server
• As of Sept ’01 - MetaGroup Survey by sales $$
• BEA Weblogic - 37%
• IBM Websphere – 22%
• Oracle – 11%
• Iplanet – 5%
• Other- 12%
• Open-source
• Jboss – www.jboss.org
• Sun’s listing of J2EE compatible servers - http://java.sun.com/j2
ee/compatibility.html
21

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