Enterprise application developement

Nov 20, 2017Download as PPT, PDF2 likes185 views

This document provides an overview of enterprise application development using Java. It discusses the evolution from two-tier client-server architectures to the more scalable multi-tier Java 2 Platform, Enterprise Edition (J2EE). Key components of J2EE include servlets, JavaServer Pages (JSP), and Enterprise JavaBeans (EJB) that allow developing scalable applications across tiers for clients, presentation logic, and application logic. EJBs in particular help encapsulate complex business logic and coordinate transactional work across entity beans. The document outlines the benefits of J2EE like component-based models, container services, and simplified yet flexible architectures for developing enterprise applications using Java.

Enterprise Application
Development on using Java
Presentation by: Archana Jha
Submitted by: Ms. Rani Ojha

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.

Two Tier Application
Architecture
Client Server

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

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

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

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

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

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

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

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.

Enterprise Java Beans (EJBs)
 Enterprise Java beans architecture is a component
model for development and deployment of
distributed business application.
 Entity Beans
 Represent persistent business Entity
 Persisted in storage system ( usually Database)
 Might contain Application logic intrinsic to entity
• Session Beans
 Perform work for individual clients on the server
 Encapsulate complex business logic
 Can coordinate transactional work on multiple entity
beans

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

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.

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

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Enterprise application developement

1. Enterprise Application Development on using Java Presentation by: Archana Jha Submitted by: Ms. Rani Ojha

2. 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.

3. Two Tier Application Architecture Client Server

4. 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

5. 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

6. 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

7. J2EE Features  Component based model  Container provided services  Highly Scaleable  Simplified Architecture  Flexible security model

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

9. 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

10. 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

11. 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.

12. J2EE Application Model

13. Enterprise Java Beans (EJBs)  Enterprise Java beans architecture is a component model for development and deployment of distributed business application.  Entity Beans  Represent persistent business Entity  Persisted in storage system ( usually Database)  Might contain Application logic intrinsic to entity • Session Beans  Perform work for individual clients on the server  Encapsulate complex business logic  Can coordinate transactional work on multiple entity beans

14. 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

15. 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.

16. 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

17. THANK YOU

Enterprise application developement

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