Chapter 5: Web Application Architecture and Design

1
Chapter 5Web Application Architecture and
Design
Reference Eclipse WTP
2
Objectives

• Web Applications
• MVC for the Web
• Java Application Frameworks
• Service-Oriented Architecture
• Case Study League Planet

3
Simple Web Applications
4
Distributed Multi-tiered Applications
J2EE Web Tier and Business Tier can run on
separate application servers
Source Java EE 5 Tutorial Chapter 1
5
J2EE Containers
Client-side Presentation
Server-side Presentation
Server-side Business Logic
Enterprise Information System
Source Java EE 5 Tutorial Chapter 1
6
MVC of the Web
7
Java Application Frameworks

• Examples
• Struts, JSF, Spring, Beehive, Hibernate
• Pros
• Can simplify development of Java Web Applications
• Can improve testability and maintainability
• Cons
• Framework may not be up-to-date
• Especially when it is no longer popular
• May require lots of work when migrating
• E.g., migrating from Apache Struts to JSF

8
Service-Oriented Architecture (SOA)
Makes application interoperable via UDDI, WSDL,
etc.
9
League Planet Case StudyService Layer Design
10
League Planet Case Study

• Presentation Layer
• JSP pages
• Controller Layer
• Servlets
• Service Layer
• Java Interface/Implementation, EJB Session
  (Façade), Web Services
• Model Layer
• Java Objects (POJO), EJB Entity Bean
• Persistence
• SQL (RDBMS)