Building Web Application Using Spring Framework

Building Web Application Using Spring Framework
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www.edureka.co/spring-framework
At the end of this module, you will be able to understand:
Objectives
Introduction to Spring and its Architecture
Dependency Injection
Spring MVC Architecture
Exception Handling With Spring MVC
Build a Web Application using Spring

In Java technology there are many frameworks that helps the programmers to easily build complex applications
You can choose these frameworks for building your applications
Example:
» Hibernate  Database access mechanism
» Struts  Web Layer
» EJBs  Services like transactions, security & messaging
» Log4J  Logging
Java Frameworks!!!

Problem:
» Applications that use the varied frameworks and services are difficult to maintain as they grow
Need:
» Applications that use a number of frameworks and services have to remain maintainable
» Codes should be loosely coupled with the frameworks so that testing and reusability becomes easy
Java Frameworks!!!

Spring Framework provides a light-weight solution to develop maintainable and reusable enterprise applications
It provides very simple and rich facilities to integrate various frameworks, technologies and services in the
application
Spring Framework!!!

AOP Aspects Instrumentation
Test
JDBC ORM
OXM JMS
Transactions
Web Servlet
Portlet Struts
Beans Core Context
Expression
Language
Core Container
WEB (MVC/Remoting)Data Access/Integration
Spring Framework Runtime
Spring Architecture

Dependency Injection
Spring XML
Object
Spring
Bean
Spring
Bean
Bean Factory

Objects created by the container are also called managed objects or beans
The container can be configured by loading XML files or detecting specific Java annotations on configuration classes
Central to the Spring Framework is its inversion of control (IoC) container, which provides a consistent means of
configuring and managing Java objects
The container is responsible for managing object lifecycles of specific objects: creating these objects, calling their
initialization methods, and configuring these objects by wiring them together
Dependency Injection

There are two ways to perform Dependency Injection :
Setter Method Dependency Injection(DI) - In this type of DI the required bean is injected through setter method
for that bean
Constructor Dependency Injection(DI) - In this type of DI the required bean is injected through the constructor
argument
Types of Dependency Injection

Model-View-Controller architecture is used for interactive web-applications. This model minimizes the coupling
between business logic and data presentation to web user. This model divides the web based application into three
layers:
» Model: Model domain contains the business logics and functions that manipulate the business data. It
provides updated information to view domain and also gives response to a query. And the controller can
access the functionality which is encapsulated in the model
» View: View is responsible for presentation aspect of application according to the model data and also
responsible to forward query response to the controller
» Controller: Controller accepts and intercepts user requests and controls the business objects to fulfil these
requests. An application has one controller for related functionality. Controller can also be depends on the
type of clients
Model-View-Controller (MVC)

MVC
View Model
Controller
UI Logic Business Logic
Request & Relay Data

Spring MVC

Setting Up Spring MVC

Spring MVC provides a great way to handle exceptions and errors
@ExceptionHandler annotation is core to this feature
For each Spring controller we can simply define a method that automatically gets called if a given exception occurs
So any error resulting in ClassNotFoundException will lead to classNotFoundError.jsp page rather than displaying the
error logs to user.
Exception Handling with Spring MVC

One of the shortcomings of @ExceptionHandler is it only handles exception getting raised from the controller where
it is defined. It will not handle exceptions getting raised from other controllers
Now this will take care of ClassNotFoundException thrown from any controller and will show classNotFoundError.jsp
page
@ControllerAdvice

Building a Web Application Using Spring

Spring - Job Trends

LIVE Online Class
Class Recording in LMS
24/7 Post Class Support
Module Wise Quiz
Project Work
Verifiable Certificate
Slide 18 www.edureka.co/spring-framework
How it Works?

 Module 1
» Introduction to Spring
 Module 2
» Spring Configurations
 Module 3
» Aspect Oriented Programming and DAO
 Module 4
» Data Access
 Module 5
» Spring Web
 Module 6
» Integrating Struts 2, JSF with Spring, Spring
Web Flow
 Module 7
» Spring Security
 Module 8
» Spring Integration
Course Topics

Questions
Slide 20 www.edureka.co/spring-framework

Building Web Application Using Spring Framework

Building Web Application Using Spring Framework

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