Introduction to Spring Framework

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Presentation By Ramananda M.S Rao

ContentContentIntroduction MVC Architecture Spring Configuration Get Started Dependency Injection The Spring Container(IOC) and API Spring and Hibernate Integration Spring AOP Transaction Management Spring Data ValidationAdvanced techniquesSpring Controllers and AjaxRestful Web Services

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ContentRemoting and clustering Spring Security Java Message Service (JMS)JMXSpring OXM(Object XML Mapping) Test-driven DevelopmentFuture ExplorationSpring Best PracticesProjectAbout Us

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Introduction Spring framework makes the easy development of JavaEE

application. Spring is a lightweight framework. It can be thought of as a

framework of frameworks because it provides support to various frameworks such as Struts, Hibernate, Tapestry, EJB, JSF etc.

Spring framework comprises several modules such as IOC, AOP, DAO, Context, ORM, WEB MVC etc.

Spring framework was initially written by Rod Johnson and was first released under the Apache 2.0 license in June 2003.

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Spring MVC Architecture Spring MVC helps in building flexible and loosely coupled web

applications. The Model-view-controller design pattern helps in separating the

business logic, presentation logic and navigation logic. Models are responsible for encapsulating the application data. The Views render response to the user with the help of the model

object. Controllers are responsible for receiving the request from the user

and calling the back-end services.

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Get Started Step 1 - Create Java Projectcreate Helloworld.java and Main.java files under the com.collaba.helloworld package.

Helloworld.javapackage com.collaba.helloworld;public class Helloworld { private String message; public void setMessage(String message){

this.message = message; }

public void getMessage(){ System.out.println("Your Message : " + message); }

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Get Started Main.javapackage com.collaba.helloworld;import org.springframework.context.ApplicationContext;Importorg.springframework.context.support.ClassPathXmlApplicationContext;public class Main {

public static void main(String[] args) { ApplicationContext context = new

ClassPathXmlApplicationContext("Beans.xml");Helloworld obj = (Helloworld) context.getBean("helloWorld"); obj.getMessage();

}}

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Get Started Step 2 - Create Bean Configuration Filecreate a Bean Configuration file which is an XML file and acts as cement that glues the beans ie. classes together. This file needs to be created under the src directory as shown below:<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><bean id="helloWorld" class="com.collaba.helloworld.Helloworld"> <property name="message" value="HELLO WORLD!"/> </bean></beans>

Step 3 - Running the ProgramIf everything is fine with your application, this will print the following message in Eclipse IDE's console.

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Autowiring in Spring Autowiring feature of spring framework enables you to inject the object dependency

implicitly. It internally uses setter or constructor injection. Autowiring can't be used to inject primitive and string values. It works with reference only.A.Javapackage com.collaba.autowiring;//This class contains reference of B class and constructor and method.public class A { B b; A(){System.out.println("a is created");} public B getB() { return b; } public void setB(B b) { this.b = b; } void print(){System.out.println("hello a");} void display(){ print(); b.print(); } }

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Autowiring in SpringB.Java

package com.collaba.autowiring;//This class contains a constructor and method only.public class B { B(){System.out.println("b is created");} void print(){System.out.println("hello b");} }

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Autowiring in SpringTest.javapackage com.collaba.autowiring;import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; //This class gets the bean from the applicationContext.xml file and calls the display method.public class Test { public static void main(String[] args) { ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml"); A a=context.getBean("a",A.class); a.display(); } }

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Autowiring in SpringapplicationContext.xml<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="b" class="com.collaba.autowiring.B"></bean> <bean id="a" class="com.collaba.autowiring.A" autowire="byName"></bean> </beans>

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