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Sunday, 2 March 2014

Spring ClassPathXmlApplicationContext

In this tutorial we are going to see ClassPathXmlApplicationContext with example program.
ClassPathXmlApplicationContext
The ClassPathXmlApplicationContext container load the bean definition from XML file. If you use ClassPathXmlApplicationContext you need to create Bean definition xml file in your class path.This container will look bean configuration XML file in CLASSPATH  
Step by step procedure to create Spring Program using Eclipse given below.
Follow the Simple steps.
1. Select File –> New –> Java Project from your Eclipse IDE.
2.Create project called ClassPathXmlApplicationContext.
3. Add the following jars into your build path.
commons-logging-1.1.3.jar
spring-beans-3.2.6.RELEASE.jar
spring-context-3.2.6.RELEASE.jar
spring-context-support-3.2.6.RELEASE.jar
spring-core-3.2.6.RELEASE.jar
spring-expression-3.2.6.RELEASE.jar
4. Now create package com.javatutorialscorner.spring under ClassPathXmlApplicationContext Project
5. Next create SpringClassPathXmlApplicationContext class under com.javatutorialscorner.spring package
SpringClassPathXmlApplicationContext.java
package com.javatutorialscorner.spring;

public class SpringClassPathXmlApplicationContext {
private String sayHello;

public void getSayHello() {
System.out.println("Java Tutorials Corner " + sayHello);
}

public void setSayHello(String sayHello) {
this.sayHello = sayHello;
}
}

6. Now Create RunApp class which contains Bean configuration path to load configuration from Bean.xml file

RunApp.java

package com.javatutorialscorner.spring;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class RunApp {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
SpringClassPathXmlApplicationContext applicationContext = (SpringClassPathXmlApplicationContext)context.getBean("classpathxml");
applicationContext.getSayHello();
}

}

In above program

First step I created Application context using ClassPathXmlApplicationContext  which load configuration from bean file  which located in class path of application, It take care of creating and initializing all the objects (Beans) declared in bean.xml

Next getBean() method used to get particular bean from created context. This method used bean name as parameter and returns generic object. We can caste to actual object.

Once Object Created you can access any method from that class.

7. Create Bean.xml at where your class files created (ClassPathXmlApplicationContext tries to load bean file from class path).

Bean.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

<bean id="classpathxml" class="com.javatutorialscorner.spring.SpringClassPathXmlApplicationContext">
<property name="sayHello" value="say Hello"></property>
</bean>
</beans>

Bean.xml is default name given to bean configuration file. You can choose any name for your bean.xml but you can use file name in main application to create context and your file available in your class path must be same.

Bean.xml is used to assign unique ID to different beans and controls the creation  object with different values, using above file you can pass any value to   variable sayHello without changing the class file.

Now you can run the program see the following output in console.

Java Tutorials Corner say Hello
Annamalai Thangaraj

Annamalai is working as Technical Lead in Leading Telecom company with 5+ years experience in Identity and Access Management , Telecom and Networks, BigData, Java, Spring, Struts, Hibernate, AngularJS, and Enterprise Web Application Development.

Website: Java Tutorials Corner

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Item Reviewed: Spring ClassPathXmlApplicationContext Rating: 5 Reviewed By: Annamalai Thangaraj