<p>In this article, we will explore about event handling Spring application. Spring Framework also provide an another feature to promote loose coupling ,which is Application Event handling. Using Events, an Event publisher object can communicate with other objects without even knowing which object is listen.and event listener can work to event without knowing which object publish the events. Publisher Object that object ,who publish the event or call the event and Listener always listen the events that are occurs.</p>
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<div dir="ltr" style="text-align: justify;">
<div dir="ltr" style="text-align: justify;">
<div style="color: #274e13;">To make a custom event extends the class with ApplicationEvent class.The ApplicationEventPublisher has contain publishEvent() method that enable to publish ApplicationEvents (Custom Events).Any ApplicationListener that is registered with the onApplicationEvent() method in application,listen the events.</div>
<div style="color: #274e13;">To understand The Event handling Lets illustrate a simple example-</div>
<p><b>Circle.java</b></p>
<pre class="highlight">package com.dineshonjava.sdnext.eventHandling.tutorial; 
 
import javax.annotation.Resource; 
 
import org.springframework.context.ApplicationEventPublisher; 
import org.springframework.context.ApplicationEventPublisherAware; 
import org.springframework.context.MessageSource; 
import org.springframework.stereotype.Controller; 
 
/** 
 * @author Dinesh Rajput 
 * 
 */ 
@Controller 
public class Circle implements ApplicationEventPublisherAware 
{ 
 private Point center; 
 private ApplicationEventPublisher publisher; 
 
 /** 
 * @param center the center to set 
 */ 
 @Resource(name="pointB") 
 public void setCenter(Point center) 
 { 
 this.center = center; 
 } 
 
 public void draw() 
 { 
 System.out.println("Circle is Drawn"); 
 DrawEvent drawEvent = new DrawEvent(this); 
 publisher.publishEvent(drawEvent); 
 } 
 
 @Override 
 public void setApplicationEventPublisher(ApplicationEventPublisher publisher) 
 { 
 this.publisher = publisher; 
 } 
} 
</pre>
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<p><b>Point.java</b></p>
<pre class="highlight">package com.dineshonjava.sdnext.eventHandling.tutorial; 
 
/** 
 * @author Dinesh Rajput 
 * 
 */ 
public class Point 
{ 
 private int x; 
 private int y; 
 /** 
 * @return the x 
 */ 
 public int getX() 
 { 
 return x; 
 } 
 /** 
 * @param x the x to set 
 */ 
 public void setX(int x) 
 { 
 this.x = x; 
 } 
 /** 
 * @return the y 
 */ 
 public int getY() 
 { 
 return y; 
 } 
 /** 
 * @param y the y to set 
 */ 
 public void setY(int y) 
 { 
 this.y = y; 
 } 
} 
</pre>
<p><b>MyEventListener.java</b></p>
<pre class="highlight">package com.dineshonjava.sdnext.eventHandling.tutorial; 
 
import org.springframework.context.ApplicationEvent; 
import org.springframework.context.ApplicationListener; 
import org.springframework.stereotype.Component; 
 
@Component 
public class MyEventListener implements ApplicationListener 
{ 
 
 @Override 
 public void onApplicationEvent(ApplicationEvent event) 
 { 
 System.out.println(event.toString()); 
 } 
 
} 
</pre>
<p><b>DrawEvent.java</b></p>
<pre class="highlight">package com.dineshonjava.sdnext.eventHandling.tutorial; 
 
import org.springframework.context.ApplicationEvent; 
 
public class DrawEvent extends ApplicationEvent 
{ 
 
 /** 
 * Dinesh Rajput 
 */ 
 private static final long serialVersionUID = 6973014356268900607L; 
 
 public DrawEvent(Object source) 
 { 
 super(source); 
 } 
 
 public String toString() 
 { 
 return "Draw event occurred"; 
 } 
} 
</pre>
<p><b>spring.xml</b></p>
<pre class="highlight"><;beans xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">; 
<;context:annotation-config>;<;/context:annotation-config>; 
<;bean class="com.sdnext.dineshonjava.eventHandling.tutorial.Point" id="pointB">; 
 <;property name="x" value="10">;<;/property>; 
 <;property name="y" value="20">;<;/property>; 
<;/bean>; 
<;context:component-scan base-package="com.sdnext.dineshonjava.eventHandling.tutorial">;<;/context:component-scan>; 
<;/beans>; 
</pre>
<p><b>DrawingApp.java</b></p>
<pre class="highlight">package com.dieshonjava.sdnext.eventHandling.tutorial; 
 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
 
/** 
 * @author Dinesh Rajput 
 * 
 */ 
public class DrawingApp 
{ 
 
 /** 
 * @param args 
 */ 
 public static void main(String[] args) 
 { 
ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml"); 
Circle circle = (Circle)context.getBean("circle"); 
circle.draw(); 
 } 
} 
</pre>
<p> ;</p>
<div style="background-color: #ff99cc; border-width: thin; border: solid;">
<div style="color: blue;"><b>Output:</b></div>
<p><b>Circle is Drawn</b><br />
<b>Draw event occurred</b></p>
</div>
</div>
<p> ;</p>
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