Spring Framework - MethodReplacer Example in spring

Spring framework with AOP show many magic.One of them is Method Replacer .In this activity the called method is replaced by another method. To understand clearly have a good example-
Directory Structure-

Class Ract.java-

package com.test;

public class Ract {

String name;


public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getContent()
{
return "hello methd";
}

}

class Triangle.java-

package com.test;


public class Triangle {

private String type;
private int height;
private Ract ract;

public Ract getRact() {
return ract;
}

public void setRact(Ract ract) {
this.ract = ract;
}

public int getHeight() {
return height;
}

public void setHeight(int height) {
this.height = height;
}
public String getContent()
{
return "pre method";
}



public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public void draw()
{
System.out.println( getType()+"Triangle.\n The height is="+getHeight() );
System.out.println("ractangle is="+ract.getName());
System.out.println("getcontent method="+getContent());
}

}

Class MethodReplace.java-

package com.test;

import java.lang.reflect.Method;

import org.springframework.beans.factory.support.MethodReplacer;

public class MethodReplace implements MethodReplacer {

@Override
public Object reimplement(Object arg0, Method arg1, Object[] arg2)
throws Throwable {
// TODO Auto-generated method stub
return "huree!!!!I m Replaced";
}

}

class DrawApp.java-

package com.test;

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

public class DrawApp {

public static void main(String a[])
{
AbstractApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");
context.registerShutdownHook();//callsdestroy method dow the rsorce
Triangle tri= (Triangle) context.getBean("triangle");
tri.draw();
}
}

spring.xml -

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">

<beans>
<bean id="ract" class="com.test.Ract">
<property name="name" value="navin's"></property>
</bean>
<bean id="mrp" class="com.test.MethodReplace"></bean>

 <bean id="triangle" class="com.test.Triangle">
 <property name="type" value="test"></property>
 <property name="height" value="2"></property>
 <property name="ract" ref="ract"></property>
  <replaced-method name="getContent" replacer="mrp" />
</bean>
 
</beans>

Output-

testTriangle.
The height is=2
ractangle is=navin's
getcontent method=huree!!!!I m Replaced

For Further Reading,

General, Java, spring