package com.springexample;

@StudentQualifier
public class StudentAdditionalDetails extends Student {
	private String age;
	private String city;
	private String state;
	
	public String getAge() {
		return age;
	}
	public void setAge(String age) {
		this.age = age;
	}
	public String getCity() {
		return city;
	}
	public void setCity(String city) {
		this.city = city;
	}
	public String getState() {
		return state;
	}
	public void setState(String state) {
		this.state = state;
	}	
	
	public void display(){
		System.out.println("Age: "+age);
		System.out.println("City: "+city);
		System.out.println("State: "+state);
	}
}

package com.springexample;

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

public class RunMyProgram {
	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
		{
			StudentAdditionalDetails student = (StudentAdditionalDetails) context.getBean("studentAdditionalDetails");
			student.display();
		}
	}
}

<?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:aop="http://www.springframework.org/schema/aop"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

	<bean id="student" class="com.springexample.Student">
		<property name="studentNo" value="1001" />
		<property name="studentName" value="John Peter" />
	</bean>
	
	<bean id="studentAdditionalDetails" class="com.springexample.StudentAdditionalDetails">
		<property name="age" value="29" />
		<property name="city" value="New york" />
		<property name="state" value="American State" />
	</bean>
	
	<bean id="mylogger" class="com.springexample.MyLogger" />
	
	<aop:config>
		<aop:aspect ref="mylogger">
			<aop:pointcut expression="@target(com.springexample.StudentQualifier)" id="studentDisplayLogsPnt"/>
			
			<aop:before pointcut-ref="studentDisplayLogsPnt" method="beforeDisplay" />
			<aop:after pointcut-ref="studentDisplayLogsPnt" method="afterDisplay" />
		</aop:aspect>
	</aop:config>

</beans>

package com.springexample;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target({ElementType.TYPE,ElementType.PARAMETER,ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface StudentQualifier {
}

package com.springexample;

public class MyLogger {
	public void beforeDisplay(){
		System.out.println("Before display!");
	}
	public void afterDisplay(){
		System.out.println("After display!");
	}
}

package com.springexample;

public class Student {
	private int studentNo;
	private String studentName;
	
	public int getStudentNo() {
		return studentNo;
	}
	public void setStudentNo(int studentNo) {
		this.studentNo = studentNo;
	}
	public String getStudentName() {
		return studentName;
	}
	public void setStudentName(String studentName) {
		this.studentName = studentName;
	}	
	
	public void display(){
		System.out.println("No: "+studentNo);
		System.out.println("Name: "+studentName);
	}
}