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Spring AOP's pointcut expression using @target() AspectJ Designator with Example
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Below is an example of "Spring AOP's pointcut expression using @target() AspectJ Designator with Example"
Output 
Before display!
Age: 29
City: New york
State: American State
After display!
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AOPLogBeforeAndAfterMethodUsingtargetAnnotaion

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Step.1 Start a Java Project with required jars 
  1. Open Eclipse
  2. Click on menu New -> Others
  3. In wizards type "Java Project" and Select "Java Project"
  4. Click Next
  5. Enter project name as "AOPLogBeforeAndAfterMethodUsingtargetAnnotaion", then click Next
  6. Goto Libraries tab, then click on Add External JARs, then select Spring's 21 Framework Jars aopalliance-1.0.jar, aspectjtools-1.6.6.jar and commons-logging-1.1.jar.
  7. Click Finish.
Step.2 Project Explorer Preview 
StudentAdditionalDetails.java
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);
	}
}
RunMyProgram.java
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();
		}
	}
}
beans.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: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>
StudentQualifier.java
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 {
}
MyLogger.java
package com.springexample;

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