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Spring AOP's pointcut expression using within() AspectJ Designator with Example
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Below is an example of "Spring AOP's pointcut expression using within() AspectJ Designator with Example"
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AOPLogBeforeAndAfterMethodUsingwithinExpression

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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 "AOPLogBeforeAndAfterMethodUsingwithinExpression", 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 
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");
		StudentHolder studentHolder = (StudentHolder) context.getBean("studentHolder");
			studentHolder.displayStudentDetails();
			studentHolder.showStudentName();
	}
}
StudentHolder.java
package com.springexample;

public class StudentHolder {
	Student student;

	public Student getStudent() {
		return student;
	}

	public void setStudent(Student student) {
		this.student = student;
	}	
	
	public void displayStudentDetails(){
		System.out.println("Student Details");
		System.out.println("---------------");
		System.out.println("Student No: "+student.getStudentNo());
		System.out.println("Student Name: "+student.getStudentName());
	}
	
	public void showStudentName(){
		System.out.println(student.getStudentName());
	}
}
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="studentHolder" class="com.springexample.StudentHolder">
		<property name="student" value="#{student}" />
	</bean>
	
	<bean id="mylogger" class="com.springexample.MyLogger" />
	
	<aop:config>
		<aop:aspect ref="mylogger">
			<aop:pointcut expression="within(com.springexample.StudentHolder)" id="studentDisplayLogsPnt"/>
			
			<aop:before pointcut-ref="studentDisplayLogsPnt" method="beforeDisplay" />
			<aop:after pointcut-ref="studentDisplayLogsPnt" method="afterDisplay" />
		</aop:aspect>
	</aop:config>

</beans>
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;
	}	
}
Output 
Before display!
Student Details
---------------
Student No: 1001
Student Name: John Peter
After display!

Before display!
John Peter
After display!
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