Spring AOP's pointcut expression using execution() AspectJ Designator with Example

Open Eclipse
Click on menu New -> Others
In wizards type "Java Project" and Select "Java Project"
Click Next
Enter project name as "AOPLogBeforeAndAfterMethodonExcutionExpression", then click Next
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.
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.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());
    }
}

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="execution(void com.springexample.StudentHolder.displayStudentDetails())" 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;
    }   
}