Spring AOP AspectJ @Before Annotation Example | Spring Tutorial

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Understanding the @Before Annotation

In this tutorial, we explore one of the cornerstones of Spring Aspect-Oriented Programming (AOP): the @Before advice. This tool is essential for any developer looking to write cleaner, more modular code.

What is @Before Advice?

The @Before advice tells Spring to execute specific logic—like logging or security checks—before the execution of a target method. It’s a powerful way to handle "cross-cutting concerns" without cluttering your business logic.

Key Implementation Steps

• Create an Aspect: Use the @Aspect annotation on your class.
• Define the Advice: Annotate your method with @Before.
• Set the Pointcut: Specify which methods Spring should intercept.
• Configure the Proxy: Enable AspectJ support in your Spring configuration.

Why It Matters for Beginners

Instead of copying and pasting the same logging code into ten different methods, you write it once in your Aspect class. This makes your application much easier to maintain and update as it grows!

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Spring AOP AspectJ @Before Annotation Example | Spring Tutorial

Spring AOP AspectJ @Before Annotation Example | Spring Tutorial

Spring AOP AspectJ @Before Annotation Example | Spring Tutorial

Spring AOP AspectJ @Before Annotation Example | Spring Tutorial

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.ram.core</groupId>
    <artifactId>SpringDemo</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>SpringDemo</name>
    <url>http://maven.apache.org</url>

    <properties>
        <spring.version>5.0.5.RELEASE</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <!-- Spring 5 dependencies -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- Spring AOP + AspectJ -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
       
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.9.1</version>
        </dependency>
       
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.1</version>
        </dependency>

    </dependencies>

</project>

EmployeeService.java

package com.ram.service;

public class EmployeeService
{
    public void addEmployee()
    {
        System.out.println("Add Employee ");
    }
   
    public void modifyEmployee()
    {
        System.out.println("Modify Employee");
    }
   
    public void deleteEmployee()
    {
        System.out.println("Delete Employee");
    }

}