Spring AOP Before Advice Example | Spring Tutorial

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Spring AOP Before Advice Example | Spring Tutorial

Spring AOP Before Advice Example | Spring Tutorial

Spring AOP Before Advice 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>
    </dependencies>
</project>

EmployeeService.java

package com.ram.service;

public class EmployeeService
{
    public void displayEmployeeInfo()
    {
        System.out.println("Display Employee Information");
    }
}

LoggingAdvice.java

package com.ram.Advice;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class LoggingAdvice implements MethodBeforeAdvice
{

    public void before(Method method, Object[] args, Object target)
            throws Throwable
    {
        System.out.println("Logging advice is applied before the method "
                + method.getName() + " in the target Object "
                + target.getClass().getName());
    }

}

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <bean id="employeeService" class="com.ram.service.EmployeeService"></bean>
    <bean id="loggingAdvice" class="com.ram.Advice.LoggingAdvice"></bean>

    <bean id="employeeServiceProxy" class="org.springframework.aop.framework.ProxyFactoryBean">

        <property name="target" ref="employeeService"></property>
        <property name="interceptorNames">
            <list>
                <value>loggingAdvice</value>
            </list>
        </property>
    </bean>

</beans>

App.java

package com.ram.core;

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

import com.ram.service.EmployeeService;

public class App
{
    public static void main(String[] args)
    {
        ApplicationContext context = new ClassPathXmlApplicationContext(
                "applicationContext.xml");

        System.out.println("---------------------------------------");

        EmployeeService employeeService = context.getBean("employeeServiceProxy",
                EmployeeService.class);
   
        employeeService.displayEmployeeInfo();
    }

}

Output

Oct 11, 2018 8:25:37 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@6ebc05a6: startup date [Thu Oct 11 08:25:37 IST 2018]; root of context hierarchy
Oct 11, 2018 8:25:38 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
---------------------------------------
Logging advice is applied before the method displayEmployeeInfo in the target Object com.ram.service.EmployeeService
Display Employee Information

Click the below link to download the code:
https://sites.google.com/site/ramj2eev2/java_basics/SpringDemo_before_Advise.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/javaee/tree/master/Spring_2018/SpringDemo_before_Advise

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/e16b8c6ef73a72464fa5812e24080179c4adc913/Spring_2018/SpringDemo_before_Advise/?at=master

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