Spring AOP — Befor, After, Around Advice | Code Factory

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  • MethodBeforeAdvice, AfterReturningAdvice, MethodInterceptor example using XML

Create Java Project

  • Open Eclipse
  • Go to File -> New -> Other… -> Java Project
  • Create AOP-Programmatic5 project
  • Right click on project -> Build Path -> Configure Build Path -> Libraries tab -> Add External JARs
    - aopalliance.jar
    - aspectjrt.jar
    - aspectjweaver.jar
    - cglib-nodep-X.X.jar
    - commons-logging-X.X.jar
    - spring-aop-X.X.X.jar
    - spring-beans-X.X.X.jar
    - spring-context-X.X.X.jar
    - spring-core-X.X.X.jar
    - aspectjlib-X.X.X.jar
    - spring-aspects-X.X.X.jar
  • * You can find dtd information from spring-beans-X.X.X.jar -> org -> springframework -> beans -> factory -> xml -> spring-beans.dtd (line no 36 & 37)

spring.xml

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
<!-- target -->
<bean id="b" class="com.codeFactory.business.Bank" />
<!-- service -->
<bean id="lbs" class="com.codeFactory.service.LogBeforeService" />
<bean id="las" class="com.codeFactory.service.LogAfterService" />
<bean id="lars" class="com.codeFactory.service.LogAroundService" />
<!-- proxy -->
<bean id="pfb" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="b" />
<property name="interceptorNames">
<list>
<value>lbs</value>
<value>las</value>
<value>lars</value>
</list>
</property>
</bean>
</beans>

LogBeforeService.java

package com.codeFactory.service;import java.lang.reflect.Method;import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.aop.MethodBeforeAdvice;
import com.codeFactory.business.Bank;/**
* @author code.factory
*
*/
public class LogBeforeService implements MethodBeforeAdvice {
@Override
public void before(Method method, Object[] objects, Object object) throws Throwable {
Log l = LogFactory.getLog(Bank.class);
l.info("Deposit method");
}
}

LogAfterService.java

package com.codeFactory.service;import java.lang.reflect.Method;import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.aop.AfterReturningAdvice;
import com.codeFactory.business.Bank;/**
* @author code.factory
*
*/
public class LogAfterService implements AfterReturningAdvice {
@Override
public void afterReturning(Object obj1, Method method, Object[] objects, Object obj2) throws Throwable {
/*
* obj1 is return value
* obj2 is object
*/
Log l = LogFactory.getLog(Bank.class);
l.info("Deposit method " + obj1);
l.info("Deposit method " + obj2);
}
}

LogAroundService.java

package com.codeFactory.service;import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.codeFactory.business.Bank;/**
* @author code.factory
*
*/
public class LogAroundService implements MethodInterceptor {
@Override
public Object invoke(MethodInvocation mi) throws Throwable {
Log l = LogFactory.getLog(Bank.class);
l.info("before deposite code");
Object obj = mi.proceed();
l.info("after deposite code");
return obj;
}
}

Bank.java

package com.codeFactory.business;/**
* @author code.factory
*
*/
public class Bank {
private int amount = 1000;
private String accNo = "SBI12345";

public int deposit(int amount, String accNo) {
System.out.println("Bank.deposit()");
if(accNo.equals(this.accNo)) {
this.amount += amount;
} else {
throw new AccnoNotFoundException();
}
return this.amount;
}
}

AccnoNotFoundException.java

package com.codeFactory.business;/**
* @author code.factory
*
*/
public class AccnoNotFoundException extends RuntimeException {
@Override
public String toString() {
return "AccNo invalid";
}
}

Client.java

package com.codeFactory.test;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.codeFactory.business.Bank;/**
* @author code.factory
*
*/
public class Client {
public static void main(String... args) {
ApplicationContext context = new ClassPathXmlApplicationContext("com/codeFactory/resources/spring.xml");
Bank bankProxy = (Bank) context.getBean("pfb");
int amt = bankProxy.deposit(150, "SBI12345");
System.out.println(amt);
}
}

Output:

Dec 23, 2020 1:42:37 PM com.codeFactory.service.LogBeforeService before
INFO: Deposit method
Dec 23, 2020 1:42:37 PM com.codeFactory.service.LogAroundService invoke
INFO: before deposite code
Bank.deposit()
Dec 23, 2020 1:42:37 PM com.codeFactory.service.LogAroundService invoke
INFO: after deposite code
Dec 23, 2020 1:42:37 PM com.codeFactory.service.LogAfterService afterReturning
INFO: Deposit method 1150
Dec 23, 2020 1:42:37 PM com.codeFactory.service.LogAfterService afterReturning
INFO: Deposit method com.codeFactory.business.Bank@4667ae56
1150