Spring AOP Example


It’s a simple implementation of Spring AOP.
Project Contents: 
 
File Name
Use
service.xml
Configuration File.
ServiceClass
Target Class on which we will apply AOP.
AdviceClass
Advisor class which will be applied on target class.
SeviceUtilizer
It will control the overall process.

service.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"
                   xsi:schemaLocation="http://www.springframework.org/schema/beans
                                                http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

                <bean id="serviceClass" class="aop.ServiceClass">
                                <property name="name" value="Hemant Kumar" />
                                <property name="url" value="http://www.hemant.com" />
                </bean>

                <bean id="advice" class="aop.AdviceClass" />

                <bean id="myProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
                                <property name="target" ref="serviceClass" />
                                <property name="interceptorNames">
                                                <list>
                                                                <value>advice</value>
                                                </list>
                                </property>
                </bean>
</beans>


ServiceClass
 
package aop;

public class ServiceClass
{
                private String name;
                private String url;
                public void setName(String name)
                {
                                this.name = name;
                }
                 public void setUrl(String url)
                {
                                this.url = url;
                }
                 public void printName()
                {
                                System.out.println("Customer name : " + this.name);
                }
                 public void printURL()
                {
                                System.out.println("Customer website : " + this.url);
                }
                 public void printThrowException()
                {
                                throw new IllegalArgumentException();
                }
}


AdviceClass

package aop;

import java.lang.reflect.Method;
import org.springframework.aop.MethodBeforeAdvice;
import org.springframework.aop.AfterReturningAdvice;
import org.springframework.aop.ThrowsAdvice;

public class AdviceClass implements MethodBeforeAdvice, AfterReturningAdvice, ThrowsAdvice
{
                @Override
                public void before(Method method, Object[] args, Object clazz) throws Throwable
                {
                                System.out.println("Going into Class Name: " + clazz.getClass().getSimpleName() + "   Method Name: " + method.getName());
                }

                @Override
                public void afterReturning(Object obj, Method method, Object[] arg2,Object clazz) throws Throwable
                {
                                System.out.println("Returning from Class Name: "+ clazz.getClass().getSimpleName() + "   Method Name: " + method.getName());
                }
               
                public void afterThrowing(Method method,Object arg[],Object clazz,Exception exception) throws Throwable
                {
                                System.out.println(exception.getClass().getSimpleName() + " thrown from Class Name: " + clazz.getClass().getSimpleName() + "   Method Name: " + method.getName());
                }
}


SeviceUtilizer

package aop;

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

public class SeviceUtilizer
{
                public static void main(String[] args)
                {
                                ApplicationContext appContext =            new ClassPathXmlApplicationContext(new String[] { "service.xml" });
                                ServiceClass obj = (ServiceClass) appContext.getBean("myProxy");
                                obj.printName();
                                obj.printURL();
                                try
                                {
                                                obj.printThrowException();
                                }
                                catch (Exception e) { }
                }
}

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