Spring Framework

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Spring Project 1

Example of Before Advice
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Introduction: This Spring Before advice provide the service before invoking the method. It means that Before advices represent those concern which are to be applied before a method is invoked. Which are applied in Validation, Authorization, etc. are the task which can be implemented using before advice.

Technology use to run this source code

  1. Spring 2.5 jar files
  2. Eclipse IDE
  3. Tomcat Server

Source Code:

applicationContext.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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean id="t" class="org.r4r.One"/>
<bean id="a1" class="org.r4r.BeforeAdvisor"/>
<bean id="proxy" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="t"/>
<property name="interceptorNames">
<list><value>a1</value></list>
</property>
</bean>
</beans>

 

Showable.java

package org.r4r;
public interface Showable {
public abstract void show();
}

BeforeAdvisor.java

package org.r4r;
import java.lang.reflect.Method;
import org.springframework.aop.MethodBeforeAdvice;
public class BeforeAdvisor implements MethodBeforeAdvice {
@Override
public void before(Method arg0, Object[] arg1, Object arg2)
throws Throwable {
System.out.println("Before advice is applied..");
}
}

One.java

package org.r4r;
public class One implements Showable {
@Override
public void show() {
System.out.println("Show() method of One invoked..");
}
}

ProxyTest.java

package org.r4r;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
public class ProxyTest {
public static void main(String[] args) {
Resource r=new ClassPathResource("applicationContext.xml");
BeanFactory f=new XmlBeanFactory(r);
System.out.println("Obtaining proxy of one..");
Showable p=(Showable)f.getBean("proxy");
System.out.println("Proxy obtaining invoked.");
p.show();
}
}

output:


 Obtaining proxy of one..
Proxy obtaining invoked.
Before advice is applied..
Show() method of One invoked..

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