公司要求分享技術，一個小組九個人，每周一個人，想想講講AOP吧，用處也挺大的，果斷寫了一個小例子，改了改也就成了。這是個簡單AOP例子，包括前置通知，后置通知，環繞通知，和目標對象。

目標對象的接口:IStudent.java

package ?com.dragon.study;

/**?

?* ?@author ?ysm

?*/?

public ? interface ?IStudent ?{

????public ? void ?addStudent(String name);

}?

目標類:StudentImpl.java

package ?com.dragon.study.Impl;

import ?com.dragon.study.IStudent;

/**?

?* ?@author ?ysm

?*/?

public ? class ?StudentImpl ?implements ?IStudent {

????public ? void ?addStudent(String name) {

????????System.out.println( " 歡迎 ?" + name + " ?加入Spring家庭! " );

????}?

} ?

前置通知:BeforeAdvice.java

package ?com.dragon.Advice;

import ?java.lang.reflect.Method;

import ?org.springframework.aop.MethodBeforeAdvice;

/**?

?* ?@author ?ysm

?*/?

public ? class ?BeforeAdvice ?implements ?MethodBeforeAdvice {

????public ? void ?before(Method method,Object[] args, Object target)?throws ?Throwable {

????????System.out.println( " 這是BeforeAdvice類的before方法. " );

????}?

}

后置通知:AfterAdvice.java

package com.dragon.Advice;

import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;

/**

?* @author ysm

?*/

public class AfterAdvice implements AfterReturningAdvice{

????public void afterReturning(Object returnValue ,Method method,Object[] args,Object target) throws Throwable{

????????System.out.println("這是AfterAdvice類的afterReturning方法.");

????}

}

環繞通知:CompareInterceptor.java

package com.dragon.Advice;

import org.aopalliance.intercept.MethodInterceptor;

import org.aopalliance.intercept.MethodInvocation;

/**

?* @author ysm

?*/

public class CompareInterceptor implements MethodInterceptor{

????public Object invoke(MethodInvocation invocation) throws Throwable{

????????Object result = null;

????????String stu_name = invocation.getArguments()[0].toString();

????????if ( stu_name.equals("ysm")){

????????????//如果學生是ysm時,執行目標方法,

????????????result= invocation.proceed();

????????} else{

????????????System.out.println("此學生是"+stu_name+"而不是ysm,不批準其加入.");

????????}

????????return result;

????}

}

配置文件applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

<bean id="beforeAdvice" class="com.dragon.Advice.BeforeAdvice"></bean>

<bean id="afterAdvice" class="com.dragon.Advice.AfterAdvice"></bean>

<bean id="compareInterceptor" class="com.dragon.Advice.CompareInterceptor"></bean>

<bean id="studenttarget" class="com.dragon.study.Impl.StudentImpl"></bean>

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

<property name="proxyInterfaces">

<value>com.dragon.study.IStudent</value>

</property>

<property name="interceptorNames">

<list>

<value>beforeAdvice</value>

<value>afterAdvice</value>

<value>compareInterceptor</value> ?

</list>

</property>

<property name="target">

<ref bean="studenttarget"/>

</property>

</bean>

</beans>

現在開始寫測試類,Test.java

package com;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.FileSystemXmlApplicationContext;

import com.dragon.study.IStudent;

/**

?* @author ysm

?*/

public class Test {

????/**

?????* @param args

?????*/

????public static void main(String[] args) {

????????// TODO Auto-generated method stub

????????ApplicationContext ctx =?new FileSystemXmlApplicationContext("/com/dragon/applicationContext.xml");

????????IStudent person = (IStudent)ctx.getBean("student");

????????person.addStudent("ysm");

????????//person.addStudent("javadragon");

????}

}

轉載于:https://blog.51cto.com/yangsm/1427657

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