AOP切面編程一

第一步：定義業務層接口與實現

1.定義接口

package group.esperanto.service;

public interface IMessageService {
    public boolean doRemove(String mid);
}

2.定義實現類

package group.esperanto.service.impl;

import org.apache.log4j.Logger;
import group.esperanto.service.IMessageService;

public class MessageServiceImpl implements IMessageService {

	@Override
	public boolean doRemove(String mid) {
		Logger.getLogger(IMessageService.class).info("[業務層]---執行刪除ID = "+mid);
		return false;
	}

}

第二步：定義AOP程序處理類

package group.esperanto.proxy;

import org.apache.log4j.Logger;

public class ServiceProxy {
     public void BeforeInvoke(){
    	 Logger.getLogger(ServiceProxy.class).info("[ServiceProxy - Before]"); 
     }
     public void AfterInvoke(){
    	 Logger.getLogger(ServiceProxy.class).info("[ServiceProxy - Before]"); 
     }
}

第三步：在applicationContext中進行配置

<?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"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:task="http://www.springframework.org/schema/task"  
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
		http://www.springframework.org/schema/task  http://www.springframework.org/schema/task/spring-task-4.1.xsd ">
     <bean id="serviceProxy" class="group.esperanto.proxy.ServiceProxy" />
     <bean id="messageServiceImpl" class="group.esperanto.service.impl.MessageServiceImpl"/>
     <!-- 針對AOP的處理進行配置 -->
     <aop:config>
        <!-- 定義業務操做切入點 -->
       <aop:pointcut expression="execution(* group.esperanto.service..*.*(..))" id="messagePoint"/>
        <!-- 定義具體操做到切入點的方法上 -->
       <aop:aspect ref="serviceProxy">
             <!-- 引用外部定義好的切入點 -->
           <aop:before method="beforeInvoke" pointcut-ref="messagePoint"/>
              <!-- 內部定義切入點 -->
           <aop:after method="afterInvoke" pointcut="execution(* group.esperanto.service..*.*(..))"/>
       </aop:aspect>
     </aop:config>
</beans>

第四步：測試調用

package group.esperanto.test;

import org.apache.log4j.Logger;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import group.esperanto.service.IMessageService;

public class Task {
	public static void main(String[] args) {
	  ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
      IMessageService messageService = ctx.getBean("messageServiceImpl",IMessageService.class);
      Logger.getLogger(Task.class).info(messageService.doRemove("110"));
	}
}