日期:2014-05-17  浏览次数:20814 次

Spring中基于@AspectJ的AOP配置
本文用于知识点的简单总结。

对于Spring中AOP的配置,第二种方式是基于@AspectJ风格的注解方式,相关配置项在代码中定义。以下主要通过代码说明基本配置流程。

(1)定义需要实现的业务接口:
package com.aop.service;

public interface MyService {
    
    public void sayHello(String word);
    
}

(2)编写实现接口的业务类:
package com.aop.service;

public class MyServiceImpl implements MyService {

    @Override
    public void sayHello(String word) {
	System.out.println("Say :" + word);
    }

}

(3)切点、切面、通知等相关配置:
package com.aop.aspect;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

//切面声明
@Aspect
public class MyAspectJ {

    //切点声明
    @Pointcut(value = "execution(* com.aop.service..*.*(..))&& args(param)", argNames = "param")
    public void MyPointCut(String param) {
    }
    //前置通知声明
    @Before(value = "MyPointCut(param)", argNames = "param")
    public void beforeAdvice(String param) {
	System.out.println("--before advice,param:" + param);
    }

}

(4)xml配置文件:
<?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:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="   
           http://www.springframework.org/schema/beans   
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd   
           http://www.springframework.org/schema/aop   
           http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
           
	<!-- 开启 @AspectJ 风格的切面声明 -->
	<aop:aspectj-autoproxy />

	<!-- 接口实现业务类 -->
	<bean id="MyService" class="com.aop.service.MyServiceImpl" />

	<!-- 切面定义类,包含切点、切面、通知等相关配置 -->
	<bean id="MyAspectJ" class="com.aop.aspect.MyAspectJ" />

</beans>  

(5)测试类:
package com.spring.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import com.aop.service.MyService;

public class TestAop {

    public static void main(String[] args) {
	
	ApplicationContext context = new FileSystemXmlApplicationContext("aspectJAop.xml");	
	MyService service = (MyService) context.getBean("MyService");
	
	service.sayHello("Spring aop");
    }
}

(6)输出结果:
--before advice,param:Spring aop
Say :Spring aop