Spring的注解学习(ioc,aop结合)

首先引入jar包

aspectjrt.jar

aspectjweaver.jar

1、dao

package com.dao;



public interface OkpDao {

	public void save();

	public void update();

}

2、impl

package com.dao.impl;



import org.springframework.context.annotation.Scope;

import org.springframework.stereotype.Component;



import com.dao.OkpDao;

@Component("okpDaoImpl")

public class OkpDaoImpl implements OkpDao{

	

	public void save() {

		System.out.println("OkpDaoImpl.save()");

	}

	public void update() {

		System.out.println("OkpDaoImpl.update()");		

	}

}

3、service

package com.service;



import javax.annotation.PostConstruct;

import javax.annotation.PreDestroy;

import javax.annotation.Resource;



import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.stereotype.Component;



import com.dao.OkpDao;

@Component

public class OkpService {

	private OkpDao okpDao;



	public OkpDao getOkpDao() {

		return okpDao;

	}

	@Resource(name="okpDaoImpl")

	public void setOkpDao(OkpDao okpDao) {

		this.okpDao = okpDao;

	}

	public void save(){

		this.okpDao.save();

	}

	public void update(){

		this.okpDao.update();

	}

	@PostConstruct

	public void init(){

		

		System.out.println("容器创建前执行");

	}

	

	@PreDestroy

	public void destory(){

		System.out.println("容器销毁后执行");

	}

}

　4、切面类

package com.service;



import org.aspectj.lang.annotation.After;

import org.aspectj.lang.annotation.AfterReturning;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Before;

import org.aspectj.lang.annotation.Pointcut;

import org.springframework.stereotype.Component;



@Aspect

@Component

public class SaveInter {

	

	@Pointcut("execution(* com.service.OkpService.*(..))")

	public void method(){};

	

	@Before("method()")

	public void before(){

		System.out.println("前置通知");

	}

	@AfterReturning("method()")  

	public void doAfter(){  

		System.out.println("后置通知");  

	}  

	@After("method()")

	public void after(){

		System.out.println("最终通知");

	}

}

@Aspect切面类

@Component 将该类加载到spring容器

@Poincut 定义一个切面

@Before 当执行切面中的方法前，会执行

@AfterReturning 方法执行完执行

@After 相当于方法中的try{}catch{}finally{}中的finally,执行完方法前会执行　

　5、测试类

package com.service;



import org.junit.Test;

import org.springframework.beans.factory.BeanFactory;

import org.springframework.context.support.ClassPathXmlApplicationContext;



public class OkpServiceTest {



	@Test

	public void testSave() {

		BeanFactory bf=new ClassPathXmlApplicationContext("applicationContext.xml");

		OkpService okp=(OkpService) bf.getBean("okpService");

		okp.save();

		okp.update();

	}



}

　　6、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:tx="http://www.springframework.org/schema/tx" 

        xmlns:aop="http://www.springframework.org/schema/aop"

        xmlns:context="http://www.springframework.org/schema/context" 

        xmlns:jee="http://www.springframework.org/schema/jee"

        xsi:schemaLocation="

            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd

            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd

            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd

            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd

            http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd">

        <context:annotation-config />

        <context:component-scan base-package="com"></context:component-scan>

        <aop:aspectj-autoproxy></aop:aspectj-autoproxy>

</beans>

 　　使用Aop注解，xml配置文件中要加入<aop:aspectj-autoproxy></aop:aspectj-autoproxy>

运行结果：

log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
容器创建前执行
前置通知
OkpDaoImpl.save()
最终通知
后置通知
前置通知
OkpDaoImpl.update()
最终通知
后置通知