spring-AOP实现方式（3----AspectJ的AOP实现）

AspectJ的AOP实现

配置文件中的配置
1、增加对注解名空间和schema的支持
xmlns:context="http://www.springframework.org/schema/context"

http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd

2、增加AOP的XML名空间和schema的支持
xmlns:aop="http://www.springframework.org/schema/aop"

http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd

3、增加自动扫描注解和使用AspectJ自动代理支持
<context:annotation-config/>
<context:component-scan base-package="com.hank"/>

<aop:aspectj-autoproxy/>

java代码方面
4、编写切面类
@Aspect   //声明为切面
@Component   //声明为组件
public class UserAspectJProxy {
@Before("execution(public void com.hank.dao.impl.UserDaoImpl.*User())")
public void before() {
System.out.println("------before execute method------");
}

@AfterReturning("execution(public void com.hank.dao.impl.UserDaoImpl.*User())")
public void after() {
System.out.println("------after execute method------");
}
}

具体实现如下


具体代码：
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:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	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/context
		http://www.springframework.org/schema/context/spring-context-3.0.xsd
		http://www.springframework.org/schema/aop
		http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

	<context:annotation-config/>
	<context:component-scan base-package="com.hank"/>

	<aop:aspectj-autoproxy/>

	<!-- 1.定义具体被代理类 -->
	<bean id="userDaoImpl" class="com.hank.dao.impl.UserDaoImpl"/>
</beans>

被代理的具体的类：

package com.hank.dao.impl;
import com.hank.dao.UserDao;

public class UserDaoImpl implements UserDao{
	public void saveUser() {
		System.out.println("保存用户信息。。。。。。");
	}

	public void queryUser() {
		System.out.println("查看用户信息。。。。。。");
	}
}

被代理类实现的接口类

package com.hank.dao;

public interface UserDao {
	//保存用户信息
	public void saveUser();
	//查看用户信息
	public void queryUser();
}

代理类，拦截处理类

package com.hank.proxy;

import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

@Aspect        //声明为注解
@Component     //声明为组件
public class UserDaoAspectJProxy {
	
	@Before("execution(public void com.hank.dao.impl.UserDaoImpl.*User())")
	public void before() {
		System.out.println("------before execute method-----------");
	}
	
	@AfterReturning("execution(public void com.hank.dao.impl.UserDaoImpl.*User())")
	public void after() {
		System.out.println("------after execute method-----------");
	}
}

测试类

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.hank.dao.UserDao;
import junit.framework.TestCase;

public class TestAopByAspectJProxy extends TestCase{
	public void test1() {
		ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
		UserDao userDao = (UserDao)ctx.getBean("userDaoImpl");
		userDao.saveUser();
	}
}

输出结果
log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
------before execute method-----------
保存用户信息。。。。。。
------after execute method-----------


注：代理类，拦截类，可以写成如下形式，更加简洁

package com.hank.proxy;

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        //声明为注解
@Component     //声明为组件
public class UserDaoAspectJProxy {
	
	@Pointcut("execution(public void com.hank.dao.impl.UserDaoImpl.*User())")
	public void doFilter() {
		
	}
	
	@Before("doFilter()")
	public void before() {
		System.out.println("------before execute method-----------");
	}
	
	@AfterReturning("doFilter()")
	public void after() {
		System.out.println("------after execute method-----------");
	}
}