面向切面编程的例子

随意的测试结构

//Aspect1.java
package entity;

public class Aspect1 {
		public void before(){
			System.out.println("业务执行前，before方法被执行");
		}
		
		public void after(){
			System.out.println("业务执行后，after方法被执行");
		}
}

//Service1.java

package service;

public class Service1 {

	public  void doSomething1(){
		System.out.println("业务服务1");
	}
	
	public  void doSomething2(){
		System.out.println("业务服务2");
	}

	public Service1() {

	}
	
	
}

//TestDemo .java

package test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import service.Service1;

public class TestDemo {
	
	@Test
	public void test(){
		ApplicationContext ac= new ClassPathXmlApplicationContext("applicationContext.xml");
		Service1 s=ac.getBean("s1",Service1.class);
		s.doSomething1();
		System.out.println();
		s.doSomething2();
	}

}

一：基于xml配置##

①applicationContext.xml中的配置

<?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:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util"  
	xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:aop="http://www.springframework.org/schema/aop" 
	xmlns:jpa="http://www.springframework.org/schema/data/jpa" xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
		http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
		http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

<bean id="s1" class="service.Service1"></bean>
<bean id="as1" class="entity.Aspect1"></bean>
<aop:config>
	<aop:aspect  ref="as1"><!--  设置切面类 ref表示切面的id -->
	    <aop:pointcut expression="execution(* service.*.*(..))" id="dd"/>    <!--  设置执行某个执行点时运行切面    service.*.*(..)表示service包中的所有类的所有方法执行的时候都出发这个切面执行 -->
	    <aop:after method="after"  pointcut-ref="dd"/> <!--  执行点之后运行切面类中的after方法 -->
	    <aop:before method="before"  pointcut-ref="dd"/>	 <!--  执行点之前运行切面类中的before方法 -->
	</aop:aspect>
</aop:config>

</beans>

②Junit运行TestDemo中的test方法得到结果

二：基于注解的配置##

①applicationContext.xml中的配置

<?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:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util"  
	xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:aop="http://www.springframework.org/schema/aop" 
	xmlns:jpa="http://www.springframework.org/schema/data/jpa" xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
		http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
		http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
		
<bean id="s1" class="service.Service1"></bean>
<bean id="as1" class="entity.Aspect1"></bean>
<aop:aspectj-autoproxy  proxy-target-class="true"></aop:aspectj-autoproxy>
</beans>

②：Aspect.java的代码，其他两个类不变

package entity;

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

@Aspect
public class Aspect1 {
		
		@Before("execution(* service.*.*(..))")
		public void before(){
			System.out.println("业务执行前，before方法被执行");
		}
		@After("execution(* service.*.*(..))")
		public void after(){
			System.out.println("业务执行后，after方法被执行");
		}
}

③：Junit运行TestDemo中的test方法得到结果