Spring的注解方式实现AOP

Z时代
2024-01-10
分类：综合

本文内容纲要：Spring的注解方式实现AOP

Spring对AOP的实现提供了很好的支持。下面我们就使用Spring的注解来完成AOP做一个例子。

首先，为了使用Spring的AOP注解功能，必须导入如下几个包。aspectjrt.jar,aspectjweaver.jar,cglib-nodep.jar.

然后我们写一个接口

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package com.bird.service;

public interface PersonServer {

public void save(String name);

public void update(String name, Integer id);

public String getPersonName(Integer id);

}

和一个接口实现类

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package com.bird.service.impl;

import com.bird.service.PersonServer;

public class PersonServiceBean implements PersonServer{

@Override

public void save(String name) {

System.out.println("我是save方法");

// throw new RuntimeException();

}

@Override

public void update(String name, Integer id) {

System.out.println("我是update()方法");

}

@Override

public String getPersonName(Integer id) {

System.out.println("我是getPersonName()方法");

return "xxx";

}

}

下面使用Spring注解方式对这个Bean进行方法拦截

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package com.bird.service;

import org.aspectj.lang.ProceedingJoinPoint;

import org.aspectj.lang.annotation.After;

import org.aspectj.lang.annotation.AfterReturning;

import org.aspectj.lang.annotation.AfterThrowing;

import org.aspectj.lang.annotation.Around;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Before;

import org.aspectj.lang.annotation.Pointcut;

* 切面

* @author Bird

@Aspect

public class MyInterceptor {

@Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")

private void anyMethod(){}//定义一个切入点

@Before("anyMethod() && args(name)")

public void doAccessCheck(String name){

System.out.println(name);

System.out.println("前置通知");

}

@AfterReturning("anyMethod()")

public void doAfter(){

System.out.println("后置通知");

}

@After("anyMethod()")

public void after(){

System.out.println("最终通知");

}

@AfterThrowing("anyMethod()")

public void doAfterThrow(){

System.out.println("例外通知");

}

@Around("anyMethod()")

public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable{

System.out.println("进入环绕通知");

Object object = pjp.proceed();//执行该方法

System.out.println("退出方法");

return object;

}

}

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@Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")

这句话是方法切入点，execution为执行的意思，*代表任意返回值，然后是包名，.*意思是包下面的所有子包。(..)代

表各种方法.

然后下面的注解就比较简单了，就是在使用方法前和中，还有环绕拦截/

然后在Spring的配置文件中继续配置Bean,需要打开AOP命名空间

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<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-2.5.xsd

http://www.springframework.org/schema/aop

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

aop:aspectj-autoproxy/

然后建立一个Junit测试

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package junit.test;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bird.service.PersonServer;

public class SpringAOPTest {

@Test

public void inteceptorTest(){

ApplicationContext ctx = new ClassPathXmlApplicationContext("beanAop.xml");

PersonServer bean = (PersonServer)ctx.getBean("personServiceBean");

bean.save(null);

}

}

测试结果为

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2012-3-12 18:08:39 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6: display name [org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6]; startup date [Mon Mar 12 18:08:39 CST 2012]; root of context hierarchy
2012-3-12 18:08:40 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [beanAop.xml]
2012-3-12 18:08:40 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
信息: Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6]: org.springframework.beans.factory.support.DefaultListableBeanFactory@b0bad7
2012-3-12 18:08:40 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@b0bad7: defining beans [org.springframework.aop.config.internalAutoProxyCreator,personServiceBean,myInterceptor]; root of factory hierarchy
null
前置通知
进入环绕通知
我是save方法
后置通知
退出方法
最终通知