使用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

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

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

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;  
    }  
}  

@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

<?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-2.5.xsd  
       http://www.springframework.org/schema/aop   
       http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">  
          
        <aop:aspectj-autoproxy/>  
    <bean id="personServiceBean" class="com.bird.service.impl.PersonServiceBean"/>  
    <bean id="myInterceptor" class="com.bird.service.MyInterceptor"/>  
     
</beans>  

然后建立一个Junit测试

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

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  

本文转自：http://blog.csdn.net/a352193394/article/details/7345860