基于注解方式声明切面

首先启动对@AspectJ注解的支持(蓝色部分)：
       xmlns:xsi=""
       xmlns:aop=""
       xsi:schemaLocation="
          
           ">
 
 
 

配置beans.xml文件

 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns=""
       xmlns:xsi=""
       xmlns:context=""
       xmlns:aop=""
       xsi:schemaLocation="
           /spring-beans-2.5.xsd
            /spring-context-2.5.xsd
            /spring-aop-2.5.xsd">
        <aop:aspectj-autoproxy/>
        <bean id="myInterceptor" class="cn.itcast.service.MyInterceptor"/>
        <bean id="personService" class="cn.itcast.service.impl.PersonServiceBean"></bean>
</beans>

定义一个切面

 

package cn.itcast.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
 */
@Aspect
public class MyInterceptor {
    @Pointcut("execution (* cn.itcast.service.impl..*(..))")
    private void anyMethod() {}//声明一个切入点,看上去有点怪，声明式的，


    @Before("anyMethod() && args(name)")
    public void doAccessCheck(String name) {
        System.out.println("前置通知:"+ name);
    }
    @AfterReturning(pointcut="anyMethod()",returning="result")
    public void doAfterReturning(String result) {
        System.out.println("后置通知:"+ result);
    }
    @After("anyMethod()")
    public void doAfter() {
        System.out.println("最终通知");
    }
    @AfterThrowing(pointcut="anyMethod()",throwing="e")
    public void doAfterThrowing(Exception e) {
        System.out.println("例外通知:"+ e);
    }

    @Around("anyMethod()")
    public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable {
        //if(){//判断用户是否在权限

        System.out.println("进入方法");
        Object result = pjp.proceed();
        System.out.println("退出方法");
        //}

        return result;
    }

}

被拦截的类

 

package cn.itcast.service.impl;

import cn.itcast.service.PersonService;

public class PersonServiceBean implements PersonService {

    public String getPersonName(Integer id) {
        System.out.println("我是getPersonName()方法");
        return "xxx";
    }

    public void save(String name) {
        //throw new RuntimeException("我爱例外");

        System.out.println("我是save()方法");
    }

    public void update(String name, Integer id) {
        System.out.println("我是update()方法");
    }

}

测试类

 

package junit.test;


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

import cn.itcast.service.PersonService;

public class SpringAOPTest {

    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
    }

    @Test public void interceptorTest(){
        ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml");
        PersonService personService = (PersonService)cxt.getBean("personService");
        personService.save("xx");
    }
}

log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
前置通知:xx
进入方法
我是save()方法
后置通知:null
最终通知
退出方法