基于基于XML配置方式声明切面

beans.xml文件的配置

<?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="personService" class="cn.itcast.service.impl.PersonServiceBean"></bean>
        <bean id="aspetbean" class="cn.itcast.service.MyInterceptor"/>
        <aop:config>
            <aop:aspect id="asp" ref="aspetbean">
                <aop:pointcut id="mycut" expression="execution(* cn.itcast.service..*.*(..))"/>
                <aop:before pointcut-ref="mycut" method="doAccessCheck"/>
                <aop:after-returning pointcut-ref="mycut" method="doAfterReturning"/>
                 <aop:after-throwing pointcut-ref="mycut" method="doAfterThrowing"/>
                 <aop:after pointcut-ref="mycut" method="doAfter"/>
                 <aop:around pointcut-ref="mycut" method="doBasicProfiling"/>
            </aop:aspect>
        </aop:config>
</beans>

<aop:pointcut id="mycut" expression="execution(* cn.itcast.service..*.*(..))"/>

声明一个切入点，表达式表示拦截所有的返回类型，service文件下的所有子文件的类，的所有方法

切面就是一个pojo类

package cn.itcast.service;

import org.aspectj.lang.ProceedingJoinPoint;
/**
 * 切面
 *doBasicProfiling(ProceedingJoinPoint pjp)这个方法可以不要
 *就不用引入相关的包
 */
public class MyInterceptor {
    public void doAccessCheck() {
        System.out.println("前置通知");
    }

    public void doAfterReturning() {
        System.out.println("后置通知");
    }

    public void doAfter() {
        System.out.println("最终通知");
    }

    public void doAfterThrowing() {
        System.out.println("例外通知");
    }

    public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("进入方法");
        Object result = pjp.proceed();
        System.out.println("退出方法");
        return result;
    }

}

被切入的类

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");
    }

}

测试一下

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.getPersonName(2);
        personService.update("king", 2);
    }
}
log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).log4j:WARN Please initialize the log4j system properly.前置通知进入方法我是getPersonName()方法后置通知最终通知退出方法前置通知进入方法我是update()方法后置通知最终通知退出方法