0809 aop

package com.oracle.service;

public interface UserService {
    public abstract void get();
    public abstract void update();
    public abstract void insert();
    public abstract void delete();
}

package com.oracle.service;
//定义一个接口并实现
public class UserServiceImp implements UserService{
    @Override
    public void get() {
        System.out.println("查询用户");        
    }

    @Override
    public void update() {
        System.out.println("修改用户 ");
    }

    @Override
    public void insert() {
        System.out.println("新增用户");
    }

    @Override
    public void delete() {
        System.out.println("删除用户");
    }    
}

package com.oracle.advice;

import org.aspectj.lang.ProceedingJoinPoint;

//新建通知类
public class MyAdvice {
//    前置通知
    public void before(){
        System.out.println("这是前置通知");
    }
//    后置通知
    public void afterReturning(){
        System.out.println("这是后置通知");
    }
//    环绕通知 返回值是个obj类型
    public Object around(ProceedingJoinPoint pjp) throws Throwable{
        System.out.println("环绕通知之前调用");
        Object obj=pjp.proceed();
        System.out.println("环绕之后调用");
        return pjp;        
    }
//    异常通知
    public void afterException(){
        System.out.println("异常后调用 ");
    }
//    后置通知(不管是否异常都调用 )
    public void after(){
        System.out.println("后置通知目标方法执行后调用");
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd ">
    <!-- 配置注解扫描 -->
    <context:component-scan base-package="com.oracle.pojo"></context:component-scan>
    <bean name="car2" class="com.oracle.pojo.Car"></bean>
    <!-- 配置目标对象 -->
    <bean name="userService" class="com.oracle.service.UserServiceImp"></bean>
    <!-- 配置通知对象 -->
    <bean name="myadvice" class="com.oracle.advice.MyAdvice"></bean>
    <aop:config>
    <!--配置切入点
        public void com.oracle.service.UserServiceImp.save()
        void com.oracle.service.UserServiceImp.save()
        * com.oracle.service.UserServiceImp.save()
        * com.oracle.service.UserServiceImp.*()
        
        * com.oracle.service.*ServiceImp.*(..)
                
      -->
      <aop:pointcut expression="execution(* com.oracle.service.*ServiceImp.*(..))" id="pc"/>
      <aop:aspect ref="myadvice">
              <!--指定名为before的方法作为前置通知  -->
              <aop:before method="before" pointcut-ref="pc"/>
              <!--后置  -->
              <aop:after-returning method="afterReturning" pointcut-ref="pc"/>
              <!--环绕通知  -->
              <aop:around method="around" pointcut-ref="pc"/>
              <!--异常拦截通知  -->
              <aop:after-throwing method="afterException" pointcut-ref="pc"/>
              <!--后置  -->
              <aop:after method="after" pointcut-ref="pc"/>          
      </aop:aspect>
</aop:config>
</beans>

package com.oracle.test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.oracle.service.UserService;
//@表示注解,将约束注解到容器
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class Demo01 {
    @Autowired
    private UserService userService;
    @Test
    public void get(){
        userService.get();
    }
}