基于注解的AOP开发

目标接口

package com.itheima.anno;

public interface TargetInterface {

    public void save();

}

目标接口实现类

package com.itheima.anno;

import org.springframework.stereotype.Component;

@Component("target")
public class Target implements TargetInterface {
    public void save() {
        System.out.println("save running.....");
    }
}

切面类

package com.itheima.anno;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;

@Component("myAspect")
@Aspect //标注当前MyAspect是一个切面类
public class MyAspect {

    //配置前置通知
    //@Before("execution(* com.itheima.anno.*.*(..))")
    public void before(){
        System.out.println("前置增强..........");
    }

    public void afterReturning(){
        System.out.println("后置增强..........");
    }

    //Proceeding JoinPoint:  正在执行的连接点===切点
    //@Around("execution(* com.itheima.anno.*.*(..))")
    @Around("pointcut()")
    public Object around(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("环绕前增强....");
        Object proceed = pjp.proceed();//切点方法
        System.out.println("环绕后增强....");
        return proceed;
    }

    public void afterThrowing(){
        System.out.println("异常抛出增强..........");
    }

    //@After("execution(* com.itheima.anno.*.*(..))")
    @After("MyAspect.pointcut()")
    public void after(){
        System.out.println("最终增强..........");
    }

    //定义切点表达式
    @Pointcut("execution(* com.itheima.anno.*.*(..))")
    public void pointcut(){}

}

测试类

package com.itheima.test;

import com.itheima.anno.TargetInterface;
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;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext-anno.xml")
public class AnnoTest {

    @Autowired
    private TargetInterface target;

    @Test
    public void test1(){
        target.save();
    }


}

Spring配置文件

<?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"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
">

    <!--组件扫描-->
    <context:component-scan base-package="com.itheima.anno"/>

    <!--aop自动代理-->
    <aop:aspectj-autoproxy/>

</beans>