Spring之基于注解的AOP开发

学习目标

学习基于注解的aop开发，掌握其开发流程

一、开发步骤

前两步自行创建，这里省略。

3-4步骤：

//切面类：
@Component("myAspect")
@Aspect //表示当前类是一个切面
public class MyAspect {
    //配置前置 通知
    @Before("execution(* com.itheima.anno.*.*(..))")

//目标类：
@Component("target")

public class Target implements TargetInterface {
    public void save() {

        ///int i=1/0;
        System.out.println("target running.....");
    }
}

5. 配置文件代码

<?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"></context:component-scan>

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


</beans>

6. 测试代码

package com.itheima.test.aop;

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();
        }
    }

7. 运行结果

二、注解的详细类型

1. 注解通知的类型

2. 切点表达式的抽取

@Pointcut("execution(* com.itheima.anno.*.*(..))")
public void pointcut(){}

//@Around("execution(* com.itheima.anno.*.*(..))")
@Around("MyAspect.pointcut()")
public Object Around(ProceedingJoinPoint pjp) throws Throwable {

    System.out.println("环绕前。。。。");
    //切点
   Object obj= pjp.proceed();
    System.out.println("环绕后。。。。");
    return obj;
}