Spring实现AOP的三种方式

导包
Spring接口实现
自定义类实现
注解实现

Spring的动态代理代理的是接口
使用注解进行bean依赖注入时需要设置注解扫描范围
使用注解实现AOP时导包选择import org.aspectj.lang.annotation.Aspect;

导包

虽然aop包中提供了AOP功能，但是它是依赖aspectj来实现的；
如果没有导这个包而使用切面插入功能会报错：org.aspectj.weaver.reflect.ReflectionWorld$ReflectionWorldException
本人就步入这个坑，在Spring中插入事务时没有导这个包，排了很久…

		<dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>
            <scope>compile</scope>
        </dependency>

Spring接口实现

业务接口

package com.tl.demo01;

/**
 * @author tl
 */
public interface Rent {
    public void rent();
    public void go();
    public void send();
}

业务接口实现类

package com.tl.demo01;

/**
 * @author tl
 */
public class Host implements Rent{
    public void rent() {
        System.out.println("租你3个月");
    }

    public void go() {
        System.out.println("走吧，不租了");
    }

    public void send() {
        System.out.println("不要钱，这房子送你了");
    }
}

API接口实现类

package com.tl.demo01;

import org.springframework.aop.MethodBeforeAdvice;

import java.lang.reflect.Method;

/**
 * @author tl
 */
public class Log implements MethodBeforeAdvice {
    public void before(Method method, Object[] objects, Object target) throws Throwable {
        System.out.println(target.getClass().getName()+"的"+method.getName()+"方法被执行了");
    }
}

package com.tl.demo01;

import org.springframework.aop.AfterReturningAdvice;

import java.lang.reflect.Method;

/**
 * @author tl
 */
public class AfterLog implements AfterReturningAdvice {
    public void afterReturning(Object returnValue, Method method, Object[] objects, Object target) throws Throwable {
        System.out.println(target.getClass().getName()+"的"
                +method.getName()+"方法被执行了"+"返回值为"+returnValue);
    }
}

配置

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

    
    <bean id="host" class="com.tl.demo01.Host"/>
    <bean id="log" class="com.tl.demo01.Log"/>
    <bean id="afterlog" class="com.tl.demo01.AfterLog"/>
    
    <aop:config>
        <aop:pointcut id="tl" expression="execution(* com.tl.demo01.Host.*(..))"/>
        <aop:advisor advice-ref="log" pointcut-ref="tl"/>
        <aop:advisor advice-ref="afterlog" pointcut-ref="tl"/>
    </aop:config>

</beans>

测试

import com.tl.demo01.Host;
import com.tl.demo01.Rent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author tl
 */
public class Test {
    @org.junit.Test
    public void test1(){
        ApplicationContext context =
                new ClassPathXmlApplicationContext("beans.xml");
        //Spring的动态代理代理的是接口    
        Rent rent = (Rent)context.getBean("host");
        rent.send();
    }
}

在这里插入图片描述

自定义类实现

自定义切面类

package com.tl.demo01;

/**
 * @author tl
 */
public class DiyPointCut {
    public void before(){
        System.out.println("======方法执行前======");
    }

    public void after(){
        System.out.println("======方法执行后======");
    }

}

配置

<?xml version="1.0" encoding="UTF8"?>
<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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">

    <bean id="host" class="com.tl.demo01.Host"/>
    <bean id="diy" class="com.tl.demo01.DiyPointCut"/>

    <aop:config>
        <aop:aspect ref="diy">
            <aop:pointcut id="pointCut" expression="execution(* com.tl.demo01.Host.*(..))"/>
            <aop:before method="before" pointcut-ref="pointCut"/>
            <aop:after method="after" pointcut-ref="pointCut"/>
        </aop:aspect>
    </aop:config>
</beans>

测试

import com.tl.demo01.Rent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author tl
 */
public class Test {
    @org.junit.Test
    public void test1(){
        ApplicationContext context =
                new ClassPathXmlApplicationContext("beans.xml");
        //Spring的动态代理代理的是接口
        Rent rent = (Rent) context.getBean("host");
        rent.go();
    }
}

在这里插入图片描述

注解实现

业务接口实现类

package com.tl.demo01;


import org.springframework.stereotype.Component;

/**
 * @author tl
 */
@Component
public class Host implements Rent{
    public void rent() {
        System.out.println("租你3个月");
    }

    public void go() {
        System.out.println("走吧，不租了");
    }

    public void send() {
        System.out.println("不要钱，这房子送你了");
    }
}

自定义切面类（@Aspect）

package com.tl.demo01;

import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;


/**
 * @author tl
 */
@Component
@Aspect
public class AnnotationPointCut {
    @Before("execution(* com.tl.demo01.Host.*(..))")
    public void before(){
        System.out.println("======方法执行前======");
    }
    @After("execution(* com.tl.demo01.Host.*(..))")
    public void after(){
        System.out.println("======方法执行后======");
    }
}

配置

<?xml version="1.0" encoding="UTF8"?>
<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
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">
    <!--开启注解支持-->
    <aop:aspectj-autoproxy/>
    <!--开启注解扫描范围-->
    <context:component-scan base-package="com.tl"/>
<!--    <context:annotation-config/>-->
<!--    <bean id="host" class="com.tl.demo01.Host"/>-->
</beans>

测试

import com.tl.demo01.Rent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author tl
 */
public class Test {
    @org.junit.Test
    public void test1(){
            ApplicationContext context =
                    new ClassPathXmlApplicationContext("beans.xml");
            //Spring的动态代理代理的是接口
            Rent rent = (Rent) context.getBean("host");
            rent.send();
    }
}

在这里插入图片描述

原文链接：https://blog.csdn.net/weixin_43716907/article/details/123056792