Spring深入讲解实现AOP的三种方式

  <dependencies>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.9.1</version>
        </dependency>
    </dependencies>

<?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:p="http://www.springframework.org/schema/p" xmlns:c="http://www.springframework.org/schema/c"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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">
<!--    注册bean-->
    <bean id="userService" class="com.kero.service.UserServiceImpl"/>
    <bean id="log" class="com.kero.log.Log"/>
    <bean id="afterlLog" class="com.kero.log.AfterLog"/>
<!--    配置aop 需要导入aop的约束-->
    <aop:config>
<!--        切入点 expression表达式 expression(要执行的位置  )-->
        <aop:pointcut id="pointcut" expression="execution(* com.kero.service.UserServiceImpl.*(..))"/>
<!--        执行环绕增加-->
        <aop:advisor advice-ref="log" pointcut-ref="pointcut"/>
        <aop:advisor advice-ref="afterlLog" pointcut-ref="pointcut"/>
    </aop:config>
</beans>

import org.springframework.aop.MethodBeforeAdvice;
import java.lang.reflect.Method;
public class Log implements MethodBeforeAdvice {
//method:要执行的目标对象的方法
    //objects:参数
    //target:目标对象
    @Override
    public void before(Method method, Object[] args, Object target) throws Throwable {
        System.out.println(target.getClass().getName() + "的" + method.getName() + "被执行了");
    }
}
import org.springframework.aop.AfterReturningAdvice;
import java.lang.reflect.Method;
public class AfterLog implements AfterReturningAdvice {
    //method:要执行的目标对象的方法
    //objects:参数
    //target:目标对象
    //returnValue:返回值
    @Override
    public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
        System.out.println("执行了"+ method.getName() + "方法,返回结果为:"+returnValue);
    }
}

import org.springframework.stereotype.Service;
@Service
public interface UserService {
    public void add();
    public void delete();
    public void update();
    public void search();
}
public class UserServiceImpl implements UserService{
    @Override
    public void add() {
    }
    @Override
    public void delete() {
    }
    @Override
    public void update() {
    }
    @Override
    public void search() {
    }
}

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class test {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        //动态代理 代理的是接口
        UserService userService = context.getBean("userService", UserService.class);
        userService.add();
    }
}

<?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:p="http://www.springframework.org/schema/p" xmlns:c="http://www.springframework.org/schema/c"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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">
<!--    注册bean-->
    <bean id="userService" class="com.kero.service.UserServiceImpl"/>
    <bean id="log" class="com.kero.log.Log"/>
    <bean id="afterlLog" class="com.kero.log.AfterLog"/>
    <bean id="diy" class="com.kero.diy.DiyPointCut"/>
    <aop:config>
<!--        自定义切面 ref要引用的类-->
        <aop:aspect ref="diy">
<!--            切入点-->
            <aop:pointcut id="point" expression="execution(* com.kero.service.UserServiceImpl.*(..))"/>
<!--            通知-->
            <aop:before method="before" pointcut-ref="point"/>
            <aop:after method="after" pointcut-ref="point"/>
        </aop:aspect>
    </aop:config>
</beans>

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````");
    }
}

<?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:p="http://www.springframework.org/schema/p" xmlns:c="http://www.springframework.org/schema/c"
       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 https://www.springframework.org/schema/context/spring-context.xsd">
<!--    注册bean-->
    <bean id="userService" class="com.kero.service.UserServiceImpl"/>
    <bean id="log" class="com.kero.log.Log"/>
    <bean id="afterlLog" class="com.kero.log.AfterLog"/>
<!--    开启注解支持-->
    <aop:aspectj-autoproxy/>
    <bean id="annotationPointCut" class="com.kero.diy.AnnotationPointCut"/>
</beans>

import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
//使用注解方式实现AOP
@Aspect
//标注这个类是一个切面
public class AnnotationPointCut {
    @Before("execution(* com.kero.service.UserServiceImpl.*(..))")
    public void before(){
        System.out.println("````方法执行前````");
    }
    @After("execution(* com.kero.service.UserServiceImpl.*(..))")
    public void after(){
        System.out.println("````方法执行后````");
    }
}