springAOP实现（含实例）

需要用到的jar包：

1.XML方式实现：

package cn.lxc.post;

public class Intermediary {
    
    public void post(){
        System.out.println("该房源已发布！");
    }
}

package cn.lxc.service;

public interface Rent {
    public void rent();
}

package cn.lxc.service.impl;

import cn.lxc.service.Rent;

public class Landlord implements Rent{

    @Override
    public void rent() {
        System.out.println("房东：我要出租房子了！");
    }
}

package cn.lxc.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.lxc.service.Rent;


public class Test {
    public static void main(String[] args) {
        ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
        Rent r = ac.getBean(Rent.class);
        try {
            r.rent();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

beans.xml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:p="http://www.springframework.org/schema/p"
    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">
    <!-- 目标对象 -->
    <bean id="rent" class="cn.lxc.service.impl.Landlord"/>
    <!-- 切面 -->
    <bean id="intermediary" class="cn.lxc.post.Intermediary"/>
    <aop:config>
        <aop:aspect ref="intermediary">
            <aop:before method="post" pointcut-ref="pointcut"/>
            <aop:pointcut id="pointcut" expression="execution(* cn.lxc.service.impl.*.*(..))" />
        </aop:aspect>
    </aop:config>
</beans>

 2.注解方式：

package cn.lxc.post;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

@Aspect
public class Intermediary {
    @Before("execution(* cn.lxc.service.impl.*.*(..))")
    public void post(){
        System.out.println("该房源已发布！");
    }
}

applicationContext.xml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:p="http://www.springframework.org/schema/p"
    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">
    <!-- 目标对象 -->
    <bean id="rent" class="cn.lxc.service.impl.Landlord"/>
    <!-- 切面 -->
    <bean id="intermediary" class="cn.lxc.post.Intermediary"/>
    <!-- 自动代理 -->
    <aop:aspectj-autoproxy/>
</beans>

测试类：

package cn.lxc.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.lxc.service.Rent;


public class Test {
    public static void main(String[] args) {
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        Rent r = ac.getBean(Rent.class);
        try {
            r.rent();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}