spring AOP的學(xué)習(xí)

@autor:韓克?2019-07-19 21:09:44

方式一：使用bean生成Proxy的方式（jdk動(dòng)態(tài)代理方式）

1. 創(chuàng)建目標(biāo)類接口

使用bean生成Proxy的方式底層使用的是jdk動(dòng)態(tài)代理力麸，所以需要?jiǎng)?chuàng)建接口至壤。

public interface EmployeeService {
    public void dosome();
}

2.創(chuàng)建目標(biāo)類利诺，實(shí)現(xiàn)相應(yīng)的接口

public class EmployeeServiceImpl implements EmployeeService{

@Override
public void dosome() {
    System.out.println("員工工作中....");        
}

@Override
public void playGame() {
    System.out.println("趁老板不在翁脆，玩會(huì)游戲...");
}
    
}

3.創(chuàng)建通知類，實(shí)現(xiàn)相應(yīng)的接口，在重寫(xiě)方法中寫(xiě)相應(yīng)的通知尘执。

前置通知：implements MethodBeforeAdvice

package com.xt.advice;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class EmpBeforeAdvice implements MethodBeforeAdvice{
    @Override
    public void before(Method arg0, Object[] arg1, Object arg2) throws Throwable {

        System.out.println("記錄員工行為....");
        
    }

}

后置通知：implements AfterReturningAdvice

package com.xt.advice;

import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;

public class EmpAfterAdvice implements AfterReturningAdvice{

    @Override
    public void afterReturning(Object arg0, Method arg1, Object[] arg2, Object arg3) throws Throwable {
        
        System.out.println("攝像頭已記錄用戶行為...");
        
    }
    
}

4.配置applicationContext.xml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"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="empAfterAdvice" class="com.xt.advice.EmpAfterAdvice"></bean>
    <bean id="empBeforeAdvice" class="com.xt.advice.EmpBeforeAdvice"></bean>
    <bean id="employeeServiceImpl" class="com.xt.service.impl.EmployeeServiceImpl"></bean>
    <bean id="regExpAfterAdvice" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
        <property name="patterns">
            <list>
                <value>.*dosome.*</value>
            </list>
        </property>
        <property name="advice" ref="empAfterAdvice"></property>
    </bean>
    <bean id="regExpBeforeAdvice" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
        <property name="patterns" value=".*dosome.*"></property>
        <property name="advice" ref="empBeforeAdvice"></property>
    </bean>
    <bean id="empProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
        <property name="target" ref="employeeServiceImpl"></property>
        <property name="interfaces" value="com.xt.service.EmployeeService"></property>
        <property name="interceptorNames">
            <list>
                <value>regExpAfterAdvice</value> 
                <value>regExpBeforeAdvice</value> 
            </list>
        </property>
    </bean> 
</beans>

方式二：AspectJ注解方式（通過(guò)cglib動(dòng)態(tài)代理實(shí)現(xiàn)）

一、創(chuàng)建目標(biāo)對(duì)象,在目標(biāo)對(duì)象中不需要使用任何注解宴凉。

package com.xt.pojo;

public class Tauren {
    public void buyHP(){
        System.out.println("戰(zhàn)士買HP");
    }
    
    public void buyMP() {
        System.out.println("戰(zhàn)士買MP");
    }
    
    public void combat() {
        System.out.println("斗牛士在戰(zhàn)斗");
    }
}

二誊锭、創(chuàng)建切面

package com.xt.advice;

import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
/* @Aspect:用來(lái)聲明切面，寫(xiě)在通知類 */
@Aspect
public class Shop {
    //前置增強(qiáng) 
    /* 注意括號(hào)的匹配弥锄，execution不要寫(xiě)錯(cuò)丧靡！ */
    @Before("execution(* com.xt.pojo.Tauren.buy*(..))")
    public void buybefore(){
        System.out.println("玩家進(jìn)入商店！");
    }
    //后置增強(qiáng)
    @After("execution(* com.xt.pojo.Tauren.buy*(..))")
    public void buyAfter(){
        System.out.println("藥水添加到背包籽暇！");
    }
}

三温治、在applicationContext.xml中注冊(cè)目標(biāo)和切面

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

    <!-- 注冊(cè)目標(biāo)類 -->
    <bean id="tauren" class="com.xt.pojo.Tauren"></bean>
    <!-- 注冊(cè)切面 -->
    <bean id="shop" class="com.xt.advice.Shop"></bean>
    <!-- 注冊(cè)自動(dòng)代理 -->
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
    
</beans>

四、測(cè)試

package com.xt.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.xt.pojo.Tauren;

public class Test {
    @org.junit.Test
    public void test() {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");       
        Tauren tauren = (Tauren) applicationContext.getBean("tauren",Tauren.class);//注意使用目標(biāo)類
        tauren.buyHP();
        tauren.buyMP();
        tauren.combat();
    }
}