手撕Spring5框架（七）基于XML配置文件方式实现AOP具体操作

1. 创建类，被增强类和增强类

package org.learn.spring5.service;

public interface UserService {
    void add();
    void del();
    void update();
    void query();
}

package org.learn.spring5.service.impl;

import org.learn.spring5.service.UserService;


 public class UserServiceImpl implements UserService {

    public void add() {
        //int i=10/0;
        System.out.println("add");
    }
    public void del() {
        System.out.println("del");
    }

    public void update() {
        System.out.println("update");
    }

    public void query() {
        System.out.println("query");
    }
}

package org.learn.spring5.service.impl;

import org.aspectj.lang.ProceedingJoinPoint;

//增强类，编写增强的方法

public class UserServiceProxy {
    public void before(){
    System.out.println("before");
}
    public void after(){
    System.out.println("After");
}
    public void afterReturning(){
        System.out.println("afterReturning");
    }
    public void afterThrowing(){
        System.out.println("AfterThrowing");
    }
    public void around(ProceedingJoinPoint proceedingJoinPoint){
        System.out.println("环绕之前");
        try {
            proceedingJoinPoint.proceed();
        } catch (Throwable throwable) {
            throwable.printStackTrace();
        }
        System.out.println("环绕之后");
    }

}

   2. 配置XML文件 bean1.xml

1）创建对象

2）配置AOP部分

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

    <!--Spring AOP操作，基于XML实现方式-->

    <!--对象创建-->
    <bean id="userServiceImpl" class="org.learn.spring5.service.impl.UserServiceImpl"></bean>
    <bean id="userServiceProxy" class="org.learn.spring5.service.impl.UserServiceProxy"></bean>

    <!-- 配置AOP增强-->
    <aop:config>
        <!--切入点-->
        <aop:pointcut id="p" expression="execution(* org.learn.spring5.service.impl.UserServiceImpl.add(..))"/>
        <!--配置切面-->
        <aop:aspect ref="userServiceProxy">
            <aop:before method="before" pointcut-ref="p"/>
            <aop:after method="after" pointcut-ref="p"/>
            <aop:after-returning method="afterReturning" pointcut-ref="p"/>
            <aop:after-throwing method="afterThrowing" pointcut-ref="p"/>
            <aop:around method="around" pointcut-ref="p"/>
        </aop:aspect>
    </aop:config>

</beans>

    3. 编写测试类

import org.junit.Test;
import org.learn.spring5.service.UserService;
import org.learn.spring5.service.impl.UserServiceImpl;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestSpring5 {

    /**
     * Spring AOP实现 基于XML方式
     */
    @Test
    public void test1(){
        ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
        UserService userService = context.getBean("userServiceImpl", UserService.class);
        userService.add();
    }

}