spring——AOP面向切面编程—— 基于 PointcutAdvisor 的 AOP 开发

Bertha 。 2024-03-31 17:34 170阅读 0赞

项目依赖：

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>org.example</groupId>
        <artifactId>ssw</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <properties>
            <maven.compiler.source>8</maven.compiler.source>
            <maven.compiler.target>8</maven.compiler.target>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>5.3.6</version>
            </dependency>
        </dependencies>
    
    </project>

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创建OrderDao类：

package org.example.dao;
    
    public class OrderDao {
    
        public void add() {
            System.out.println("正在执行 UserDao 的 add() 方法……");
        }
        public void adds() {
            System.out.println("正在执行 UserDao 的 adds() 方法……");
        }
        public void delete() {
            System.out.println("正在执行 UserDao 的 delete() 方法……");
        }
        public void modify() {
            System.out.println("正在执行 UserDao 的 modify() 方法……");
        }
        public void get() {
            System.out.println("正在执行 UserDao 的 get() 方法……");
        }
    }

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创建环绕增强类，OrderDaoAroundAdvice ：

package org.example.advice;
    
    import org.aopalliance.intercept.MethodInterceptor;
    import org.aopalliance.intercept.MethodInvocation;
    /**
     * 增强代码
     * 环绕增强
     *
     * @author c语言中文网 c.biancheng.net
     */
    public class OrderDaoAroundAdvice implements MethodInterceptor
    {
    
        @Override
        public Object invoke(MethodInvocation methodInvocation) throws Throwable
        {
    
            System.out.println("环绕增强前********");
    
            //执行被代理对象中的逻辑
            Object result = methodInvocation.proceed();
    
            System.out.println("环绕增强后********");
    
            return result;
        }
    }

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修改bean.xml：

<?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:context="http://www.springframework.org/schema/context"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context
                http://www.springframework.org/schema/context/spring-context.xsd">
    
        
        
        <bean id="orderDao" class="org.example.dao.OrderDao"></bean>
        
        <bean id="aroundAdvice" class="org.example.advice.OrderDaoAroundAdvice"></bean>
        
        <bean id="myPointCutAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
            
            
            <property name="patterns" value="org.example.dao.OrderDao.add.*,org.example.dao.OrderDao.delete.*"></property>
            <property name="advice" ref="aroundAdvice"></property>
        </bean>
        
        <bean id="orderDaoProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
            
            <property name="target" ref="orderDao"></property>
            
            <property name="proxyTargetClass" value="true"></property>
            
            <property name="interceptorNames" value="myPointCutAdvisor"></property>
        </bean>
    
    </beans>

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执行：

package org.example;
    
    import org.example.dao.OrderDao;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Main
    {
    
        public static void main(String[] args)
        {
    
            //获取 ApplicationContext 容器
            ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
    
            //获取代理对象
            OrderDao orderDao = context.getBean("orderDaoProxy", OrderDao.class);
    
            //调用 OrderDao 中的各个方法
            orderDao.add();
            orderDao.adds();
            orderDao.delete();
            orderDao.get();
            orderDao.modify();
        }
    }

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