Spring基于代理类的AOP实现

迈不过友情╰ 2023-10-07 12:17 12阅读 0赞

ProxyFactoryBean是FactoryBean接口的实现类，FactoryBean负责实例化一个Bean, 而ProxyFactoryBean负 贵为其他Bean创建代理实例。在Spring中，使用ProxyFactoryBean是创建AOP代理的基本方式。  
案例：

*  目标类：

//目标类
    public class UserDaoImpl implements UserDao {
        
        @Override
        public void addUser() {
        
            System.out.println("添加用户");
        }
    
        @Override
        public void deleteUser() {
        
            System.out.println("删除用户");
        }
    }

*  切面类：

import org.aopalliance.intercept.MethodInterceptor;
    import org.aopalliance.intercept.MethodInvocation;
    
    //切面类
    public class MyAspect implements MethodInterceptor {
        
        @Override
        public Object invoke(MethodInvocation mi) throws Throwable {
        
            check_Permissions();
            //执行目标方法
            Object obj = mi.proceed();
            log();
            return obj;
        }
        public void check_Permissions(){
        
            System.out.println("模拟检查权限...");
        }
        public void log(){
        
            System.out.println("模拟记录日志...");
        }
    }

*  配置文件：

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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">
        
        <bean id="userDao" class="com.no5.proxyaop.UserDaoImpl"/>
        
        <bean id="myAspect" class="com.no5.proxyaop.MyAspect"/>
        
        <bean id="userDaoProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
            
            <property name="proxyInterfaces" value="com.no5.proxyaop.UserDao"/>
            
            <property name="target" ref="userDao"></property>
            
            <property name="interceptorNames" value="myAspect"/>
            
            <property name="proxyTargetClass" value="true"/>
        </bean>
    
    </beans>