Spring-AOP-通知-环绕通知

今天药忘吃喽~ 2022-06-18 11:41 339阅读 0赞

工程用到的jar包：[http://pan.baidu.com/s/1dFFw6at][http_pan.baidu.com_s_1dFFw6at]

## 接口 ##

package com.hk.spring.aop03;
    
    public interface SomeService {
    
        public void doFirst();
        public void doSecond();
    }

## 接口实现 ##

package com.hk.spring.aop03;
    
    public class SomeServiceImpl implements SomeService { 
    
        @Override
        public void doFirst() {
    
            System.out.println("主业务doFirst");
        }
    
        @Override
        public void doSecond() {
    
            System.out.println("主业务doSecond");
        }
    
    }

## 环绕通知类 ##

package com.hk.spring.aop03;
    
    
    import org.aopalliance.intercept.MethodInterceptor;
    import org.aopalliance.intercept.MethodInvocation;
    
    /** * 环绕通知 * @author 浪丶荡 * */
    public class MyMethodInterceptor implements MethodInterceptor { 
    
        //在目标方法执行前后都执行
        @Override
        public Object invoke(MethodInvocation invocation) throws Throwable {
            System.out.println("环绕通知被执行，目标方法执行之前");
            Object result = invocation.proceed();//调用目标方法
            System.out.println("环绕通知被执行，目标方法执行之后");
            return result;
        }
    
    
    }

## 配置文件 ##

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
    
    <beans>
        <bean name = "someService" class="com.hk.spring.aop03.SomeServiceImpl"></bean>
        
        <bean name = "myMethodInterceptor" class="com.hk.spring.aop03.MyMethodInterceptor"></bean>
        
        <bean name = "serviceProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
        
        <property name="target" ref="someService"/>
        
        
        <property name="interceptorNames" value="myMethodInterceptor"/>
        
        </bean>
    
    </beans>

## 测试 ##

package com.hk.spring.aop03;
    
    
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    public class Mytest {
    
        @Test
        public void test1(){
            String resoure = "com/hk/spring/aop03/applicationContext.xml";
            ApplicationContext ac = new ClassPathXmlApplicationContext(resoure);
            SomeService someService = (SomeService) ac.getBean("serviceProxy");
            someService.doFirst();
            someService.doSecond();
        }
    }

## 结果 ##

环绕通知被执行，目标方法执行之前
    主业务doFirst
    环绕通知被执行，目标方法执行之后
    环绕通知被执行，目标方法执行之前
    主业务doSecond
    环绕通知被执行，目标方法执行之后

与前置通知、后置通知不同的是导入的包不同，这个导入的是aop联盟的包  
  
环绕通知能获取到目标方法的返回值，且能够改变这个返回值

[http_pan.baidu.com_s_1dFFw6at]: http://pan.baidu.com/s/1dFFw6at