Spring-AOP-通知-异常通知

素颜马尾好姑娘i 2022-06-18 11:41 373阅读 0赞

# AOP-通知-异常通知 #

#### 顾名思义，目标方法发生异常植入的切面   异常通知类需要实现`ThrowsAdvice`接口，你会发现`ThrowsAdvice`没有需要实现的方法      **在源码中有猫腻** ####

* <pre class="code">public void afterThrowing(Exception ex)</pre>
    * <pre class="code">public void afterThrowing(RemoteException)</pre>
    * <pre class="code">public void afterThrowing(Method method, Object[] args, Object target, Exception ex)</pre>
    * <pre class="code">public void afterThrowing(Method method, Object[] args, Object target, ServletException ex)</pre>
    *

**这当中有四个方法可以实现，下面我实现第一个**  
接口

package com.hk.spring.aop04;
    
    public interface SomeService {
    
        public void doFirst();
        public void doSecond();
    }

接口实现

package com.hk.spring.aop04;
    
    public class SomeServiceImpl implements SomeService { 
    
        @Override
        public void doFirst() {
    
            System.out.println("主业务doFirst");
            //搞个异常出来
            int a = 4;
            int b = 0;
            a = a / b;
        }
    
        @Override
        public void doSecond() {
    
            System.out.println("主业务doSecond");
        }
    
    }

异常通知

package com.hk.spring.aop04;
    
    
    import org.springframework.aop.ThrowsAdvice;
    
    /** * 异常通知 * @author 浪丶荡 * */
    public class MyThrowsAdvice implements ThrowsAdvice { 
    
        //在目标方法发异常时执行
        public void afterThrowing(Exception ex){
            System.out.println("执行异常通知方法：发生的异常是——"+ex.getMessage());
        }
    
    }

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.aop04.SomeServiceImpl"></bean>
        
        <bean name = "myThrowsAdvice" class="com.hk.spring.aop04.MyThrowsAdvice"></bean>
        
        <bean name = "serviceProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
        
        <property name="target" ref="someService"/>
        
        
        <property name="interceptorNames" value="myThrowsAdvice"/>
        
        </bean>
    
    </beans>

测试

package com.hk.spring.aop04;
    
    
    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/aop04/applicationContext.xml";
            ApplicationContext ac = new ClassPathXmlApplicationContext(resoure);
            SomeService someService = (SomeService) ac.getBean("serviceProxy");
            someService.doFirst();
            someService.doSecond();
        }
    }

结果

主业务doFirst
    执行异常通知方法：发生的异常是——/ by zero