Spring AOP小例子

拼搏现实的明天。 2022-06-15 01:52 139阅读 0赞

Spring AOP可以实现在原有的业务代码中加入一些输出，不改变原来的代码，比如日志

/**
     * 业务类
     */
    public class AspectBiz {
        public void biz(){
            System.out.println("AspectBiz biz.");
            throw new RuntimeException();
        }
    }

/**
     * 日志类
     */
    public class MoocAspect {
        public  void before(){
            System.out.println("MoocAspect before.");
        }
        public void afterReturning(){
            System.out.println("MoocAspect afterReturing.");
        }
        public void afterThroing(){
            System.out.println("MoocAspect afterThrowing.");
        }
        public void after(){
            System.out.println("MoocAspect after.");
        }
    }

<?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 http://www.springframework.org/schema/aop/spring-aop.xsd">
        
        <bean id="moocAspect" class="com.mr.three.MoocAspect"></bean>
        
        <bean id="aspectBiz" class="com.mr.three.AspectBiz"/>
        <aop:config>
            
            <aop:aspect id="moocAspectAOP" ref="moocAspect">
                
                <aop:pointcut expression="execution(* com.mr.three.*Biz.*(..))" id="moocPointcut"/>
                
                <aop:before method="before" pointcut-ref="moocPointcut"/>
                <aop:after-returning method="afterReturning" pointcut-ref="moocPointcut"/>
                <aop:after-throwing method="afterThroing" pointcut-ref="moocPointcut"/>
                <aop:after method="after" pointcut-ref="moocPointcut"/>
            </aop:aspect>
        </aop:config>
    </beans>

测试：

public class AdviceTest {
        @Test
        public void beforeTest(){
            ApplicationContext context=new ClassPathXmlApplicationContext("spring-injection.xml");
            AspectBiz biz=(AspectBiz)context.getBean("aspectBiz");
            biz.biz();
        }
    }

结果：

MoocAspect before.  
AspectBiz biz.  
MoocAspect afterThrowing.  
MoocAspect after.