Spring AOP小例子-蒲公英云

Spring AOP小例子

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">
    <!-- 我们要插入的日志等-->
    <bean id="moocAspect" class="com.mr.three.MoocAspect"></bean>
    <!--业务bean-->
    <bean id="aspectBiz" class="com.mr.three.AspectBiz"/>
    <aop:config>
        <!-- 用到哪个处理类-->
        <aop:aspect id="moocAspectAOP" ref="moocAspect">
            <!-- 切点，要插入到什么地方，expression可以为包，类和方法-->
            <aop:pointcut expression="execution(* com.mr.three.*Biz.*(..))" id="moocPointcut"/>
            <!-- 切点之前-->
            <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();
    }
}