Spring aop(实验写法)
1. 创建通知:定义一个接口
Public interface Sleepable { voidsleep(); }
然后写一个Human类,他实现了这个接口 publicHuman implements Sleepable{ public void sleep() { System.out.println("睡觉中...!"); } }
2.编写一个SleepHelper类,它里面包含了睡觉的辅助工作,用AOP术语来说它就应该是通知
Public class Sleep Helper implements MethodBeforeAdvice,AfterReturningAdvice { publicvoidbefore(Method method, Object[] arguments, Object target)throws Throwable { System.out.println("睡觉前"); } publicvoidafterReturning(Object rturnValue, Method method, Object[] arguments, Object target)throwsThrowable { System.out.println("睡觉后"); } }
然后在spring配置文件中进行配置:<!-- 被代理目标对象 -->
<bean id="Human"class="cn.happy.dao.Human"></bean> <bean id="SleepHelper"class="cn.happy.aop.SleepHelper"></bean>//定义切点的常用的两种方式:1)使用正则表达式 2)使用AspectJ表达式,//这里用正则表达式<!-- 顾问 -->
<bean id="BeforAdvisor"class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
<property name="advice" ref="BeforAdvice"></property> <property name="pattern" value=".*l.*g.*">
</property>
</bean><!-- 代理对象 -->//ProxyFactoryBean是一个代理,我们可以把它转换为//proxyInterfaces中指定的实现该interface的代理对象
<bean id="serviceProxy"class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="Human"></property>
<property name="interceptorNames" value="BeforAdvisor">
</property> </bean>代理类 publicclassStuTest {publicstaticvoidmain(String[] args)
{//通过ClassPathXmlApplicationContext实例化Spring的上下文
ApplicationContext context=newClassPathXmlApplicationContext("applicationContext.xml");
//通过ApplicationContext的getBean()方法,根据id来获取Bean的实例
Sleepable s=(Sleepable)context.getBean("Human");
s.sleep();
}
}