The main way to achive AOP is deploying a xml file。
Now a xml file is presented to be a explanation .
- <?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:context="http://www.springframework.org/schema/context"
- xmlns:aop="http://www.springframework.org/schema/aop"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
- http://www.springframework.org/schema/context
- http://www.springframework.org/schema/context/spring-context-2.5.xsd
- http://www.springframework.org/schema/aop
- http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
- <context:annotation-config />
- <context:component-scan base-package="com.bjsxt"/>
- <bean id="logInterceptor" class ="com.bjsxt.aop.LogInterceptor"></bean>
- <aop:config>
- <aop:pointcut
- expression="execution(public * com.bjsxt.service..*.add(..))"
- id="servicePointcut"/>
- <aop:aspect id="logAspect" ref="logInterceptor">
- <aop:before method="before" pointcut-ref="servicePointcut" />
- </aop:aspect>
- </aop:config>
- </beans>
The tag <aop:config> declares that we will deploy a aop now.
While,I declare a "pointcut" at first. It is obvIoUs that it's a globe pointcut and it works for every aspect behind it .
"expression="execution(public * com.bjsxt.service..*.add(..))" shows the pointcut represent all method like “add()” in the classes of the package named"com.bjsxt.service.."
the pointcut‘s id is “servicePointcut” in addition。
Next, a aspect is declared whose name is “logAspect” 。 (nobody care what name it has in this situation)。
- pointcut-ref="servicePointcut" shows that it is a aspect for the pointcut named “servicePointcut”which we had created a moment ago.
- Its ref = <span style="font-family: Arial,Helvetica,sans-serif;">"logInterceptor" ,so we can find a bean named logInterceptor to know what methods the aspect has。And according to the sentence “<aop:before method</span>
- <span style="font-family: Arial,sans-serif;">="before" ",I think we must do the method named "before" in "logIntercepor " as the type of" before method". It means the method woulb be done before pointcut.</span>
- <span style="font-family: Arial,sans-serif;">
- </span>
- <span style="font-family: Arial,sans-serif;">We can also complete the xml file in design mode。 It looks much more clear.</span>
- <span style="font-family: Arial,sans-serif;">
- </span>