Spring之切入点表达式

1)切入点表达式:可以对指定的"方法"进行拦截,从而给指定的类生成代理对象.

2)写法:

<?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:p="http://www.springframework.org/schema/p"
	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.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">

	<!-- dao实例 -->
	<bean id="userDao" class="com.bighuan.g_pointcut.UserDao"></bean>
	<bean id="orderDao" class="com.bighuan.g_pointcut.OrderDao"></bean>
	<!-- 切面类 -->
	<bean id="aop" class="com.bighuan.g_pointcut.Aop"></bean>

	<!-- Aop配置 -->
	<aop:config>
		<!-- 定义一个切入点表达式,拦截哪些方法 -->
		<!-- <aop:pointcut expression="execution(* com.bighuan.g_pointcut.*.*(..))" id="pt"/> -->
		
		<!-- 拦截所有公共方法 -->
		<!-- <aop:pointcut expression="execution(public * *(..))" id="pt"/> -->
		
		<!-- 拦截所有set开头的方法:execution(* set*(..)) -->
		<!-- <aop:pointcut expression="execution(* set*(..))" id="pt"/> -->
		
		<!-- 拦截指定类的指定方法,拦截时一定要定位到指定方法 -->
		<!-- <aop:pointcut expression="execution(* com.bighuan.g_pointcut.UserDao.save(..))" id="pt"/> -->
		<!-- 	<aop:pointcut expression="execution(public * com.bighuan.g_pointcut.UserDao.save(..))" id="pt"/> -->
		
		<!-- 拦截指定类的所有方法 -->
	<!-- 	<aop:pointcut expression="execution(* com.bighuan.g_pointcut.UserDao.*(..))" id="pt"/> -->
		
		<!-- 拦截指定包及其子包下的所有方法 -->
		<!-- <aop:pointcut expression="execution(* com..*(..))" id="pt"/> -->
		<!-- <aop:pointcut expression="execution(* com..*.*(..))" id="pt"/> -->
		
		
		<!-- 多个表达式:或有意义,且就无意义了 -->
		<!-- <aop:pointcut expression="execution(* com.bighuan.g_pointcut.UserDao.save(..)) || execution(* com.bighuan.g_pointcut.OrderDao.*(..))" id="pt"/> -->
			<!-- <aop:pointcut expression="execution(* com.bighuan.g_pointcut.UserDao.save(..)) or execution(* com.bighuan.g_pointcut.OrderDao.*(..))" id="pt"/> 同上-->
		
		<!-- 去非值 -->
		<aop:pointcut expression="!execution(* com.bighuan.g_pointcut.OrderDao.*(..))" id="pt"/>
		
		<!-- 切面类 -->
		<aop:aspect ref="aop">
			<!--  环绕通知-->
			<aop:around method="around" pointcut-ref="pt"/>
		</aop:aspect>
	</aop:config>
</beans>