spring ProxyFactoryBean简单使用

使用Spring的ProxyFactoryBean来拦截方法
先编写一个类这个类要implements MethodBeforeAdvice在这里我定义了一个MinstrelAdvice类implements MethodBeforeAdvice
MethodBeforeAdvice位置是org.springframework.aop.MethodBeforeAdvice

public class MinstrelAdvice implements MethodBeforeAdvice {

	public void before(Method method, Object[] obj, Object target)
			throws Throwable {
		Knight knight = (Knight) target;
		Logger song = Logger.getLogger(target.getClass());
		System.out.println("MinstrelAdvice running.........");
		song.debug("Brave " + knight.getName() + " did " + method.getName());
	}

}

然后配置applicationContext.xml文件

<bean id="quest" class="com.springinaction.chapter01.knight.HolyGrailQuest"></bean>
	
	<bean id="knightTarget" class="com.springinaction.chapter01.knight.KnightOfTheRoundTable">
		<constructor-arg>
			<value>Bedivere</value>
		</constructor-arg>
		<property name="quest">
			<ref bean="quest"/>
		</property>
	</bean>
	
	<bean id="new" class="com.springinaction.chapter01.knight.New"></bean>
	
	<bean id="minstrel" class="com.springinaction.chapter01.knight.MinstrelAdvice">
	</bean>
	
	<bean id="knight" class="org.springframework.aop.framework.ProxyFactoryBean">
		<property name="proxyInterfaces">
			<list><!-- 拦截Knight的方法   是一个接口类 -->
				<value>com.springinaction.chapter01.knight.Knight</value>
			</list>
		</property>
		
		<property name="interceptorNames">
			<list>
				<value>minstrel</value><!-- 先让minstrel处理请求 -->
			</list>
		</property>
		
		<property name="target">
			<ref bean="knightTarget"/> <!-- 再让knightTarget处理 -->
		</property>
</bean>

使用ProxyFactoryBean来拦截Knight子类中的方法,定义interceptorNames属性让minstrel先处理请求,再定义target属性让knightTarget处理,这样我们就可以在使用Knight接口的子类时做一些提前的外理了,比如获得日志类Logger和不拦截的状态下所调用的方法.