在配置Spring AOP时，可以使用

@H_404_3@org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator

来完成目标服务的拦截。
比如：

@H_404_3@<bean id="serviceInteceptorProxyCreator" class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator"> <property name="interceptorNames"> <list> <value>helloServiceAOP</value> </list> </property> <property name="beanNames"> <value> helloService </value> </property> </bean> <bean id="helloServiceAOP" class="com.bing.aoptest.aop.HelloServiceAOP" /> <bean id="helloService" class="com.bing.aoptest.service.HelloServiceImpl"></bean>

会在helloService的方法执行之前，先执行helloServiceAOP。
HelloServiceImpl定义如下：

@H_404_3@package com.bing.aoptest.service; public class HelloServiceImpl implements HelloService { public void say() { System.out.println("Hello"); } }

HelloServiceAOP定义如下：

@H_404_3@package com.bing.aoptest.aop; import java.lang.reflect.Method; import org.aopalliance.intercept.MethodInterceptor; import org.aopalliance.intercept.MethodInvocation; public class HelloServiceAOP implements MethodInterceptor { public Object invoke(MethodInvocation invocation) throws Throwable { System.out.println("\nHelloServiceAOP: " + invocation.getMethod().getDeclaringClass().getName()); return invocation.proceed();//放行,调用目标方法 } }

那么，如果定义了两个BeanNameAutoProxyCreator会怎么样呢？
xml配置如下：

@H_404_3@<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="helloService" class="com.bing.aoptest.service.HelloServiceImpl"></bean> <bean id="serviceInteceptorProxyCreator2" class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator"> <property name="interceptorNames"> <list> <value>helloServiceInterceptor</value> </list> </property> <property name="beanNames"> <value> helloService </value> </property> </bean> <bean id="serviceInteceptorProxyCreator" class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator"> <property name="interceptorNames"> <list> <value>helloServiceAOP</value> </list> </property> <property name="beanNames"> <value> helloService </value> </property> </bean> <bean id="helloServiceAOP" class="com.bing.aoptest.aop.HelloServiceAOP" /> <bean id="helloServiceInterceptor" class="com.bing.aoptest.aop.HelloServiceInterceptor" /> </beans>

helloServiceAOP和helloServiceInterceptor都拦截目标对象，但定义在不同的BeanNameAutoProxyCreator里面。

helloServiceAOP定义如下：

package com.bing.aoptest.aop;

import java.lang.reflect.Method;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

public class HelloServiceAOP implements MethodInterceptor {

public Object invoke(MethodInvocation invocation) throws Throwable {
    System.out.println("\nHelloServiceAOP: "
            + invocation.getMethod().getDeclaringClass().getName());
    Method m = AOPUtil.getMethod(invocation);
    System.out.println("HelloServiceAOP,method对象:" + m);
    System.out.println("HelloServiceAOP,invocation对象:" + invocation);
    return invocation.proceed();
}

}

helloServiceInterceptor定义如下：

@H_404_3@package com.bing.aoptest.aop; import java.lang.reflect.Method; import org.aopalliance.intercept.MethodInterceptor; import org.aopalliance.intercept.MethodInvocation; public class HelloServiceInterceptor implements MethodInterceptor { public Object invoke(MethodInvocation invocation) throws Throwable { System.out.println("\nHelloServiceInterceptor: " + invocation.getMethod().getDeclaringClass().getName()); Method m = AOPUtil.getMethod(invocation); System.out.println("HelloServiceInterceptor,method对象:" + m); System.out.println("HelloServiceInterceptor,invocation对象:" + invocation); return invocation.proceed(); } }

调用方法：

@H_404_3@package com.bing.aoptest; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.bing.aoptest.service.HelloService; /** * Hello world! * */ public class App { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext( "applicationContext.xml"); HelloService hs = (HelloService) context.getBean("helloService"); hs.say(); } }

输出结果：

@H_404_3@HelloServiceAOP: com.bing.aoptest.service.HelloService HelloServiceAOP,method对象:public final void com.sun.proxy.$Proxy0.say() HelloServiceAOP,invocation对象:ReflectiveMethodInvocation: public abstract void com.bing.aoptest.service.HelloService.say(); target is of class [com.sun.proxy.$Proxy0] HelloServiceInterceptor: com.bing.aoptest.service.HelloService HelloServiceInterceptor,method对象:public void com.bing.aoptest.service.HelloServiceImpl.say() HelloServiceInterceptor,invocation对象:ReflectiveMethodInvocation: public abstract void com.bing.aoptest.service.HelloService.say(); target is of class [com.bing.aoptest.service.HelloServiceImpl] Hello

请注意：
HelloServiceAOP,method对象:public final void com.sun.proxy.$Proxy0.say()
HelloServiceInterceptor,method对象:public void com.bing.aoptest.service.HelloServiceImpl.say()

为什么method对象不都是public void com.bing.aoptest.service.HelloServiceImpl.say()呢？

原因
定义了两个org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator，按照顺序分别计作A，B，A会为目标对象T生成代理对象P1，B会为P1生成代理对象P2，代理逻辑就变成：
P2代理P1，P1代理T，而不是P2、P1都代理T。

所以，调用T的方法时，应该先执行P1，但P2代理了P1，最终先执行P2，再执行P1，在执行T。

这种情况下，如果T的方法上有注解，只有P1能够拿到注解信息，P2是拿不到的。

所以，不要定义个多个org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator的bean。