步骤拦截器：MethodInterceptor

方法拦截器：MethodInterceptor
MethodInterceptor  --> org.springframework.aop.support.RegexpMethodPointcutAdvisor
ThrowsAdvice --> org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator

http://hi.baidu.com/loving102/blog/item/bf1395d3d9ddbd093bf3cfaf.html
实现MethodInterceptor接口，在调用目标对象的方法时，就可以实现在调用方法之前、调用方法过程中、调用方法之后对其进行控制。
MethodInterceptor接口可以实现MethodBeforeAdvice接口、AfterReturningAdvice接口、ThrowsAdvice接口这三个接口能够所能够实现的功能，但是应该谨慎使用MethodInterceptor接口，很可能因为一时的疏忽忘记最重要的MethodInvocation而造成对目标对象方法调用失效，或者不能达到预期的设想。
关于含有Advice的三种对目标对象的方法的增强

例子参考: http://www.360doc.com/content/07/0827/10/18042_697579.shtml

源代码
---------------------------------------------
MyMethodInterceptor.java

package com.app.aop;

import java.util.Date;

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

public class MyMethodInterceptor implements MethodInterceptor {

	/*
	public Object invoke(MethodInvocation invoke) throws Throwable {
		// TODO Auto-generated method stub
		System.out.println("Proceed start time:"+(new Date()));
		Object result = invoke.proceed();
		System.out.println("Proceed end time:"+(new Date()));
		return result;
	}*/
	public Object invoke(MethodInvocation invoke) throws Throwable {
		// TODO Auto-generated method stub
		System.out.println("\nProceed start time:"+(new Date()));
		try {
			Object result = invoke.proceed();
			return result;
		}finally{
			System.out.println("Proceed end time:"+(new Date()));
		}
	}

}

注:注释掉的那部分,有问题，一定要用try{......}finally{......}的方式来使用,否则可能会出问题。比如注释的那部分,只能打印第一个system.out.println(),不能打印第二个的!



applicationContext.xml

<bean id="myMethodInterceptor" class="com.app.aop.MyMethodInterceptor"></bean>
	<bean id="timeHandlerAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
        <property name="advice">
            <ref bean="myMethodInterceptor"/>
        </property>
        <property name="patterns">
            <value>com.app.aop.BizProcessImpl.*</value>
        </property>
    </bean> 

测试例子:

package com.app.aop;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class AopTest {
	public static void main(String[] args) {
		ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
		//IBizProcessImpl t = ctx.getBean("bizOne",IBizProcessImpl.class);
		IBizProcessImpl t = ctx.getBean("bizOneTarget",IBizProcessImpl.class);
		try {
			t.doAnotherThing();
		} catch (Exception e) {
			// TODO: handle exception
		}
		
	}

}

结果显示：
Proceed start time:Mon Jul 18 10:15:27 CST 2011
doAnotherThing-->
Proceed end time:Mon Jul 18 10:15:27 CST 2011