Spring AOP概念學習（二）-單獨代理

      這幾天一直沒有時間寫博客，今天正好抽空，現在繼續上一篇文章，來整理一下個人心得，希望可以給初學者幫助，即使沒有幫助，也希望大家共同交流。

      下面開始進入正題，這篇文章主要講解的是有關於Spring AOP中的Advices的實現，首先介紹的是通過接口實現的advice，其餘實現將在後面幾篇文章中介紹。

      1、定義基本的advice Bean以及要被調用的類

 

    定義Advice Bean

package com.javaeye.sunjiesh.aop;

import java.lang.reflect.Method;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.aop.AfterReturningAdvice;
import org.springframework.aop.MethodBeforeAdvice;
import org.springframework.aop.ThrowsAdvice;

public class AdviceTest implements MethodBeforeAdvice,AfterReturningAdvice,MethodInterceptor,ThrowsAdvice{

	/**
	 * 調用方法之前執行
	 * Before Advice
	 */
	@Override
	public void before(Method arg0, Object[] arg1, Object arg2)
			throws Throwable {
		System.out.println("調用before");
	}

	/**
	 * 調用方法之後執行
	 * After Advice
	 */
	@Override	
	public void afterReturning(Object arg0, Method arg1, Object[] arg2,
			Object arg3) throws Throwable {
		System.out.println("調用afterReturning");
	}

	/**
	 * Around Advice
	 */
	@Override
	public Object invoke(MethodInvocation arg0) throws Throwable {
		Object result=null;
		System.out.println("around 調用before之前");
		
		result=arg0.proceed();
		
		System.out.println("around 調用afterReturning之後");
		return result;
	}
	
	public void afterThrowing(Method method,Object[] args,Object target,Throwable subclass) {
    	System.out.println("ThrowAdvice 記錄異常...........");
    }
	
}

 

    接口類

package com.javaeye.sunjiesh.proxy;

public interface IHello {

	void hello();
	
	void helloA(String a);
	
	void helloB(String b);
}

 

    實現類

package com.javaeye.sunjiesh.proxy;

public class HelloImpl implements IHello {

	@Override
	public void hello() {
		// TODO Auto-generated method stub
		System.out.println("hello in HelloImpl");
	}

	@Override
	public void helloA(String a) {
		// TODO Auto-generated method stub
		System.out.println("helloA in HelloImpl,parameter is "+a);
	}

	@Override
	public void helloB(String b) {
		// TODO Auto-generated method stub
		System.out.println("helloB in HelloImpl,parameter is "+b);
	}

}

 

      2、在配置文件中聲明我們的bean(文件名：spring-beans.xml)

<?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:tx="http://www.springframework.org/schema/tx"
		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/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
<!-- 代理 -->
	<bean id="helloImpl" class="com.javaeye.sunjiesh.proxy.HelloImpl"></bean>

<!-- 聲明四種通知類型,其實就是你想加入到其他被代理程序執行邏輯中的代碼 -->
	<bean id="adviceTest" class="com.javaeye.sunjiesh.aop.AdviceTest" />
<!-- 基礎的通知使用，這裏強行給helloSpeaker1加上了advice通知 -->
	<bean id="aaa" class="org.springframework.aop.framework.ProxyFactoryBean">
		<property name="target" ref="helloImpl"></property>
		<property name="interceptorNames">
			<list>
				<value>adviceTest</value>
			</list>
		</property>
	</bean>
</beans>

 

    3、在main函數中調用

package com.javaeye.sunjiesh.aop;

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

import com.javaeye.sunjiesh.proxy.IHello;

public class AopMain {

	/** 對於給基本的spring bean強行指定一批advice方法的調用展示 **/
	public static void main(String[] args) {
		ApplicationContext ctx = new ClassPathXmlApplicationContext(
				"spring-beans.xml");
		IHello h = (IHello) ctx.getBean("aaa");
		h.helloA("測試一");

		System.out.println("======開始進行測試二=========");
		try {
			h.helloB("測試二");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

 

    4、控制檯的顯示

around 調用before之前
調用before
helloA in HelloImpl,parameter is 測試一
調用afterReturning
around 調用afterReturning之後
======開始進行測試二=========
around 調用before之前
調用before
helloB in HelloImpl,parameter is 測試二
調用afterReturning
around 調用afterReturning之後

 

    備註：如果Advice Bean實現ThrowsAdvice接口，則一定要實現afterThrowing方法，否則會報錯。