Spring AOP 2

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LogBeforeAdvice.java

package com.chapter8.advices;

import java.lang.reflect.Method;

import java.util.Date;

import java.text.SimpleDateFormat;

import java.util.Arrays;

import org.springframework.aop.MethodBeforeAdvice;

 

/**

* 前置通知

*

* @author Administrator

*

*/

public class LogBeforeAdvice implements MethodBeforeAdvice {

/**

* 实现接口中的方法

*

* @param arg0

* 目标方法的名称

* @param arg1

* 被调方法的参数

* @return arg2 被调方法所属的对象实例

*/

public void before(Method arg0, Object[] arg1, Object arg2)

throws Throwable {

// TODO Auto-generated method stub

SimpleDateFormat formate = new SimpleDateFormat("yyyy-MM-dd");

String currentDate = formate.format(new Date());

System.out.println("*****************" + currentDate + " 执行方法 "

+ arg0.getName() + " 参数为： " + Arrays.toString(arg1));

}

 

}

 

LogAroundAdvice.java

package com.chapter8.advices;

import org.aopalliance.intercept.MethodInterceptor;

import org.aopalliance.intercept.MethodInvocation;

/**

* 环绕通知

* @author Administrator

*

*/

public class LogAroundAdvice implements MethodInterceptor {

/**

* 实现接口中的方法

*

* @param method

* 获取一个代理对象，该对象可以调用目标方法。

*/

public Object invoke(MethodInvocation method) throws Throwable {

// TODO Auto-generated method stub

System.out.println("........ aroundAdvice 方法执行之前 ");

Object result = method.proceed();

System.out.println("result = " + result);

System.out.println("........ aroundAdvice 方法执行之后 ");

return result;

}

}

 

测试以上代码：

TestAdvice.java

package com.chapter8.advices;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**

*

* @author Administrator

* 在本例测试中 BookService 接口中的 buy 和 comment 方法都需要完成日志操作，

* 在系统的其他地方也可能需要日志处理，那么在这里日志已经散落在系统的不同部

* 分了，为了解决系统中所有的日志输出问题，可以把日志输出集中解决。

*

*/

public class TestAdvice {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

ApplicationContext context = new ClassPathXmlApplicationContext (

"advices.xml" );

BookService bookService = (BookService) context.getBean( "bookService" );

bookService.buy( "scott" , "Java" , 100.5);

bookService.comment( "scott" , " 很不错的一本书 " );

bookService.bookOrder();

bookService.bookCustomer();

}

}

advices.xml 代码如下：

<? 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:aop = "http://www.springframework.org/schema/aop"

xsi:schemaLocation = "http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-2.0.xsd

http://www.springframework.org/schema/aop

http://www.springframework.org/schema/aop/spring-aop-2.0.xsd" >

 

<!-- 完成织入操作， spring 使用代理的方式将方面代码织入到业务对象中 -->

< bean id = "bookService"

class = "org.springframework.aop.framework.ProxyFactoryBean" >

< property name = "proxyInterfaces" >

< value > com.chapter8.advices.BookService </ value >

</ property >

< property name = "interceptorNames" >

< list >

< value > logAdvice </ value >

<!-- 设置通知类型 -->

<!-- 设置后置通知 -->

<!--<value>logAfterAdvice</value>-->

<!-- 设置前置通知 -->

<!--<value>logbeforAdvice</value>-->

<!-- 设置环绕通知 -->

<!--<value>logAroundAdvice</value>-->

</ list >

</ property >

< property name = "target" ref = "bookServiceTarget" ></ property >

</ bean >

 

<!-- 切入点 -->

< bean id = "logAdvice"

class = "org.springframework.aop.support.NameMatchMethodPointcutAdvisor" >

< property name = "mappedNames" >

< list >

<!-- 匹配连接点的规则。通知和一个切入点表达式关联，并在满足这个切入点的连接点上运行 -->

<!-- 指定在 buy 方法上执行通知 -->

< value > buy </ value >

<!-- 指定在所有 book 开始的方法上执行通知 -->

< value > book* </ value >

</ list >

</ property >

< property name = "advice" ref = "logAroundAdvice" ></ property >

</ bean >

 

< bean id = "logbeforAdvice"

class = "com.chapter8.advices.LogBeforeAdvice" >

</ bean >

< bean id = "logAfterAdvice"

class = "com.chapter8.advices.LogAfterAdvice" >

</ bean >

< bean id = "logAroundAdvice"

class = "com.chapter8.advices.LogAroundAdvice" >

</ bean >

 

< bean id = "bookServiceTarget"

class = "com.chapter8.advices.BookServiceImpl" >

</ bean >

 

 

</ beans >