Spring AOP 之 NameMatchDemo-优快云博客

本文介绍如何使用Spring AOP中的NameMatchMethodPointcutAdvisor来为目标方法添加前置通知。通过示例代码展示了如何配置并应用Advice到特定命名模式的方法上。

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平台：Spring2.5

Pointcut定义了Jointpoint，在Sprint中使用PointcutAdvisor来提供Pointcut、结合Advice，PointcutAdvisor为Advisor的子接口，Advisor接口定义如下：

package org.springframework.aop;

import org.aopalliance.aop.Advice;

public interface Advisor{

boolean isPerInstance();

Advice getAdvice();

}

PointcutAdvisor接口在Spring中定义如下：

package org.springframework.aop;

public interface PointcutAdvisor extends Advisor{

Pointcut getPointcut();

}

Spring中内建的Pointcut都有对应的PointcutAdvisor，在这里先来介绍一下，如何使用Spring所提供的org.springframework.aop.support.NameMatchMethodPointcutAdvisor，这是最基本的PointcutAdvisor，用以提供Spring中静态的Pointcut实例，可使用表示式(expression)指定Advice应用目标上的方法名称，或者是用 * 来指定，例如当 hello* 表示执行代理对象上以hello作为开头的方法名称时，它都会应用指定的Advices(在这个主题之前的例子，Advice会被应用至所有代理的方法)。

IHello.java内容：

package onlyfun.caterpillar;

public interface IHello {
public void helloNewbie(String name);
public void helloMaster(String name);
}

HelloSpeaker.java内容:

package onlyfun.caterpillar;

public class HelloSpeaker implements IHello {
    public void helloNewbie(String name) {
        System.out.println("Hello, " + name + " newbie!");
    }

    public void helloMaster(String name) {
        System.out.println("Hello, " + name + " master!");
    }
}

LogBeforeAdvice.java内容：

package onlyfun.caterpillar;

import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.springframework.aop.MethodBeforeAdvice;

public class LogBeforeAdvice
        implements MethodBeforeAdvice {
    private Logger logger =
            Logger.getLogger(this.getClass().getName());

    public void before(Method method, Object[] args,
                     Object target) throws Throwable {
        logger.log(Level.INFO,
                "method starts..." + method);
   }
}

applicationContext.xml内容：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

    <bean id="logBeforeAdvice"
          class="onlyfun.caterpillar.LogBeforeAdvice"/>

    <bean id="helloAdvisor"
          class="org.springframework.aop.support.NameMatchMethodPointcutAdvisor">
       <property name="mappedName" value="*Newbie"/>
       <property name="advice" ref="logBeforeAdvice"/>
    </bean>

    <bean id="helloSpeaker"
          class="onlyfun.caterpillar.HelloSpeaker"/>

    <bean id="helloProxy"
          class="org.springframework.aop.framework.ProxyFactoryBean">
        <property name="proxyInterfaces"
                  value="onlyfun.caterpillar.IHello"/>
        <property name="target" ref="helloSpeaker"/>
        <property name="interceptorNames">
            <list>
                <value>helloAdvisor</value>
            </list>
        </property>
    </bean>

</beans>

test.java内容：

package onlyfun.caterpillar;

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

public class test{
    public static void main(String[] args) {
        ApplicationContext context =
                new ClassPathXmlApplicationContext(
                        "beans-config.xml");

        IHello helloProxy =
            (IHello) context.getBean("helloProxy");

        helloProxy.helloNewbie("Justin");
        helloProxy.helloMaster("caterpillar");
    }
}

log4j.properties

log4j.rootLogger=WARN, stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n