Spring AOP（一、xml文件配置实现）

在Xml配置AOP有两种实现方式：一、基于代理实现AOP切面编程；二、通过自动代理实现AOP切面编程

项目结构

其中，StudentsDAOImpl.java为切面类

一、基于代理实现AOP切面编程

StudentsDAOImpl.java

package com.pro.proxy;

import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;
import org.springframework.aop.MethodBeforeAdvice;

public class StudentsDAOProxy implements MethodBeforeAdvice,AfterReturningAdvice{

@Override
public void afterReturning(Object returnValue, Method method,
Object[] args, Object target) throws Throwable {
// TODO Auto-generated method stub
System.out.println("执行方法之后");
}

@Override
public void before(Method method, Object[] args, Object target)
throws Throwable {
// TODO Auto-generated method stub
System.out.println("执行方法之前");
}

}

applicationContext.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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd"> 
<!-- 基于代理的AOP实现 -->
<!-- 1.定义实现类bean -->
<bean id="studentsDaoImpl" class="com.pro.vo.StudentsDAOImpl"></bean>

<!-- 2.定义代理类 -->
<bean id="studentsDaoProxy" class="com.pro.proxy.StudentsDAOProxy"></bean>

<!-- 3.定义切入点 -->
<bean id="studentsDaoPointCut" class="org.springframework.aop.support.JdkRegexpMethodPointcut">
<property name="pattern" value=".*Students"/>
</bean>

<!-- 4.定义通知 -->
<bean id="studentsDaoAdvisor" class="org.springframework.aop.support.DefaultPointcutAdvisor">
<property name="advice" ref="studentsDaoProxy"/>
<property name="pointcut" ref="studentsDaoPointCut"/>
</bean>

<!-- 5.定义代理工厂 -->
<bean id="studentsDaoFactory" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="studentsDaoImpl"></property>
<property name="interceptorNames" value="studentsDaoAdvisor"></property>
<property name="proxyInterfaces" value="com.pro.dao.StudentsDAO"></property>
</bean>
</beans>

测试类test.java

package com.pro.test;

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

import com.pro.dao.StudentsDAO;

public class Test {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
StudentsDAO sDao = (StudentsDAO) ctx.getBean("studentsDaoFactory");  //获取代理工厂Bean
sDao.saveStudents();
}

}

二、自动代理的AOP实现

StudentsDAOProxy.java与上面一样

但是 在applicationContext.xml中稍有改动

applcationContext.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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd"> 
<!-- 自动代理的AOP实现 -->
<!-- 1.定义实现类bean -->
<bean id="studentsDaoImpl" class="com.pro.vo.StudentsDAOImpl"></bean>

<!-- 2.定义代理类 -->
<bean id="studentsDaoProxy" class="com.pro.proxy.StudentsDAOProxy"></bean>

<!-- 3.定义支持正则表达式的通知 -->
<bean id="studentsDaoAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
<property name="advice" ref="studentsDaoProxy"/>
<property name="pattern" value=".*Students"></property>
</bean>
<!-- 4.声明支持自动代理 -->
<bean class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator"></bean>

</beans>

测试类test.java

package com.pro.test;

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

import com.pro.dao.StudentsDAO;

public class Test {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
StudentsDAO sDao = (StudentsDAO) ctx.getBean("studentsDaoImpl");//获取实现累的bean
sDao.saveStudents();
}

}

相比较，自动代理实现的AOP会比基于代理实现的AOP会方便很多

源码下载点击打开链接