基于代理类ProxyBean的AOP的实现

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一、编写通知类

前置通知：

package com.springtest.advice;import java.lang.reflect.Method;import org.apache.log4j.Logger;import org.springframework.aop.MethodBeforeAdvice;public class BeforeLogAdvice implements MethodBeforeAdvice {private Logger logger = Logger.getLogger(BeforeLogAdvice.class);@Overridepublic void before(Method method, Object[] arg1, Object target) throws Throwable {String className = target.getClass().getName();String methodName = method.getName();String logToText = "这是"+className+"类的"+methodName+"方法的置前通知";logger.info(logToText);}}

后置通知：

package com.springtest.advice;import java.lang.reflect.Method;import org.apache.log4j.Logger;import org.springframework.aop.AfterReturningAdvice;public class LogAdvice implements AfterReturningAdvice {private Logger logger = Logger.getLogger(LogAdvice.class);@Overridepublic void afterReturning(Object object, Method method, Object[] args, Object target) throws Throwable {String className = target.getClass().getName();String methodName = method.getName();String logToText = "这是"+className+"类的"+methodName+"方法的置后通知";logger.info(logToText);}}

环绕通知：

package com.springtest.advice;import org.aopalliance.intercept.MethodInterceptor;import org.aopalliance.intercept.MethodInvocation;import org.apache.log4j.Logger;public class AroundAdvice implements MethodInterceptor {private Logger logger = Logger.getLogger(AroundAdvice.class);@Overridepublic Object invoke(MethodInvocation methodInvocation) throws Throwable {long beginTime = System.currentTimeMillis();methodInvocation.proceed();long endTime = System.currentTimeMillis();String targetMethodName = methodInvocation.getMethod().getName();String logInfoText = "环绕通知:"+targetMethodName+"方法调用前时间"+beginTime+"毫秒，调用后时间"+endTime+"毫秒";logger.info(logInfoText);return null;}}

二、编写applocationContext

<?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.xsd">    <bean id="print" class="com.springtest.dao.Print"></bean><bean id="userDao" class="com.springtest.dao.UserDaoImpl"></bean><bean id="userBiz" class="com.springtest.dao.UserBizImpl"><property name="userDao" ref="userDao"></property></bean><bean id="logAdvice" class="com.springtest.advice.LogAdvice"></bean><bean id="beforeLogAdvice" class="com.springtest.advice.BeforeLogAdvice"></bean><bean id="aroundAdvice" class="com.springtest.advice.AroundAdvice"></bean><bean id="ub" class="org.springframework.aop.framework.ProxyFactoryBean"><property name="proxyInterfaces"><list><value>com.springtest.dao.UserBiz</value></list></property><property name="interceptorNames"><list><value>logAdvice</value><value>beforeLogAdvice</value><value>aroundAdvice</value></list></property><property name="target" ref="userBiz" /></bean></beans>

三、编写 UserDao和UserDaoImpl

package com.springtest.dao;public interface UserDao {public void addUser();}

package com.springtest.dao;public class UserDaoImpl implements UserDao {@Overridepublic void addUser() {System.out.println("增加用户！!!");}}

四、编写UserBiz和UserBizImpl

package com.springtest.dao;public interface UserBiz {public void addUser();}

package com.springtest.dao;public class UserBizImpl implements UserBiz {private UserDao userDao;@Overridepublic void addUser() {this.userDao.addUser();}public void setUserDao(UserDao userDao) {this.userDao = userDao;}}

五、编写测试类

package com.springtest;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.springtest.dao.UserBiz;public class TestAop {public static void main(String[] args) {ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");UserBiz userBiz = (UserBiz) applicationContext.getBean("ub");userBiz.addUser();}}

输出结果：

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