Spring的AOP简单介绍和常用配置(2)

在1中我简单的介绍了基于AOP标签配置的一种形式，并没有将前，后Advice以及异常Advice等配置罗列出来。

还是重复唠叨一下，基础AOP标签配置的好处和坏处都是什么：

好处：自动代理，不需要自定义代理对象。配置简单。

坏处：不易理解。

下面是实例：

步骤：

1、业务接口定义 

package com.techbirds.spring.aop_two;public interface ICar {public void go() throws Exception;}

2、业务接口实现

package com.techbirds.spring.aop_two;import java.util.logging.Logger;public class Bus implements ICar {private Logger logger=Logger.getLogger(this.getClass().getName());@Overridepublic void go() throws Exception {logger.info("the bus go...");throw new Exception();}}

3、Adivce(插入代码)实现

package com.techbirds.spring.aop_two;import java.util.logging.Level;import java.util.logging.Logger;import org.aspectj.lang.JoinPoint;public class LogAspectCar {private Logger logger=Logger.getLogger(this.getClass().getName());/** * 执行后 * @param jp */public void afterCar(JoinPoint jp){logger.info("do ... after the car "+jp.getSignature().getName());}/** * 执行前 * @param jp */public void beforeCar(JoinPoint jp){logger.info("do ... before the car "+jp.getSignature().getName());}/** * 执行异常信息获取 * @param jp * @param ta */public void throwExceptionOfCar(JoinPoint jp,Throwable ta){logger.log(Level.WARNING,"log "+ta+" " +"Exception was thrown in "+jp.getSignature().getDeclaringTypeName()+"."+jp.getSignature().getName());}}

4、spring对应配置

<?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"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 http://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-3.1.xsd"><bean id="bus" class="com.techbirds.spring.aop_two.Bus"></bean><bean id="logAspectCar" class="com.techbirds.spring.aop_two.LogAspectCar"></bean><aop:config>      <aop:aspect ref="logAspectCar">         <aop:before method="beforeCar" pointcut="execution (* com.techbirds.spring.aop_two.ICar.*(..))"/>        <aop:after-returning method="afterCar" pointcut="execution (* com.techbirds.spring.aop_two.ICar.*(..))" />         <aop:after-throwing method="throwExceptionOfCar" throwing="ta" pointcut="execution (* com.techbirds.spring.aop_two.ICar.*(..))" />     </aop:aspect>  </aop:config> <!-- 这个配置跟上面的目的一样，比较方便一点<aop:config>      <aop:aspect ref="logAspectCar">     <aop:pointcut id="car_pc" expression="execution (* com.techbirds.spring.aop_two.ICar.*(..))" />        <aop:before method="beforeCar" pointcut-ref="car_pc"/>        <aop:after-returning method="afterCar" pointcut-ref="car_pc"/>     </aop:aspect>  </aop:config> --></beans>

5、测试

package com.techbirds.spring.aop_two;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class AopTest {//public Logger logger=Logger.getLogger(this.getClass().getName());public static void main(String[] args) {//ApplicationContext ctx//= new FileSystemXmlApplicationContext("resources/aop.xml");ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:/resources/aop.xml");// 得到代理对象ICar car = (ICar) ctx.getBean("bus");// 执行方法try {car.go();} catch (Exception e) {System.out.println("go error...");}}}

6、测试结果

2013-6-8 16:05:59 com.techbirds.spring.aop_two.LogAspectCar beforeCar
信息: do ... before the car go
2013-6-8 16:05:59 com.techbirds.spring.aop_two.Bus go
信息: the bus go...
2013-6-8 16:05:59 com.techbirds.spring.aop_two.LogAspectCar throwExceptionOfCar
警告: log java.lang.Exception Exception was thrown in com.techbirds.spring.aop_two.ICar.go
go error...