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());
@Override
public 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/aop http://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...