spring用过,但是没有系统的学习过,最近工作不是很忙,所以找了本书(SPRING实战)学习下,然后在这里也算做个笔记吧。
一直都知道spring有两大宝:IOC和AOP。AOP在曾经做的项目中没有用到,所以一直不甚明白。这次机会让我可以一点点打开其神秘面纱
下面开始介绍我的小程序了:
定义Performer接口:
package com.study.spring.aop;
public interface Performer {
public void perform();
}
定义一个Performer的实现类Juggler:
package com.study.spring.aop;
public class Juggler implements Performer {
private int bagBeans = 3;
public Juggler() {}
public Juggler(int bagBeans) {
this.bagBeans = bagBeans;
}
public void perform() {
System.out.println("perform" + bagBeans);
}
}
定义切面类
package com.study.spring.aop;
public class Audience {
public void takeSeats() {
System.out.println("The audience is taking their seats");
}
public void turnOffCellphones() {
System.out.println("The audience is turning off their cellphones");
}
public void applaud() {
System.out.println("CLAP CLAP CLAP CLAP CLAP CLAP ");
}
public void demandRefund() {
System.out.println("Boo! We want our money back");
}
}
spring配置文件
<?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-4.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.1.xsd"
xmlns:aop="http://www.springframework.org/schema/aop">
<bean id="juggler" class="com.study.spring.aop.Juggler">
<constructor-arg value="15" />
</bean>
<bean id="audience" class="com.study.spring.aop.Audience" />
<aop:config>
<aop:aspect ref="audience">
<aop:pointcut id="performance"
expression="execution(* com.study.spring.aop.Performer.perform(..))" />
<aop:before pointcut-ref="performance" method="takeSeats" />
<aop:before pointcut-ref="performance" method="turnOffCellphones" />
<aop:after-returning pointcut-ref="performance"
method="applaud" />
<aop:after-throwing pointcut-ref="performance"
method="demandRefund" />
</aop:aspect>
</aop:config>
</beans>
定义测试类:
package com.study.spring;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.study.spring.aop.Performer;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext ctx = null;
ctx = new ClassPathXmlApplicationContext("com/study/spring/spring.xml");
Performer performer = (Performer) ctx.getBean("juggler");
performer.perform();
}
}
执行结果:
The audience is taking their seats
The audience is turning off their cellphones
perform15
CLAP CLAP CLAP CLAP CLAP CLAP