前幾天看到網友總結的自學經驗,覺得說得很好,引文:光看別人騎自行車很輕易, 那麼是不是看了幾百遍別人怎麼騎自行車你也就馬上能騎著走了呢? 不摔跤是不可能學會的。
還有就是要經常總結:剛才說到會摔跤, 那麼這時候就要總結碰到的問題, 這樣下次再碰到就不會再去回憶了. 好記性不如爛筆頭. 注釋, 假如今天不寫, 那麼以後只會越來越忙, 以後再也沒時間寫注釋了. If you doesn't have time to do it today, then when do you have time to do it tomorrow?
所以今天就寫個Spring的消息和事件實例。
1、JavaBean:User.java
package cn.xy.hw;
/** *//**
* @author hanwei
*
*/
public class User ...{
private String name;
private int age;
public int getAge() ...{
return age;
}
public void setAge(int age) ...{
this.age = age;
}
public String getName() ...{
return name;
}
public void setName(String name) ...{
this.name = name;
}
}
2、用於國際化的兩個消息資源文件:xiyou_en_US.properties和xiyou_zh_CN.properties
userlogin user ...{0} login at ...{1}
和
userlogin 使用者 ...{0} 於 ...{1}登入
自定義下雨的事件:RainEvent.java
package cn.xy.hw;
import org.springframework.context.ApplicationEvent;
/** *//**
* @author hanwei
*
*/
public class RainEvent extends ApplicationEvent ...{
public RainEvent(Object arg0) ...{
super(arg0);
System.out.println("烏雲密布、閃電、打雷,緊接著,下起了瓢潑大雨。");
}
}
下雨事件監聽器:RainListener.java
package cn.xy.hw;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
/** *//**
* @author hanwei
*
*/
public class RainListener implements ApplicationListener ...{
/**//* (non-Javadoc)
* @see org.springframework.context.ApplicationListener#onApplicationEvent(
org.springframework.context.ApplicationEvent)
*/
public void onApplicationEvent(ApplicationEvent arg0) ...{
if(arg0 instanceof RainEvent)...{
System.out.println("唐僧大喊:"+arg0.getSource()+"趕緊收衣服喽!");
}
}
}
配置文件:applicationContext.XML
<!--sp-->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-2.0.xsd">
<bean id="user" class="cn.xy.hw.User" abstract="false"
lazy-init="default" autowire="default" dependency-check="default">
<property name="name">
<value>hanweivalue>
property>
<property name="age">
<value>20value>
property>
bean>
<bean id="messageSource"
class="org.springframework.context.support.ResourceBundleMessageSource"
abstract="false" lazy-init="default" autowire="default"
dependency-check="default">
<property name="basename" value="xiyou">property>
bean>
<bean id="listener" class="cn.xy.hw.RainListener" abstract="false"
lazy-init="default" autowire="default" dependency-check="default">
bean>
beans>
測試類:MianTest.java
package cn.xy.hw;
import java.util.Calendar;
import java.util.Locale;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/** *//**
* @author hanwei
*
*/
public class MianTest ...{
public static void main(String[] args) ...{
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
User user = (User)context.getBean("user");
Object[] obj=new Object[]...{user.getName(),Calendar.getInstance().getTime()};
System.out.println(context.getMessage("userlogin",obj
,"找不到指定模塊!",Locale.CHINA));
System.out.println(context.getMessage("userlogin",obj
,"找不到指定模塊!",Locale.US));
context.publishEvent(new RainEvent("下雨了!"));
}
}
OK了,這是運行測試類的結果:
使用者 hanwei 於 07-8-26 下午6:14登入
user hanwei login at 8/26/07 6:14 PM
烏雲密布、閃電、打雷,緊接著,下起了瓢潑大雨。
唐僧大喊:下雨了!趕緊收衣服喽!
log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.