????? 最近在研究Spring? 感覺不錯。。。。。???

????? ApplicationContext中的事件處理是通過ApplicationEvent類和ApplicationListener接口來提供的。如果在上下文中部署一個實現了ApplicationListener接口的bean，那么每當一個ApplicationEvent發布到ApplicationContext時，這個bean就得到通知。

????? 以下是一個關于Spring事件的代碼。

---

package com.xinnuo.spring.event;

/**
?* email 對象
?* @author 周行
?*
?*/
public class Email {
?private String name;
?private String email;
?private String subject;?
?public String getEmail() {
??return email;
?}
?public void setEmail(String email) {
??this.email = email;
?}

?public String getName() {
??return name;
?}
?public void setName(String name) {
??this.name = name;
?}
?public String getSubject() {
??return subject;
?}
?public void setSubject(String subject) {
??this.subject = subject;
?}

}

---

package com.xinnuo.spring.event;

import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;

/**
?* 事件監聽器
?*
?* @author 周行
?*
?*/
public class BlackListNotifier implements ApplicationListener {
?public void onApplicationEvent(ApplicationEvent event) {
??if (event instanceof BlackListEvent) {
???Email email = (Email)event.getSource();
???System.out.println("name:"+email.getName());
???System.out.println("email:"+email.getEmail());
???System.out.println("subject:"+email.getSubject());
??}
?}
}

---

package com.xinnuo.spring.event;

import org.springframework.context.ApplicationEvent;

/**
?* 事件
?*
?* @author 周行
?*
?*/
public class BlackListEvent extends ApplicationEvent{
?private static final long serialVersionUID = 5866734089078382009L;

?public BlackListEvent(Object source) {
??super(source);
?}
}

---

package com.xinnuo.spring.event;

import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
?* @author 周行
?*
?*/
public class EmailBean implements ApplicationContextAware {

??? private List blackList;
??? private ApplicationContext ctx;
??? private Email email;
??? public void setEmail(Email email) {
??this.email = email;
?}

?public void setBlackList(List blackList) {
??????? this.blackList = blackList;
??? }
???
??? public void setApplicationContext(ApplicationContext ctx) {
??????? this.ctx = ctx;
??? }
??? public void sendEmail(String address) {
??????? if (blackList.contains(address)) {
??????????? BlackListEvent evt = new BlackListEvent(email);
??????????? //發布事件
??????????? ctx.publishEvent(evt);
??????????? return;
??????? }
??? }
}

---

package com.xinnuo.spring.event;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

/**
?* Spring 事件測試
?* @author 周行
?*
?*/
public class Demo {
?public static void main(String[] args) {
??ApplicationContext context = new FileSystemXmlApplicationContext("applicationContext.xml");
??EmailBean EmailBean = (EmailBean)context.getBean("emailer");
??EmailBean.sendEmail(black@list.org);
?}
}

---

applicationContext.xml

<beans>
?<bean id="emailer" class="com.xinnuo.spring.event.EmailBean" abstract="false" singleton="true" lazy-init="default" autowire="default" dependency-check="default">
??<property name="blackList">
???<list>
????<value>black@list.org</value>
????<value>white@list.org</value>
????<value>john@doe.org</value>
???</list>
??</property>
??<property name="email">
???<ref bean="email" />
??</property>
?</bean>

?<bean id="blackListListener" class="com.xinnuo.spring.event.BlackListNotifier"></bean>

?<bean id="email" class="com.xinnuo.spring.event.Email" abstract="false" singleton="true" lazy-init="default" autowire="default" dependency-check="default">
??<property name="name">
???<value>zhouxing</value>
??</property>
??<property name="email">
???<value>zx_zhouxing@sina.com</value>
??</property>
??<property name="subject">
???<value>你好，歡迎光臨！</value>
??</property>
?</bean>
</beans>

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