spring 的使用

相比前两大框架，spring的使用就简单的多，导入spring相关依赖包后，在javase中可以通过以下代码获得

ApplicationContext appl = new ClassPathXmlApplicationContext("bean.xml");
        System.out.printf(appl+"\n");
        News new2=(News) appl.getBean("news");//通过使用getBean获取代理对象的代理类

        //spring根据配置文件信息，负责创建News类，并且为News的相关属性赋值-这种由spring为对象赋值的叫做

        //控制反转即（Inversion of control ioc）

        System.out.printf(new2.getContent()+"\n");

对应的bean配置文件如下

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns=""
       xmlns:xsi=""
       xmlns:aop=""
       xmlns:tx=""
       xmlns:context=""
       xsi:schemaLocation="
                           /spring-beans-2.5.xsd

                           /spring-aop-2.5.xsd

                           /spring-context-2.5.xsd

                           /spring-tx-2.5.xsd">
   <bean id="news" class="model.News">
           <property name="content" value="12312"></property>
   </bean>
   <bean id="emailListener" class="model.EmailListener">

   </bean>
    <!-- <import resource="applicationContext-db.xml"/>
       <import resource="applicationContext-person.xml"/> -->
</beans>

spring对外提供了很多接口，并且以观察者的模式进行监听。首先时间发生源要继承ApplicationEvent对象，然后事件监听器要实现ApplicationListener，在应用的时候只要调用ApplicationContext.pushEvent();就可以触发事件的相应。以下是源代码

package model;

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

public class EmailListener implements ApplicationListener {

    @Override
    public void onApplicationEvent(ApplicationEvent applicationevent) {
        // TODO Auto-generated method stub

        if(applicationevent instanceof EmailEvent){
            EmailEvent evt =(EmailEvent)applicationevent;
            System.out.printf("需要发邮件的接收地址："+evt.getName());

        }else{

            System.out.printf("容器内部的事件");
        }

    }

}

package model;

import org.springframework.context.ApplicationEvent;

public class EmailEvent extends ApplicationEvent {
    private String name;
    private String address;
    /**
     * application 中的事件机制是以观察者模式运行的，首先实现
     *继承ApplicationEvent中
     * @param source
     */
    public EmailEvent(Object source) {
        super(source);
        // TODO Auto-generated constructor stub

    }
    public EmailEvent(Object source,String name,String address){
        super(source);
        this.name=name;
        this.address=address;

    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }

}

触发代码

EmailEvent evet = new EmailEvent("123","12313","123123");
        appl.publishEvent(evet);