Spring 的监听事件 ApplicationListener 和 ApplicationEvent 用法

参照：https://blog.csdn.net/ilovejava_2010/article/details/7953419

一。写一个事件类继承ApplicationEvent

　　

public class FdataEvent extends ApplicationEvent {

    /**
     * 
     */
    private static final long serialVersionUID = 7554563854171912686L;
    
    private Integer fid ;
    private Long time ;
    private Map<String,Object> datas;
    
    public FdataEvent(Object source,Integer fid,Long time,Map<String,Object> datas) {
        super(source);
        this.fid = fid;
        this.time = time;
        this.datas = datas;
    }

    public Integer getFid() {
        return fid;
    }

    public void setFid(Integer fid) {
        this.fid = fid;
    }

    public Long getTime() {
        return time;
    }

    public void setTime(Long time) {
        this.time = time;
    }

    public Map<String, Object> getDatas() {
        return datas;
    }

    public void setDatas(Map<String, Object> datas) {
        this.datas = datas;
    }

}

二。写一个监听类实现ApplicationListener中的onApplicationEvent方法

@Component
public class FdataEventListener implements ApplicationListener<FdataEvent> {

    @Override
    public void onApplicationEvent(FdataEvent event) {
        //写业务逻辑

    }

}

三。获取Spring引用上下环境ApplicationContext，通过ApplicationContext调用publishEvent方法

　　1.通过main方法实现

　　

public class Test {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
        

        FdataEvent event = new FdataEvent(this, fid, timeStamp, param);
        context.publishEvent(event);
       
    }

　　2.在service层中调用SpringContextUtil中的publishEvent方法。

　　

public class SpringContextUtil implements ApplicationContextAware {
    
    // Spring应用上下文环境  
    private static ApplicationContext applicationContext;  
     
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) {  
        SpringContextUtil.applicationContext = applicationContext;  
    }  
     
    public static ApplicationContext getApplicationContext() {  
        return applicationContext;  
    }  
    /** 
     * 获取spring管理的bean
     *  
     * @param name 
     * @return T
     * @throws BeansException 
     */  
    @SuppressWarnings("unchecked")
    public static <T> T getBean(Class<T> clazz,String name) throws BeansException {  
        return (T)applicationContext.getBean(name);  
    }
    /**
     * 获取spring管理的bean
     * @param clazz
     * @return
     */
    public static <T> T getBean(Class<T> clazz) {
        String name = StringUtils.uncapitalize(clazz.getSimpleName());
        return getBean(clazz,name);
    }
    /**
     * 发布事件
     * @param event
     */
    public static void publishEvent(ApplicationEvent event) {
        applicationContext.publishEvent(event);
    }
    

}