系统启动时队列自动下单--ServletContextListener

package com.liying.pear.queue;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.log4j.Logger;

import com.liying.monkey.core.util.BeanFactory;
import com.liying.pear.web.order.service.OrderService;

/**
 * 进程监听器
 * 
 * @author jqlin
 *
 */
public class ProcessingListener implements ServletContextListener {
    private static final Logger logger = Logger.getLogger(ProcessingListener.class);
    
    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {
        final OrderService ticketService = BeanFactory.getBean(OrderService.class);
        if(ticketService == null) {
            logger.warn("没有匹配的下单服务：" + OrderService.class.getName());
            return;
        }
        
         new Thread(new Runnable() {
             @Override
             public void run() {
                 ticketService.initSendOrder();
             }
         }).start();
    }

    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {

    }
}

布署 ServletContextListener
你实现(implements)了 ServletContextListener 编译后，把它放在正确的WEB-INF/classes目录下，更改WEB-INF目录下的 web.xml文件，在web-app节点里添加：

    <listener>
        <listener-class>com.liying.pear.queue.ProcessingListener</listener-class>
    </listener>