spring定时器

package edu.xjtu.sei.timer;

import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.TimerTask;


import edu.xjtu.sei.skyeye.state.dao.BotWallDAO;
import edu.xjtu.sei.skyeye.state.po.BotWall;


public class BotWallTimer extends TimerTask {

	private BotWallDAO botWallDAO;
	
	public void setBotWallDAO(BotWallDAO botWallDAO) {
		this.botWallDAO = botWallDAO;
	}
	
	@Override
	public void run() {
		List<BotWall> list=botWallDAO.findAll();
		for (int i = 0; i < list.size(); i++) {
			BotWall bw=list.get(i);
			String ip=bw.getIp();
			String  urlStr = "http://"+ip+":9066";
			boolean resule=exists(urlStr);	
			if(resule){
				botWallDAO.timerMassage(ip, 1);
			}else {
				botWallDAO.timerMassage(ip, 0);
				
			}
		}
	}
	 static boolean exists(String URLName) {

	       try {
	           //设置此类是否应该自动执行 HTTP 重定向（响应代码为 3xx 的请求）。
	           HttpURLConnection.setFollowRedirects(false);
	           //到 URL 所引用的远程对象的连接
	           HttpURLConnection con = (HttpURLConnection) new URL(URLName)

	                  .openConnection();
	           /* 设置 URL 请求的方法， GET POST HEAD OPTIONS PUT DELETE TRACE 以上方法之一是合法的，具体取决于协议的限制。*/
	           con.setRequestMethod("HEAD");
	           //从 HTTP 响应消息获取状态码
	           return (con.getResponseCode() == HttpURLConnection.HTTP_OK);
	       } catch (Exception e) {

	           return false;

	        }

	    }
}

一直通过http请求看连接是否有效。

<bean id="infoCenterAutoBuildTask"  
        class="edu.xjtu.sei.skyeye.state.timer.BotWallTimer">  
        <property name="botWallDAO" ref="botWallDAO" />  
    </bean>  
    <bean id="scheduledTask"  
        class="org.springframework.scheduling.timer.ScheduledTimerTask">  
        <property name="delay" value="10000" />  
        <property name="period" value="1800000" />    
        <property name="timerTask" ref="infoCenterAutoBuildTask" />  
    </bean> 

spring配置