这几天因为需要测试mongodb读写分离的问题，因此写了个定时查询程序，并且用到了多线程，以达到定时启动多个线程查询数据库的效果，下边代码记录备忘：

package timmer;import java.util.Timer;import java.util.TimerTask;import mongoService.mongoServiceImp.AlarmServiceImpl;import com.mongodb.DBObject;public class StartTim {  // 从这里开始测试定时查询  public static void main(String[] args) {    Timer timer1 = new Timer();    // 在1秒后执行此任务,每次间隔5秒执行一次,    timer1.schedule(new MyTask(), 1000, 5000);  }  // java定时器要继承timerTask类  static class MyTask extends TimerTask {    AlarmServiceImpl alarmService = new AlarmServiceImpl();    // 调用定时器需要处理的业务    public void run() {      for (int i = 0; i < 3; i++) {        new Thread(new MyThread(alarmService)).start();      }    }  }  static class MyThread implements Runnable {    AlarmServiceImpl alarmService;    public MyThread(AlarmServiceImpl alarmService) {      super();      this.alarmService = alarmService;    }    public void run() {      System.out.println(Thread.currentThread().getName());      test();    }    public void test() {      System.out.println("定时器");      DBObject list = alarmService.findAlarm();      System.out.println(list);    }  }}