Java定时缓存数据

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package com.zwb.test.timeCache;

import java.util.HashMap;
import java.util.Timer;
import java.util.TimerTask;

public class Test
{
   /**
   * key:phone_num手机号，value:message手机短信验证码
   */
   private HashMap<String, String> messageMap = new HashMap<String, String>();

   /**
   * 定时缓存
   * @param phoneNum
   * @param message
   */
   private void timerCache(String phoneNum, String message)
   {
       messageMap.put(phoneNum, message);
       Timer timer = new Timer();
       //60秒后执行任务TimerDeleteTask
       timer.schedule(new TimerDeleteTask(phoneNum, timer), 60000);
   }

   /**
   * 定义一个任务，60秒后删除map中对应的key-value值
   * @author zhengwb
   *
   */
   class TimerDeleteTask extends TimerTask
   {
       private String phoneNum;

       private Timer timer;

       public TimerDeleteTask(String phoneNum, Timer timer)
       {
           this.phoneNum = phoneNum;
           this.timer = timer;
       }

       @Override
       public void run()
       {
           messageMap.remove(phoneNum);
           timer.cancel();
           if (null != timer)
           {
               timer = null;
           }
       }

   }

   /**
   * @param args
   */
   public static void main(String[] args)
   {
       Test test = new Test();
       String phoneNum = "13111111111";
       String message = "123456";
       test.timerCache(phoneNum, message);
       System.out.println(test.messageMap.get(phoneNum));
       try
       {
           //延时30秒
           Thread.currentThread().sleep(30000);
           System.out.println("30秒后...");
           if (test.messageMap.containsKey(phoneNum))
           {
               System.out.println(test.messageMap.get(phoneNum));
           }
           //延时40秒
           Thread.currentThread().sleep(40000);
           System.out.println("40秒后...");
           if (!test.messageMap.containsKey(phoneNum))
           {
               System.out.println("data delete success");
           }

       }
       catch (InterruptedException e)
       {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
   }

}

执行结果：

123456
30秒后...
123456
40秒后...
data delete success