在无限循环中暂停并重新启动线程

Question

我需要的要求如下所示。

• 我有一个jsp包含启用和禁用单选按钮。
• 如果我点击启用，则应该按照每隔2或3小时的时间间隔执行一个进程。

• 如果单击并提交禁用，则为 当前执行任务应暂停，直到再次启用 从jsp中提交/单击（如果启用，则应执行上述步骤 继续执行）。

  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
  {
  
  
      //first time execution
      if(request.getParameter("lic").equals("enable") && counter==0)
      {
          t1.start();
          counter++;
          System.out.println(counter);
      }
  
  
      //if already started and clicks re-enable
      else if(request.getParameter("lic").equals("enable") && counter>0)
      {
          System.out.println("thread already started");
          t1.interrupt();
      }
  
      //for long pausing of thread
      else if(request.getParameter("lic").equals("disable"))
      {
          System.out.println("thread is going to pause");
          try 
          {
              Thread.sleep(20000);
              System.out.println("slept for 20 seconds");
          } 
          catch (InterruptedException e) 
          {
              // TODO Auto-generated catch block
              System.out.println("interrupted while sleeping");
          }
  
      }
  }
  static int counter = 0;
  static Thread t1 = new Thread()
  {
      public void run()
      {
          System.out.println("hi thread is executed");
      }   
  };
  

  }