用refresh控制浏览器定时刷新

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package cn.itcast.mage;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/*用refresh控制浏览器定时刷新*/
public class ResponseDemo5 extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException
{


  response.setHeader("Refresh", "3");

  String format = "yyyy年MM月dd天 a hh时mm分ss秒";
  SimpleDateFormat simpleDate = new SimpleDateFormat(format);

  String date = simpleDate.format(new Date());

  response.getWriter().write(date);
}

}

index.jsp: