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How to refresh a JSP page at regular interval?

Following example would use setIntHeader() method to set Refresh header to simulate a digital clock −

<%@ page import = "java.io.*,java.util.*" %>

<html>
   <head>
      <title>Auto Refresh Header Example</title>
   </head>
   <body>
      <center>
         <h2>Auto Refresh Header Example</h2>
         <%
            // Set refresh, autoload time as 5 seconds
            response.setIntHeader("Refresh", 5);
            // Get current time
            Calendar calendar = new GregorianCalendar();
            String am_pm;
            int hour = calendar.get(Calendar.HOUR);
            int minute = calendar.get(Calendar.MINUTE);
            int second = calendar.get(Calendar.SECOND);
            if(calendar.get(Calendar.AM_PM) == 0)
               am_pm = "AM";
            else
               am_pm = "PM";
            String CT = hour+":"+ minute +":"+ second +" "+ am_pm;
            out.println("Current Time is: " + CT + "
");
         %>
      </center>
   </body>
</html>

Now put the above code in main.jsp and try to access it. This will display the current system time after every 5 seconds as follows. Run the JSP. You will receive the following output: −

Auto Refresh Header Example

Current Time is: 9:44:50 PM
Updated on 30-Jul-2019 22:30:25

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