Servlet Automatically Refreshes The Page

Servlet Auto Refresh Page

Servlets are Java classes which service HTTP requests and implement the javax.servlet.Servlet interface. Web applications deployed on a Java servlet container such as Tomcat, Jetty, or GlassFish use servlets to handle requests and generate responses.

If you want a servlet to generate a page that automatically refreshes, you can use the Refresh HTTP header. The Refresh header contains the number of seconds until the page should be refreshed.

Here is an example of a simple servlet that sends an HTML page which automatically refreshes every 5 seconds:

import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class RefreshServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Set refresh interval (in seconds) response.setIntHeader("Refresh", 5); // Set response content type response.setContentType("text/html"); PrintWriter out = response.getWriter(); String title = "Auto Refresh Header Setting"; String docType = "<!doctype html public \"-//w3c//dtd html 4.0 " + "transitional//en\">\n"; out.println(docType + "<html>\n" + "<head><title>" + title + "</title></head>\n" + "<body bgcolor=\"#f0f0f0\">\n" + "<h1 align=\"center\">" + title + "</h1>\n" + "<p>Current Time is: " + new java.util.Date() + "</p>\n"); } }

In this example, the Refresh header is set with response.setIntHeader("Refresh", 5), which tells the browser to refresh the page every 5 seconds. The rest of the servlet generates a simple HTML page that displays the current time, so you can see the time update every 5 seconds when you load this page in a browser.

This is a very basic example. Real-world servlets often do more complex tasks, like reading data from a database, handling form submissions, managing sessions, and more.

Examples

  1. Refreshing HTML page automatically in Servlet: Use meta-refresh tag in HTML to automatically reload the page.

    <meta http-equiv="refresh" content="5">

  2. Servlet periodic page refresh: Implement periodic page refresh using JavaScript.

    response.setContentType("text/html"); response.getWriter().println("<script>setTimeout(function(){ location.reload(); }, 5000);</script>");

  3. Auto-refreshing a JSP page with Servlet: Include JavaScript for auto-refresh in your JSP.

    response.setContentType("text/html"); response.getWriter().println("<script>setTimeout(function(){ location.reload(); }, 5000);</script>");

  4. Servlet JavaScript auto refresh: Embed JavaScript in your Servlet response for auto-refresh.

    response.setContentType("text/html"); response.getWriter().println("<script>setTimeout(function(){ location.reload(); }, 5000);</script>");

  5. Reloading a Servlet page at regular intervals: Use JavaScript to reload the Servlet page periodically.

    response.setContentType("text/html"); response.getWriter().println("<script>setInterval(function(){ location.reload(); }, 5000);</script>");

  6. Java TimerTask for page auto refresh: Utilize TimerTask in Java for periodic tasks.

    Timer timer = new Timer(); timer.schedule(new TimerTask() { public void run() { // Your auto-refresh logic here } }, 0, 5000);

More Tags

wix clickable objective-c ghostscript tabpage tinymce multiprocessing spark-cassandra-connector spring-ioc iis-10

More Programming Guides

Other Guides

More Programming Examples