Refresh a Web Page Using In Servlet
In this simplified example we develop an application to Refresh
a web Page using Servlet. We create two file timer.html and timer.java.
When a web page ("timer.html") run on browser then it will call
to Servlet ("timer.java") and refresh this web page and print the
current Date and Time after 10 sec on the browser as a output.
Step 1: Create a web page(timer.html) to call a Servlets.
timer.html
<HTML>
<HEAD>
<TITLE>Refresh Servlet Timer</TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<style type="text/css">
A:link {text-decoration: none;
padding: 3px 7px;
margin-right: 3px;
border-bottom: none;
color: #2d2b2b; }
A:visited {text-decoration: underline;
padding: 3px 7px;
margin-right: 3px;
color: #2d2b2b; }
A:active {text-decoration: none}
A:hover {text-decoration: none;
padding: 3px 7px;
margin-right: 3px;
border: 0px;
color: #2d2b2b; }
</style>
</HEAD>
<BODY>
<br><br><br> <br><br><br>
<table width="200px" height="100px" align="center" bgcolor="#BBFFFF" border=0>
<tr>
<td style="text-align:top;" valign="middle" align="center" border=0>
<a href="timer" ><b>Refresh Servlet Timer</b></a>
</td>
</tr>
</BODY>
</HTML>
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Step 2:Create a Servlet (timer.java) which refresh the page after every 10
seconds.
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class timer extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
Date now = new Date(); // The current date/time
out.println("<html>");
out.println("<head><title> Time Check </title></head>");
out.println("<body>");
out.println("<table width='100%' align='center' valign='top'>");
out.println("<tr>");
out.println("<td> ");
out.println("</td>");
out.println("</tr>");
out.println("</tr>");
out.println("<tr>");
out.println("<td valign='top' align='center' valign='top'>");
out.println
("<p style='color:#00000;font-size:20pt'><b>The Time is Refresh After 10 Seconds.</b></p>");
out.println("<td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td> ");
out.println("</td>");
out.println("</tr>");
out.println("</tr>");
out.println("<tr>");
out.println("<td> ");
out.println("</td>");
out.println("</tr>");
out.println("</tr>");
out.println("<tr>");
out.println("<td style='background-color:#C6EFF7;color:blue;' width='50' align='center'>");
out.println("<b>The current time is: " + now + "</b>");
out.println("</td>");
out.println("</tr>");
out.println("<table>");
out.println("</body></html>");
response.setHeader("Refresh", "10");
}
}
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Save the above file into "timer\WEB-INF\classes" directory.
Step 3: Mapping the servlet (timer.java) in to web.xml file:
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<display-name>Welcome to Tomcat</display-name>
<description>
Welcome to Tomcat
</description>
<servlet>
<servlet-name>timer</servlet-name>
<servlet-class>timer</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>timer</servlet-name>
<url-pattern>/timer</url-pattern>
</servlet-mapping>
</web-app>
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Step 4: Now compile the java code using javac command from command prompt.
Step 5: Start tomcat and type http://localhost:8080/timer/timer.html in
the browser and Click on Text Link "Refresh Servlet Timer"
. Your browser should display the Current Time and Refresh after 10 seconds.
Successful Output of the program:
Download the full web application shows here.
Download the application
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