How to check whether which Web-Browser have been used to run JSP and Servlets ?.

A simple Web Application demonstrating how to check whether which Web-Browser have been used to run JSP and Servlets

Using Java Server Pages : browser.jsp

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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Browser Test</title>
</head>
<body>

 <h2>
  Let's have a browser test today : <br> The Web-Browser you are
  using today is :

 </h2>

 <hr>

 <%
  // JSP page has request implicit object has a method which brings
  // with it headers coming in request. The method name is
  // request.getHeader(). In order to check which browser 
  // we are using we extract user-agent info from the headers
  String browser = request.getHeader("user-agent");
  if (browser.indexOf("MSIE") != -1) {
 %>
 <h2>You are using Microsoft Internet Explorer today</h2>
 <%
  }
  else if (browser.indexOf("Chrome") != -1) {
 %>
 <h2>You are using Google Chrome today</h2>
 <%
  }
  else if (browser.indexOf("Firefox") != -1) {
 %>
 <h2>You are using Mozilla Firefox today</h2>
 <%
  }
  else {
 %>
 <h2>You are using any other browser</h2>
 <%
  }
 %>
 <hr>
</body>
</html>

Using Servlets : BrowserTestServlet.java

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/BrowserTestServlet")
public class BrowserTestServlet extends HttpServlet {

 protected void doGet(HttpServletRequest request,
   HttpServletResponse response)
     throws
     ServletException, IOException {

  String browser = request.getHeader("user-agent");

  PrintWriter out = response.getWriter();
  out.println("<br/><h2>Let's have a browser test today : " 
    + "<br> The Web-Browser you are using today is : ");
  out.println("<br/></hr>");



  out.println("<br/>");
  if(browser.indexOf("MSIE")!=-1)
   out.println("<h2>You are using Microsoft Internet Explorer</h2>");
  else if(browser.indexOf("Chrome")!=-1)
   out.println("<h2>You are using Google Chrome</h2>");
  else if(browser.indexOf("Firefox")!=-1)
   out.println("<h2>You are using Mozilla Firefox</h2>");
  else
   out.println("<h2>You are using any other browser</h2>");
 }

}

Output of the Servlet and JSP are same as below:

In a Microsoft Explorer Window output is :