📄 browserinsult.java
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package coreservlets;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
/** Servlet that gives browser-specific insult.
* Illustrates how to use the User-Agent
* header to tell browsers apart.
* <P>
* Taken from Core Servlets and JavaServer Pages 2nd Edition
* from Prentice Hall and Sun Microsystems Press,
* http://www.coreservlets.com/.
* © 2003 Marty Hall; may be freely used or adapted.
*/
public class BrowserInsult extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title, message;
// Assume for simplicity that Netscape and IE are
// the only two browsers
String userAgent = request.getHeader("User-Agent");
if ((userAgent != null) &&
(userAgent.indexOf("MSIE") != -1)) {
title = "Microsoft Minion";
message = "Welcome, O spineless slave to the " +
"mighty empire.";
} else {
title = "Hopeless Netscape Rebel";
message = "Enjoy it while you can. " +
"You <I>will</I> be assimilated!";
}
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=\"#FDF5E6\">\n" +
"<H1 ALIGN=CENTER>" + title + "</H1>\n" +
message + "\n" +
"</BODY></HTML>");
}
}
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