browserinsult.java

来自「servletjsp一些应用程序」· Java 代码 · 共 49 行

JAVA

49 行

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/.
 *  &copy; 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>");
  }
}

browserinsult.java - 源码说明

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