    SimpleFormServlet.java

    /*
     * @(#)SimpleFormServlet.java
     *
     * Copyright (c) 1998-1999 Servertec. All Rights Reserved.
     *
     * This software is the proprietary and confidential property of Servertec.
     * Use only in accordance with the terms of the license agreement.
     *
     * SERVERTEC MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY
     * OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
     * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
     * PURPOSE, OR NON-INFRINGEMENT. SERVERTEC SHALL NOT BE LIABLE FOR ANY
     * DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
     * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
     *
     * THIS NOTICE MUST NOT BE ALTERED NOR REMOVED.
     *
     * CopyrightVersion 1.0
     */

    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.ServletOutputStream;
    import javax.servlet.ServletException;
    import java.io.IOException;

    public class SimpleFormServlet extends HttpServlet
    {
        public void service(HttpServletRequest _request, HttpServletResponse _response) throws ServletException, IOException
        {
            _response.setContentType("text/html");

            ServletOutputStream out = _response.getOutputStream();

            out.println("<html>");
            out.println("<head><title>Simple Entry Form</title></head>");
            out.println("<body>");

            String name = _request.getParameter("name");
            if(name == null)
            {
                String oldvalue = _request.getParameter("oldvalue");
                if(oldvalue == null)
                {
                    oldvalue = "";
                }

                out.println("Please enter your name");
                out.println("<br>");
                out.println("<form action=\"./simpleform.html\" method=\"get\">");
                out.println("<input type=\"text\" name=\"name\" value=\"" + oldvalue + "\">");
                out.println("<br>");
                out.println("<input type=\"submit\" value=\"Submit\">");
                out.println("<input type=\"reset\" value=\"Reset\">");
                out.println("</form>");
            }
            else if(name.length() == 0)
            {
                out.println("<h1>Please enter your name</h1>");
                out.println("<br>");
                out.println("[ <a href=\"./simpleform.html?oldvalue=" + name + "\">try again</a> ]");
            }
            else
            {
                out.println("<h1>Hello " + name + "</h1>");
                out.println("<br>");
                out.println("[ <a href=\"./simpleform.html?oldvalue=" + name + "\">try again</a> ]");
            }

            out.println("</body>");
            out.println("</html>");
            out.close();
        }

        public String getServletInfo()
        {
            return "SimpleFormServlet";
        }
    }