Generating output in html or in excel format based on user input

1) HTML Input File :


<html>
<body>

<form  action="readdata" method="get" >
<fieldset>

<br/>
<b> Do you want Request Header Data? ( in Html or Excel)" : </b>
<input type="radio" name="doctype" value="html" checked /> Html
<input type="radio" name="doctype" value="excel" /> Excel
<br/>
<input type="submit" />
</fieldset>
</form>

</body>

2) Servlet that generate dynamic content (in html or in excel format ) based on user input :

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

import java.util.Enumeration;

public class ServletReadData extends HttpServlet {

  public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException

  {

   

String sdoctype = request.getParameter("doctype");

if (sdoctype.equals("html")) {

response.setContentType("text/html"); }

else if (sdoctype.equals("excel") )

{ response.setContentType("application/vnd.ms-excel"); }

   

PrintWriter out = response.getWriter();

out.println("<html> <head> <title> First Servlet ... </title></head>");

out.println("<body> <h1> Java Servlet Request Header Reading.. </h1>");

       Enumeration myheader =request.getHeaderNames();

out.println( "<table border='2'> <tr> <th> Header Name </th><th> Header Values </th> </tr>");

while (myheader.hasMoreElements() )

{

String myhname =(String) myheader.nextElement();

//Header Name

out.println("<tr> <td>");

out.println( myhname);

out.println("</td>");

//values of header

Enumeration myhvalue = request.getHeaders(myhname);

out.println("<td>");

while (myhvalue.hasMoreElements() )

{

out.println(myhvalue.nextElement());

}

out.println("</td>");

out.println("</tr>");

}

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

  }  //end of doPost method

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

  {

doPost(request, response);

  }  //end of doGet method

}