/** File name: FormHandler.java
*
* Author: Quansheng Xiao, Jeff Offutt
*
* Date: 9-11-2001
*/
// Import Servlet Libraries
import javax.servlet.*;
import javax.servlet.http.*;
// Import Java Libraries
import java.io.*;
import java.util.*;
import java.lang.*;
// FormHandler class
// Generic form handler -- feed back all the parameters and values
// that a client inputs from an HTML form.
// Note: the "name" of the submit button in the form must be "submit"
// (ignore case) or the servlet will print out "submit" parameter.
// CONSTRUCTOR: no constructor specified (default)
//
// **************** Methods description *******************************
// void doPost () --> Main method for gathering data and sending back
// void doGet () --> Not used.
//***********************************************************************
public class FormHandler extends HttpServlet
{
/** **********************************************************
* doPost()
* gathering data and sending back to browser
************************************************************ */
public void doPost (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
// first, set the "content type" header of the response
res.setContentType ("text/html");
//Get the response's PrintWriter to return text to the client.
PrintWriter toClient = res.getWriter ();
String para;
Enumeration paraNames = req.getParameterNames ();
toClient.println ("");
toClient.println ("");
toClient.println ("Simple Form Handler");
toClient.println ("");
toClient.println ("");
toClient.println ("");
toClient.println ("Generic Form Handler
");
toClient.println ("");
toClient.println ("The following table lists all parameter names and");
toClient.println ("their values that were submitted from your form.");
toClient.println ("
");
toClient.println ("Designed and written by:
");
toClient.println (" Jeff Offutt & Quansheng Xiao, Sept 2001
");
toClient.println ("");
toClient.println ("");
toClient.println ("
");
toClient.println ("");
toClient.println (" ");
toClient.println (" | Parameter");
toClient.println (" | Value");
toClient.println (" |
");
while (paraNames.hasMoreElements ())
{ // For each parameter name.
para = (String)paraNames.nextElement ();
if (!para.equalsIgnoreCase ("submit"))
{
toClient.println (" ");
toClient.println (" | "
+ para + " | ");
String[] values = req.getParameterValues (para);
if (values != null && !values[0].equals(""))
toClient.println (" " + values[0] + " |
");
else
toClient.println (" | ");
for (int i = 1; i < values.length; i++)
{
if (!values[i].equals(""))
{
toClient.println (" ");
toClient.println (" | | ");
toClient.println (" " + values[i] + " |
");
}
}
}
}
toClient.println ("
");
toClient.println ("");
toClient.println ("");
toClient.println ("");
toClient.println ("");
// Close the writer; the response is done.
toClient.close();
} //end of doPost()
/** *****************************************************
* doGet()
* not used
********************************************************* */
public void doGet (HttpServletRequest req,
HttpServletResponse res)
throws ServletException, IOException
{
res.setContentType("text/html");
//Get the response's PrintWriter to return text to the client.
PrintWriter out = res.getWriter();
String title = "This is from FormHandler Servlet";
out.println("");
out.println("");
out.println("" + title + "");
out.println("");
out.println("");
out.println("" + title + "
");
out.println("Please run the Servlet from FormHandler.html.");
out.println("");
out.println("");
out.close();
} // End doGet()
} // End FormHandler class