// Example Form Handler Servlet. You may use to help with assignments.
// 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 -- Echo 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 "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()
* gather data and respond to browser
************************************************************ */
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
// first, set the "content type" header of the response
response.setContentType ("text/html");
//Get the response's PrintWriter to return text to the client.
PrintWriter toClient = response.getWriter ();
String para;
Enumeration paraNames = request.getParameterNames();
toClient.println("");
toClient.println("");
toClient.println(" Generic 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("");
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 = request.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 request,
HttpServletResponse response)
throws ServletException, IOException
{
response.setContentType("text/html");
//Get the response's PrintWriter to return text to the client.
PrintWriter out = response.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