package coreservlets;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

/** Shows all the parameters sent to the servlet via either
* GET or POST. Specially marks parameters that have
* no values or multiple values.
* P>
* Taken from Core Servlets and JavaServer Pages
* from Prentice Hall and Sun Microsystems Press,
* http://www.coreservlets.com/.
* copy; 2000 Marty Hall; may be freely used or adapted.
*/

public class ShowParameters extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Reading All Request Parameters";
out.println(ServletUtilities.headWithTitle(title) +
"BODY BGCOLOR=\&;#FDF5E6\&;>\n" +
"H1 ALIGN=CENTER>" + title + "/H1>\n" +
"TABLE BORDER=1 ALIGN=CENTER>\n" +
"TR BGCOLOR=\&;#FFAD00\&;>\n" +
"TH>Parameter NameTH>Parameter Value(s)");
Enumeration paramNames = request.getParameterNames();
while(paramNames.hasMoreElements()) {
String paramName = (String)paramNames.nextElement();
out.print("TR>TD>" + paramName + "\nTD>");
String[] paramValues =
request.getParameterValues(paramName);
if (paramValues.length == 1) {
String paramValue = paramValues[0];
if (paramValue.length() == 0)
out.println("I>No Value/I>");
else
out.println(paramValue);
} else {
out.println("UL>");
for(int i=0; iparamValues.length; i++) {
out.println("LI>" + paramValues);
}
out.println("/UL>");
}
}
out.println("/TABLE>\n/BODY>/HTML>");
}

public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}