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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/.
* © 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 name<th>parameter value(s)");
enumeration paramnames = request.getparameternames();
while(paramnames.hasmoreelements()) {
string paramname = (string)paramnames.nextelement();
out.print("<tr><td>" + paramname + "\n<td>");
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; i<paramvalues.length; i++) {
out.println("<li>" + paramvalues[i]);
}
out.println("</ul>");
}
}
out.println("</table>\n</body></html>");
}
public void dopost(httpservletrequest request,
httpservletresponse response)
throws servletexception, ioexception {
doget(request, response);
}
}
