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package coreservlets;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
/** Shows all the par
ameters sent to the servlet via e
ITher
* GET or POST. S
PEcially marks parameters t
hat have
* no values or multiple values.
* <P>
* Taken
From Core Servlets and JavaServer Pages
* f
rom PRentice Hall and Sun Micro
Systems
Press,
* http://www.coreservlets
.COM/.
* &am
p;copy; 2000 Marty Hall; may be freely used or adapted.
*/
p
ublic class ShowParameters extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
t
hrows ServletException, IOException {
response.setContentType("text/ht
ML");
PrintWriter out = response.getWriter();
String title = "Reading All Request Parameters";
out.println(ServletUtilities.headWithTitle(title) +
"<BODY BGCOLOR=\"
#F
DF5E6\">\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 param
names = 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);
}
out.println("</UL>");
}
}
out.println("</TABLE>\n</BODY></HTML>");
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
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