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Servlet Query String

import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.*; public class MyServlet extends HttpServlet {   public void doGet(HttpServletRequest req, HttpServletResponse res)                                throws ServletException, IOException {     res.setContentType("text/plain");     PrintWriter out = res.getWriter();     out.println("Query String:");     out.println(req.getQueryString());     out.println();     out.println("Request Parameters:");     Enumeration e = req.getParameterNames();     while (e.hasMoreElements()) {       String name = (String) e.nextElement();       String values[] = req.getParameterValues(name);       if (values != null) {         for (int i = 0; i < values.length; i++) {           out.println(name + " (" + i + "): " + values[i]);         }       }     }   } } <?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE web-app     PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"     "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd"> <web-app>     <servlet><servlet-name>MyServletName</servlet-name>              <servlet-class>MyServlet</servlet-class>                   </servlet>          <servlet-mapping><servlet-name>MyServletName</servlet-name>         <url-pattern>/index.html</url-pattern>     </servlet-mapping> </web-app>