package com.jspservletcookbook;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class FirstServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
System.out.println("command: "+request.getParameter("command"));
//set the MIME type of the response, "text/html"
response.setContentType("text/html");
//use a PrintWriter send text data to the client who has requested the servlet
java.io.PrintWriter out = response.getWriter();
//Begin assembling the HTML content
out.println("<html><head>");
out.println("<title>Help Page</title></head><body>");
out.println("<h2>Please submit your information</h2>");
//make sure method="post" so that the servlet service method
//calls doPost in the response to this form submit
out.println(
"<form method=\"post\" action =\"" + request.getContextPath() +
"/firstservlet\" >");
out.println("<table border=\"0\"><tr><td valign=\"top\">");
out.println("Your first name: </td> <td valign=\"top\">");
out.println("<input type=\"text\" name=\"firstname\" size=\"20\">");
out.println("</td></tr><tr><td valign=\"top\">");
out.println("Your last name: </td> <td valign=\"top\">");
out.println("<input type=\"text\" name=\"lastname\" size=\"20\">");
out.println("</td></tr><tr><td valign=\"top\">");
out.println("Your email: </td> <td valign=\"top\">");
out.println("<input type=\"text\" name=\"email\" size=\"20\">");
out.println("</td></tr><tr><td valign=\"top\">");
out.println("<input type=\"submit\" value=\"Submit Info\"></td></tr>");
out.println("</table></form>");
out.println("</body></html>");
} //end doGet
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException,java.io.IOException{
//display the parameter names and values
Enumeration paramNames = request.getParameterNames();
String parName;//this will hold the name of the parameter from the HTML form
boolean emptyEnum = false;
if (! paramNames.hasMoreElements())
emptyEnum = true;
//set the MIME type of the response, "text/html"
response.setContentType("text/html");
//use a PrintWriter send text data to the client who has requested the servlet
java.io.PrintWriter out = response.getWriter();
//Begin assembling the HTML content
out.println("<html><head>");
out.println("<title>Submitted Parameters</title></head><body>");
if (emptyEnum){
out.println("<h2>Sorry, the request does not contain any parameters</h2>");
} else {
out.println("<h2>Here are the submitted parameter values</h2>");
}
while(paramNames.hasMoreElements()){
parName = (String) paramNames.nextElement();
out.println("<strong>" + parName + "</strong> : " + request.getParameter(parName));
out.println("<br />");
}//while
out.println("</body></html>");
}// doPost
}
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