React to user form input
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 {
//set the MIME type of the response to "text/html"
response.setContentType("text/html");
//use a PrintWriter send text data to the client
java.io.PrintWriter out = response.getWriter();
//output 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>");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
//display the parameter names and values
Enumeration paramNames = request.getParameterNames();
String parName;
boolean emptyEnum = false;
if (!paramNames.hasMoreElements())
emptyEnum = true;
//set the MIME type of the response to "text/html"
response.setContentType("text/html");
//use a PrintWriter send text data to the client
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>No 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 />");
}
out.println("</body></html>");
}
}
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