<servlet>
<servlet-name>FirstServlet</servlet-name>
<servlet-class>servlet.study3.c1.FirstServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FirstServlet</servlet-name>
<url-pattern>/firstservlet</url-pattern>
</servlet-mapping>
</web-app>
package servlet.study3.c1;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.PrintWriter;import java.io.IOException;import java.util.*;
public class FirstServlet extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException{ response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html><head>"); out.println("<title>Help Page</title></head><body>"); out.println("<h2>Please submit your information</h2>"); out.println("<form method='post' action='/jsp/firstservlet'>"); out.println("<table width=\"400\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">"); out.println("<tr>"); out.println("<td>Your First name: </td>"); out.println("<td><input type=\"text\" name=\"firstname\"></td>"); out.println("</tr>"); out.println("<tr>"); out.println("<td>Your Last name:</td>"); out.println("<td><input type=\"text\" name=\"lastname\"></td>"); out.println("</tr>"); out.println("<tr>"); out.println("<td>Your email: </td>"); out.println("<td><input type=\"text\" name=\"email\"></td>"); out.println("</tr>"); out.println("</table>"); out.println("<br>"); out.println("<input type=\"submit\" name=\"Submit\" value=\"submit\">"); out.println("</form>"); out.println("</body></html>");
} public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{ Enumeration paramNames = request.getParameterNames(); String parName; boolean emptyEnum = false; if(!paramNames.hasMoreElements()) emptyEnum = true; response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html><head>"); out.println("<title>Submitted Parameters</title></head><body>"); if(emptyEnum){ out.println("<h2>Sorry, the request does net 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>"); } out.println("</body></html>"); }
}]]>