Can't compile Servlet - Repost

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Java

servlet

I have created a java servlet program name dbsrv.java. I put it on Tomcat 7.0\webapps\ROOT\WEB-INF\classes\FirstServlet.java and also I set the class path for servlet-api.jar but when I compile it

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

D:\tomcat7\webapps\dbsrv\web-inf\class>javac -d . dbsrv.java
dbsrv.java:3: error: package javax.servlet does not exist
import javax.servlet.*;
^
dbsrv.java:4: error: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
dbsrv.java:8: error: cannot find symbol
public class dbsrv extends HttpServlet{
                           ^
  symbol: class HttpServlet
dbsrv.java:29: error: cannot find symbol
        public void doGet(HttpServletRequest req,HttpServletResponse res)throws
ServletException,IOException{
                          ^
  symbol:   class HttpServletRequest
  location: class dbsrv
dbsrv.java:29: error: cannot find symbol
        public void doGet(HttpServletRequest req,HttpServletResponse res)throws
ServletException,IOException{
                                                 ^
  symbol:   class HttpServletResponse
  location: class dbsrv
dbsrv.java:29: error: cannot find symbol
        public void doGet(HttpServletRequest req,HttpServletResponse res)throws
ServletException,IOException{

^
  symbol:   class ServletException
  location: class dbsrv
dbsrv.java:57: error: cannot find symbol
        public void doPost(HttpServletRequest req,HttpServletResponse res)throws
 ServletException,IOException{
                           ^
  symbol:   class HttpServletRequest
  location: class dbsrv
dbsrv.java:57: error: cannot find symbol
        public void doPost(HttpServletRequest req,HttpServletResponse res)throws
 ServletException,IOException{
                                                  ^
  symbol:   class HttpServletResponse
  location: class dbsrv
dbsrv.java:57: error: cannot find symbol
        public void doPost(HttpServletRequest req,HttpServletResponse res)throws
 ServletException,IOException{

 ^
  symbol:   class ServletException
  location: class dbsrv
9 errors

D:\tomcat7\webapps\dbsrv\web-inf\class>