Erros na compilacao de codigos servlet

Estou tendo dificuldade para  compilar programas que contem SERVLET, como devo porceder para fazer isso. Segue abaixo os erros que me são retornado.





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E:\APL_2000\HTTPGetServlet.java:3: package javax.servlet does not exist


import javax.servlet.<em>;


^


E:\APL_2000\HTTPGetServlet.java:4: package javax.servlet.http does not exist


import javax.servlet.http.</em>;


^


E:\APL_2000\HTTPGetServlet.java:7: cannot resolve symbol


symbol  : class HttpServlet


location: class HTTPGetServlet


public class HTTPGetServlet extends HttpServlet {


                                    ^


E:\APL_2000\HTTPGetServlet.java:8: cannot resolve symbol


symbol  : class HttpServletRequest


location: class HTTPGetServlet


   public void doGet( HttpServletRequest request,


                      ^


E:\APL_2000\HTTPGetServlet.java:9: cannot resolve symbol


symbol  : class HttpServletResponse


location: class HTTPGetServlet


                      HttpServletResponse response )


                      ^


E:\APL_2000\HTTPGetServlet.java:10: cannot resolve symbol


symbol  : class ServletException


location: class HTTPGetServlet


      throws ServletException, IOException


             ^


6 errors





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