New to servlets

I have downloaded jsdk and tomcat
I tried to run the following program HelloWorld.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloWorld extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<head>");
out.println("<title>Hello World!</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Hello World!</h1>");
out.println("</body>");
out.println("</html>");
}
}
It is showing me an error saying
Package javax.servlet not found.
my javax directory doesnt have servlet directory ...?
Do i need to download javax from somewhere ?
plz let me know ...

javax.servlet is found in servlet.jar, which should be included with Tomcat.

In order to compile servlets, you need to have servlet.jar in your CLASSPATH. So append the path to this jar (found in CATALINA_HOME/common/lib) to your existing CLASSPATH and you should be fine.

JSDK is also a very old package. Unless by jsdk you meant 'tomcat'. If you've downloaded an actual thing called JSDK, then you can remove it from your system, you don't want it. Tomcat has everything you need.

General question: where do people keep finding updated links to jsdk or jswdk? These are in an archived part of java.sun.com.