Can't compile Servlet file

Fri, 19 Sep 2003 00:03:09 -0700

I use JDK 1.4.1_02 and Tomcat5.0 under Window2000 Server, I have a Servlet file,like follows:
 
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class a1 extends HttpServlet{
 public void doGet(HttpServletResponse req,HttpServletResponse resp) throws ServletException,IOException{
  PrintWriter pw=resp.getWriter();
  pw.println("<html><body>Hello World!</body></html>");
  pw.close();
 }
}
 
but when I compile it,it raises many errors:
 
a1.java:1: package javax.servlet does not exist
import javax.servlet.*;
^
a1.java:2: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
a1.java:4: cannot resolve symbol
symbol  : class HttpServlet
location: class a1
public class a1 extends HttpServlet{
                        ^
a1.java:5: cannot resolve symbol
symbol  : class HttpServletResponse
location: class a1
        public void doGet(HttpServletResponse req,HttpServletResponse resp) thro
ws ServletException,IOException{
                          ^
a1.java:5: cannot resolve symbol
symbol  : class HttpServletResponse
location: class a1
        public void doGet(HttpServletResponse req,HttpServletResponse resp) thro
ws ServletException,IOException{
                                                  ^
a1.java:5: cannot resolve symbol
symbol  : class ServletException
location: class a1
        public void doGet(HttpServletResponse req,HttpServletResponse resp) thro
ws ServletException,IOException{
 
   ^
6 errors
 
 
I know Java not found package javax.servlet, I remember there is a file "servlet.jar" 
in Tomcat4 and I guess to put it in java directory,but Tomcat5 didn't have this file.
How do I to solve this problem?
 
Thanks in advance!
 
 
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