我已有servlet.jar，为什么它还说package http找不到呢？

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程序如下：
package com.wrox.sessions;
import java.util.Vector;
import java.servlet.http.HttpServletRequest;
public class ShoppingCart extends Object {
private Vector cart=null;
String product=null;
String submit=null;
public ShoppingCart(){
cart=new Vector();
}
public void setProduct(String product){
this.product=product;
}
public void setSubmit(String submit){
this.submit=submit;
}
public Vector getProducts(){
return cart;
}
public void addProduct(String product){
cart.add(product);
}
public void removeProduct(String priduct){
cart.remove(product);
}
public void processRequest(HttpServletRequest req){
if (submit!=null){
if (submit.equals("add")){
addProduct(product);
} else {
removeProduct(product);
}
reset();
}
}
public void reset(){
submit=null;
product=null;
}
}
编译时出现如下错误：
D:\tomcat\webapps\cookie\WEB-INF\classes\com\wrox\sessions>javac ShoppingCart.ja
va
ShoppingCart.java:3: cannot resolve symbol
symbol : class HttpServletRequest
location: package http
import java.servlet.http.HttpServletRequest;
^
ShoppingCart.java:30: cannot resolve symbol
symbol : class HttpServletRequest
location: class com.wrox.sessions.ShoppingCart
public void processRequest(HttpServletRequest req){
^
2 errors

我的类路径为：classpath=.;D:\jdk\lib;d:\jdk\jre\lib\rt.jar;d:\tomcat\lib\servlet.jar

我已有servlet.jar，为什么它还说package http找不到呢？
不明白。？？？？

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