[javac 编译,]找不到符号，程序包不存在

[right89757]

C:\Users\xuty4\workspace\Beer-v1>javac -classpath C:\apache-tomcat-8.0.3\lib\ser
vlet-api.jar:classes:. -d classes src\com\example\web\BeerSelect.javasrc\com\example\web\BeerSelect.java:3: 错误: 程序包javax.servlet不存在
import javax.servlet.*;
^
src\com\example\web\BeerSelect.java:4: 错误: 程序包javax.servlet.http不存在
import javax.servlet.http.*;
^
src\com\example\web\BeerSelect.java:8: 错误: 找不到符号
public class BeerSelect extends HttpServlet {
^
符号: 类 HttpServlet
src\com\example\web\BeerSelect.java:9: 错误: 找不到符号
public void doPost (HttpServletRequest request, HttpServletResponse resp
onse) throws IOException,ServletException{
^
符号: 类 HttpServletRequest
位置: 类 BeerSelect
src\com\example\web\BeerSelect.java:9: 错误: 找不到符号
public void doPost (HttpServletRequest request, HttpServletResponse resp
onse) throws IOException,ServletException{
^
符号: 类 HttpServletResponse
位置: 类 BeerSelect
src\com\example\web\BeerSelect.java:9: 错误: 找不到符号
public void doPost (HttpServletRequest request, HttpServletResponse resp
onse) throws IOException,ServletException{

^
符号: 类 ServletException
位置: 类 BeerSelect
6 个错误

[right89757]

有没有大神来帮忙呀