问filter过滤器此URL不支持HTTP状态405-HTTP方法GET？

@WebServlet(urlPatterns = {"/jsp/buy/buy-uploadlist.jsp", "/jsp/buy/buy-buylist.jsp"})
public class LoginValidationFilter extends HttpServlet {
    protected FilterConfig filterConfig;
    public LoginValidationFilter() {
    }

    private String encode = "UTF-8";// 默认UTF-8编码

    
    protected void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
        //request.setCharacterEncoding("UTF-8");
        HttpServletRequest req = (HttpServletRequest)request;
        HttpServletResponse resp = (HttpServletResponse)response;
        HttpSession session = req.getSession();
        PrintWriter out = response.getWriter();
        String reqURL = req.getServletPath();
        String loginMess = (String)session.getAttribute("login");
        if(loginMess == null || !loginMess.equals("true")){
            resp.sendRedirect(req.getContextPath() + "/visiterror.jsp");
            return;
        }
        chain.doFilter(request,response);
    }


    public void init(FilterConfig fConfig) throws ServletException{
        this.filterConfig = fConfig;
    }
}