11.1

public class UserServlet  extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String requestURL = req.getRequestURL().toString();
        PrintWriter writer = resp.getWriter();
        if(requestURL != null && requestURL.lastIndexOf("/") > 0){
            requestURL = requestURL.substring(requestURL.lastIndexOf("/") + 1);
            String idStr = req.getParameter("id");
            Integer id = Integer.parseInt(idStr);
            if("add".equals(requestURL)){
                addUser(id);
            } else if("delete".equals(requestURL)){
                deleteUser(id);
            }
            writer.write("success");
            return;
        }

        writer.write("url error");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doPost(req, resp);
    }

    // 新增方法
    private void addUser(Integer id){
        System.out.println("addUser-->" + id);
    }

    // 删除方法
    private void deleteUser(Integer id){
        System.out.println("deleteUser-->" + id);
    }
}