Servelt页面未使用Servlet重定向到第二页

Question

我是servlet jsp的初学者。如果登录成功页面连同用户名一起重定向到第二个servlet，我将创建一个简单的登录表单。但它不起作用，它显示错误java.lang.IllegalArgumentException：路径秒不是以“ /”字符开头我到目前为止尝试过的内容附在下面。

Form

 <div class="row">
                <form method="POST" action="login">
                <div class="form-group">
                    <label>Username</label>
                    <input type="text" id="uname" name="uname" placeholder="uname" class="form-control"> 
                </div>

                 <div class="form-group">
                    <label>Password</label>
                    <input type="password" id="pword" name="pword" placeholder="pword" class="form-control">

                </div>


                 <div class="form-group">


                     <input type="submit" value="submit" class="btn btn-success">

                </div>

                </form>


            </div>

登录 Servlet页面

@WebServlet("/login")
public class login extends HttpServlet {
  @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException 
    {

         String uname = request.getParameter("uname");
         String pass = request.getParameter("pword");

         if(uname.equals("John") && pass.equals("123"))
         {
            PrintWriter out = response.getWriter();
            HttpSession session = request.getSession(true); 
            session.putValue("username", uname);

            ServletContext context=getServletContext();
            RequestDispatcher rd=context.getRequestDispatcher("second");  

            rd.forward(request, response);  

         }



    }

第二Servlet页面

@WebServlet("/second")
public class second extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException 
    {
        PrintWriter out = response.getWriter();
         HttpSession session = request.getSession(true);
       String uname = (String)session.getValue("uname");
        out.println("User Name is " + uname);

    }

Answer 1

此异常表明，路径不是以“ /”开头。请尝试以下。

 RequestDispatcher rd=context.getRequestDispatcher("/second");