Java Servlet调度程序到另一个Java文件

Question

爪哇

public class Forward extends HttpServlet {

    public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {

        res.setContentType("text/html");
        PrintWriter out = res.getWriter();

        req.setAttribute("option", "forward");

        RequestDispatcher dispatcher = req.getRequestDispatcher("/GotoHere");
        dispatcher.forward(req, res);

    }
}

XML

  <servlet>
        <servlet-name>GotoHere</servlet-name>
        <servlet-class>examples.GotoHere</servlet-class>
  </servlet>
  <servlet-mapping>
        <servlet-name>GotoHere</servlet-name>
        <url-pattern>/GotoHere</url-pattern>
  </servlet-mapping>

我在网页上收到了此错误消息：HTTP Status 500 - Error instantiating servlet class examples.GotoHere

我看了这个问题，Java servlet not dispatching to another servlet，这与我的相似，所以我改变了

RequestDispatcher dispatcher = req.getRequestDispatcher("/GotoHere"); 

到

ServletContext context = getServletContext();
RequestDispatcher dispatcher = context.getNamedDispatcher("GotoHere");

但它仍然无效。任何想法？

Answer 1

试试这个：

 ServletContext context = getServletContext();  
 RequestDispatcher dispatcher = context.getRequestDispatcher("/GotoHere");
 dispatcher.forward(request, response);

Answer 2

试试这个：

    req.setAttribute("option", "forward");
    res.sendRedirect("GoToHere");