无法获取javaweb响应setAttribute
我是初学者。我想在servlet上练习。在同一个servlet中,我不知道为什么我不能获得attritube,在无法获取javaweb响应setAttribute,java,servlets,jakarta-ee,Java,Servlets,Jakarta Ee,我是初学者。我想在servlet上练习。在同一个servlet中,我不知道为什么我不能获得attritube,在forward之后,我也不能获得属性 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8");
forward
之后,我也不能获得属性
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
request.setAttribute("aa","asd");
System.out.println(request.getAttribute("aa"));
RequestDispatcher requestDispatcher = request.getRequestDispatcher("/WEB-INF/classes/ResultServlet");
requestDispatcher.forward(request,response);
}
在servlet上打印时需要使用以下命令
PrintWriter out = response.getWriter();
out.print(request.getAttribute("aa"));
在getRequestDispatcher()
中,您需要提供资源的url。您已经传递了servlet的类文件路径。WEB-INF下的文件不能直接访问。
将servlet文件和一些包放在src
文件夹下。并且只传递servlet名称
PrintWriter out = response.getWriter();
out.print(request.getAttribute("aa"));