servlet请求setAttibute和getParameter java的问题

Question

@Overrideprotected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    request.setAttribute("orden", 11);    System.out.println("ord "+request.getParameter("orden"));//returns null    request.getRequestDispatcher("/view/a.jsp").forward(request, response);}//Why does this happen?和我的jsp是一样的 result = null

Answer 1

你正在设置一个attribute并试图获得一个parameter

request.setAttribute("orden", 11);

request.getAttribute("orden");

Answer 2

属性和参数是不同的东西。在设置属性时，请使用 getAttribute() 获取值。

System.out.println("ord "+request.getAtribute("orden"));