请求属性在从一个 Servlet 转发到另一个 Servlet 的过程中丢失

Question

In my web application I have 2 servlets where one pass data to another. Please check the below code.

RequestDispatcher requestDispatcher = request.getRequestDispatcher("LoadCategoryList");
            request.setAttribute("save_result", result);
            requestDispatcher.forward(request, response);

In this code I am passing data save_result to LoadCategoryList . Below is how I try to collect this data in LoadCategoryList

String result = request.getParameter("save_result");

Anyway, the passed data seems to be NULL . But I can GUARANTEE that data I am passing are not NULL . What's wrong here?

Answer 1

Request parameters and request attributes are two different things.

If you set a value using ServletRequest.setAttribute() , you have to retrieve it using ServletRequest.getAttribute() .