如何重用httpservlet请求

Question

Hi is there anyway to make a request persistent? In my web application I need to check what Check-box has the user ticked, i get this value by using Request.getPart("Convert File"); After this I need to upload the file the user selects but when I parse the request I get a null value because the request has already been used. Is there any way around this issue? Like saving the request? Any help would be appreciated.

Answer 1

If you need the information in the request for future use, you have to store the information in a wider scope, for example in the session.

//Storing value
Session session = request.getSession();
session.setAttribute("key", "value");

//Retrieve value
session.getAttribute("key")

Answer 2

Use httpSession. You can use api like:

HttpSession session = httpServletRequest.getSession(false);
session.setAttribute("Key", "Value");

And later on when user revisits, you could check same attribute like:

session.getAttribute("Key");