Struts 2中的Java应用程序可以管理多少个会话？

Question

I am working on Transaction Management application, and I am using Struts2. I have used internally a session for setting and getting values like

ActionContext.getContext().getSession().put("string", string);

Is there any limit or any disadvantage of using a session like this in the application?

Answer 1

Limit is the size of your computers physical memory.you dont store dynamic values in session because someone can modify them in the meanwhile , so store only those values in session which represent any user specific data or static values (ie which are not going to be changed while session exists).

Note : static here is not static keyword .

Answer 2

There's no limit. The session in Struts 2 is implemented as a Map to simplify access to servlet session's attributes.

I have written in this answer:

The SessionMap is specifically designed for the purposes if you want to have access to the servlet session attributes. So, the user is able to keep a synchronized collection of objects in session and use it instead of HttpSession directly.

I know only one disadvantage if you get the session from the action context, it might return null . The solution is in this answer.

There are two methods to obtain a session map to the action:

1. Implement SessionAware . By default the session map is populated on action call. This is a preferable way.
2. Get a session map from the action context. This way you should make sure the request is handled by the Struts2 filter.

The first method is preferred , as explained in the docs page, allows you use a session in tests.

Answer 3

It's your size of the internal/physical memory of the system. The session is create a singleton class in your war file.The war file is stored in your Server. The server is in your C: folder in windows. So the session is depends on your physical memory.