Samuel Learning

The framework provides several access helpers to access Session, Application, Request scopes.

框架提供了多種訪問Session，Application和Request范圍內值的幫助器。

Web agnostic (independent of the servlet API) with a single line of code.

Web agnostic (獨立于Servlet API)用一個簡單的代碼。

Map session = (Map) ActionContext.getContext().get("session");
session.put("myId",myProp);

ServletActionContext.getRequest().getSession()

Do not use ActionContext.getContext() in the constructor of your Action class. The values may not be set up, and the call may return null for getSession(). 別在Action的構造函數里用ActionContext.getContext()，那個值可能沒有建立，可能返回null。

If you must have get access to the HttpSession, use the ServletConfigInterceptor (see test:Interceptors).

如果你必須訪問HttpSession,用ServletConfigInterceptor。

In your views, you can access with your JavaServer Pages with calls to the implicit properties session and request.

下面展示了在jsp中如果和訪問session和request

<saf: property value="#session.myId" />

<saf: property value="#request.myId" />

All the servlet scopes can be accessed via the ActionContext.

下面展示了在servlet范圍如何通過ActonContext訪問：

Map request = (Map) ActionContext.getContext().get("request");
request.put("myId",myProp);

Map application = (Map) ActionContext.getContext().get("application");
application.put("myId",myProp);

Map session = (Map) ActionContext.getContext().get("session");
session.put("myId", myProp);

Map attr = (Map) ActionContext.getContext().get("attr");
attr.put("myId",myProp);

The attr map will search the javax.servlet.jsp.PageContext for the specified key. If the PageContext doean't exist, it will search request}, {{session, and application respectively.