Struts2 stack of values

1. There are 2 logical parts inside the Valuestack object:

--Objectstack:struts the Action and related objects in the RU Objectstack

--Contextmap:sturts The various mapping relationships (some map types of objects) into the Contextmap, which is actually a reference to Actioncontext

2. Struts will press the following mappings into the Contextmap:

--Parameters: The map contains the request parameters of the current request;

--Request: The map contains all the attributes in the current request object;

--session: The map contains all the attributes in the current session object;

--application: The map contains all the properties of the current Application object;

--attribute: The map retrieves a property in the following order, request, session, application

3. The object properties in the value stack (valuestack) can be accessed directly on the JSP page via OGNL (Object-graphnavigation Language Object-Graph navigation language). If you want to access the data in the Contextmap in the value stack, you need to prefix the OGNL expression # and the search will be performed in Objectstack if there is no prefixed character #.

　　

Struts2 stack of values