Data access in Struts2 and Struts2

Data access in Struts2 and Struts2

Access Data in Struts2.

The storage area is divided into two parts.

1. valueStack. Value stack. The structure, for example, is not a key-value pair.

Storage:

Inherit actionSupport in the action class to implement modelDriven

List list = dao. getXXX ();

Create the set and get methods of the list. In this case, the Framework automatically presses the list to the top of the stack. Or ActionContext. getContext (). getValueStack (). push (object );

Take: Write the attribute name directly. <S: property value = "property name"/>

2. Map

Is the form of key-value pairs, including application, session, request, etc., can store map data.

Storage:

Map <String, Object> session = ActionContext. getContext (). getSession ();

Session. put ("list", list );

Take:

Need to add # To retrieve, <s: property value = "# property name"/>