Access Struts 2 action class properties directly

问题

I want to know if we populates action class properties, can we access them directly in the result JSP with out assign them to a form in the action class?

回答1:

I think you need to have the bean getter method defined properly . Say , if a property is named id and you have a method called getId() in your action. Then it can be accessed directly in the JSP as :

OGNL expression:

<s:property value="id"/>

JSTL expression:

<c:out value="${action.id}"/>

回答2:

one thing u can do is that initialize the properties in the ModelDriven Class which u want to be intialized whenever your action is called.

http://struts.apache.org/release/2.1.x/docs/model-driven.html

回答3:

Struts2/XWork1 and its taglib is oriented towards OGNL, which is using a valueStack for all action properties. These values are not direct available for the expression language of JSP2.0/JSTL1.1.

To access it via OGNL you can use OGNL only in Struts tag attributes. For example

public String MyAction extends ActionSupport {
  private String myAttr;
  //getter and setter here
  ...


<s:set var="myAttrz" value="myAttr" scope="request"/>
${myAttrz} or ${myAttr} will just print out the value.
<%=request.getAttribute("myAttrz")%>

In the first tag the action attribute is accessed as OGNL expression
In the second line as JSTL expression.
In the third line scriptlets.

References: