Understanding Getter() and Setter() in Struts.

Question

How to invoke getter() and setter() methods in struts?

Answer 1

See this article regarding general accessors and mutators in Java, and this one for accessors and mutators as specifically applicable to JSP's.

Answer 2

Your question is rather vague. But the typical scenario in Struts2 is: you have an action with some properties which follow the Java bean conventions ( say, a 'myval' property is accesible via getMyval() and setMyval() public methods).

When invoking the action, the default configuration (with default interceptor stack) maps the http parameters calling the setter. Ej, if you call http:/..../myAction.action?myval=xx Struts2 will instance your action and call the method setMyval("xx") (if your property is not a string, struts2 will try to convert it).

After the action execution, when the results are displayed in the view (say,a JSP page), you might write <s:property value='myval' /> and Struts2 will invoke the method getMyval() of your action.

This is the most basic and typical workflow, but I'm simplyfing, everything is much more general and customizable.