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copied!<p>Typical Struts2 workflow (bear in mind that Struts2 is extremely configurable, its parts are well decoupled)</p> <p><code>struts.xml</code> => defines 'mappings' :</p> <ul> <li>which <code>action</code> is executed for each URL </li> <li>one or more <code>results</code> : which resource (typically a JSP) generates the view for each result returned by the action</li> </ul> <p>Hence, for example, say a <code>struts.xml</code> contains</p> <pre><code> <action name="add" class="example.SumAction"> <result name="error">/Error.jsp</result> <result name="success">/SumResult.jsp</result> </action> </code></pre> <p>And your Java action is:</p> <pre><code> public class SumAction { private int x; private int x; private int z; // getters and setters ommited public String execute() { z = x + y; return "success"; } } </code></pre> <p>Then the request <code>http://mysite.com/mywebapp/add.action?x=10&y=20</code> would make Struts2 to instantiate a <code>SumAction</code> object, set the <code>x</code> and <code>y</code> properties and call the <code>execute</code> method. If "success" is returned, then it will place the action in some "scope", forward to "/SumResult.jsp" in which typically one use some struts2 tag to show the result, pulling it from the action object.</p> <pre><code> Result: <b><s:property value="z" /></b> </code></pre> <p>Of course, in less trivial scenarios the <code>execute()</code> method would call the service layer.</p> <p>So, it's not very clear if the action is controller or controller+model, I'd say the later, because it not only has the logic to process the request but also acts as a container of the data (input and result). But only during the scope of a request.</p>

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