?? 入門 14 - forwardaction,includeaction,switchaction - javaworld@tw.htm
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ForwardAction,IncludeAction,SwitchAction</SPAN> </DIV>
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<DIV class=pagesubheading>Last changed on Oct 27, 2004 by <A
href="http://www.javaworld.com.tw/confluence/display/~koji">koji
lin</A>
</DIV><!-- page content --> 有的時候您只是想要從一個頁面或資源轉換到另一個資源，在MVC/Model
2的架構中，直接使用頁面或資源的路徑來叫用並不是一個好的主意，這會使得控制器沒有機會處理相關的請求事宜。<BR> 您仍應該透過控制器，使用ForwardAction可以幫您完成這個事情，當控制器使用ForwardAction時perform()方法時，它會使用屬性parameter所設定的路徑進行forward的動作，一個設定ForwardAction的例子如下：
<DIV class=code
style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeHeader
style="BORDER-BOTTOM-STYLE: solid"><B>struts-config.xml</B></DIV>
<DIV class=codeContent><PRE><action
path=<SPAN class=java-quote>"/Welcome"</SPAN>
type=<SPAN class=java-quote>"org.apache.struts.actions.ForwardAction"</SPAN>
parameter=<SPAN class=java-quote>"/pages/Welcome.jsp"</SPAN>/></PRE></DIV></DIV><BR> 同樣的，有時候您會需要引入一個頁面或資源，這時您可以使用IncludeAction，其設定方式與ForwardAction相同，只不過它是用include的方式來調用頁面或資源：
<DIV class=code
style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeHeader
style="BORDER-BOTTOM-STYLE: solid"><B>struts-config.xml</B></DIV>
<DIV class=codeContent><PRE><action
path=<SPAN class=java-quote>"/SomeResource"</SPAN>
type=<SPAN class=java-quote>"org.apache.struts.actions.IncludeAction"</SPAN>
parameter=<SPAN class=java-quote>"/path/someServlet"</SPAN>/></PRE></DIV></DIV><BR> SwitchAction用於從一個模組轉換至另一個模組，當您的應用程式分作多個模組時，您有兩個方法可以在模組之間切換，第一個方法是使用相對於Context的路徑來進行
forward 查找，我們之前在介紹模組化時就是使用這個方法：
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style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeHeader
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