📄 入門 05 - 簡介actionmapping類別 - javaworld@tw.htm
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<action
path=<SPAN class=java-quote>"Logout"</SPAN>
type=<SPAN class=java-quote>"onlyfun.caterpillar.LogoutAction"</SPAN>>
....
</action>
</action-mappings></PRE></DIV></DIV><BR> 則當請求的URL是http://localhost:8080/HelloStruts/Login.do，ActionServlet會使用
\Login來找出path設定為Login的ActionMapping物件，該ActionMapping物件告知ActionServlet要使用
onlyfun.caterpillar.LoginAction，而後ActionServlet會將呼叫LoginAction的execute()
方法，並將ActionMapping物件當作參數傳遞給它。<BR> ActionServlet實際上將工作交給Action物件，然而Action物件的運作必須提供一些參數來描述工作的細節，諸如使用哪一個
ActionForm、forward對象的查找、錯誤發生時的頁面對象等等，Struts將這些資訊包裝在ActionMapping中，並作為參數傳送給Action物件，以使得Action在需要相關的資訊時可以從ActionMapping中取得。<BR> 對於沒有定義的ActionMapping，如果客戶端請求了怎麼辦？Struts會丟出
404 Invalid path 的訊息，您可以撰寫匿名的ActionMapping來提供自己的錯誤訊息：
<DIV class=code
style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeContent><PRE><action>
name=<SPAN class=java-quote>"error"</SPAN>
unknown=<SPAN class=java-quote>"<SPAN class=java-keyword>true</SPAN>"</SPAN>
forward=<SPAN class=java-quote>"/pages/error.jsp"</SPAN>/></PRE></DIV></DIV><BR> 如果ActionServlet收到的沒有定義的Action請求，則會交由匿名的ActionMapping來處理。<BR> 在Struts中，ActionMapping繼承自ActionConfig，大部份的屬性定義實際上都已經在ActionConfig中完成，不過ActionMapping仍舊存在，根據線上API的說明，繼承存在的事實基於它仍是現存應用程式所使用的公用類別。
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