📄 入門 02 - struts基本運作流程 - javaworld@tw.htm
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Struts基本運作流程</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 --> 在Struts實現MVC/Model
2方式中，擔任控制器（Controller）角色的是org.apache.struts.action.ActionServlet，它繼承自
javax.servlet.http.HttpServlet，通常會直接使用ActionServlet，在web.xml中配置相關的組態，就如同配置一般的Servlet一樣，您也可以配置一些相關的初始參數給ActionServlet使用。<BR> 在MVC/Model
2的架構中，理想上客戶端不會直接要求資源或指定請求的JSP頁面，所有客戶的請求都必須發送至控制器，由控制器決定該轉發給哪一個物件進行處理、決定該由哪一個視圖頁面進行顯示與回應。<BR> 在Struts中，擔任控制器的是ActionServlet，所有的請求都發送給ActionServlet，對於ActionServlet
來說，doGet()會將調用doPost()，所以無論請求是GET或POST在行為上都是相同的，ActionServlet藉由組態檔struts
-config.xml知道如何分配物件來處理請求，這包括了org.apache.struts.action.ActionMapping、
org.apache.struts.action.ActionForm、org.apache.struts.action.Action等物件的分配，struts-config.xml是整個Struts運作的重心。<BR> ActionServlet會將處理的控制權暫時交給Action物件，在Action中，您可以藉由一些資料傳輸物件（Data
Transfer Object）、輔助類別（Helper
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