📄 入門 06 - 使用action類別 - javaworld@tw.htm
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<global-forwards>
<forward
name=<SPAN class=java-quote>"welcome"</SPAN>
path=<SPAN class=java-quote>"/Welcome.<SPAN class=java-keyword>do</SPAN>"</SPAN>/>
</global-forwards>
<action-mappings>
<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>/>
<action
path=<SPAN class=java-quote>"/GetAction"</SPAN>
type=<SPAN class=java-quote>"onlyfun.caterpillar.GetAction"</SPAN>>
<forward
name=<SPAN class=java-quote>"resource"</SPAN>
path=<SPAN class=java-quote>"/pages/showres.jsp"</SPAN>/>
</action>
</action-mappings>
<message-resources parameter=<SPAN class=java-quote>"resources.application"</SPAN>/>
</struts-config></PRE></DIV></DIV><BR> 在<action-mappings>定義中，如果是/GetAction開頭的URI請求，都會交給GetAction物件來處理，其中<forward>標籤定義了如果查找"resource"的forward對象，實際該forward的路徑，
showres.jsp的內容如下，只是簡單的顯示請求資源的路徑而已：
<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>showres.jsp</B></DIV>
<DIV class=codeContent><PRE><%@ taglib uri=<SPAN class=java-quote>"/tags/struts-bean"</SPAN> prefix=<SPAN class=java-quote>"bean"</SPAN> %>
<%@ taglib uri=<SPAN class=java-quote>"/tags/struts-html"</SPAN> prefix=<SPAN class=java-quote>"html"</SPAN> %>
<%@page contentType=<SPAN class=java-quote>"text/html; charset=Big5"</SPAN>%>
<html:html locale=<SPAN class=java-quote>"<SPAN class=java-keyword>true</SPAN>"</SPAN>>
<head>
<title><bean:message key=<SPAN class=java-quote>"welcome.title"</SPAN>/></title>
<html:base/>
</head>
<body bgcolor=<SPAN class=java-quote>"white"</SPAN>>
<H1>請求資源 ${ resource }</H1>
</body>
</html:html></PRE></DIV></DIV><BR> 啟動Servlet容器，並使用http://localhost:8080/HelloStruts/GetAction.do?resource=/images/struts.jpg來瀏覽，您會得到以下的內容：
<DIV class=code
style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeContent><PRE><html lang=<SPAN class=java-quote>"zh"</SPAN>>
<head>
<title>哈囉！Struts！</title>
<base href=<SPAN class=java-quote>"http:<SPAN class=java-comment>//localhost:8080/HelloStruts/pages/showres.jsp"</SPAN>></SPAN>
</head>
<body bgcolor=<SPAN class=java-quote>"white"</SPAN>>
<H1>請求資源 /images/struts.jpg</H1>
</body>
</html></PRE></DIV></DIV><BR> Action物件是執行工作的物件，它主要的工作通常有：<BR>*驗證使用者的進程狀態<BR>*進一步驗證表單物件的資訊<BR>*更新應用程式中物件的狀態<BR>*處理客戶端的請求<BR>*返回ActionForward給ActionServlet<BR> 為了要能夠重用Action物件，通常建議不要在Action中加入過多的邏輯，普遍認為Action物件也應屬於控制器角色，除了以上必要的工作之外，建議將與業務相關的工作交給輔助類別，減少Action物件中的邏輯，以使得Action物件容易理解它的職責。<BR> 基本上不只有Action物件應保持職責清晰，就Struts而言，它的工作是輔助建議MVC/Model
2架構，每個相關的組件除了這個目的之外，沒有其它的目的，Struts建立起來的架構也鼓勵重用，應當將業務相關的邏輯交由其它的物件來處理，而不是交給Struts組件。
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