📄 入門 16 - 使用lookupdispatchaction類別 - javaworld@tw.htm
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<DIV class=pageheader><SPAN class=pagetitle>入門 16 -
使用LookupDispatchAction類別</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 --> org.apache.struts.actions.LookupDispatchAction類別是DispatchAction類別的子類，與DispatchAction類似的是，它透過請求上的參數來決定該執行哪一個方法，不過LookupDispatchAction多了查詢訊息資源檔案的功能，LookupDispatchAction的用處之後，就是當一個表單中包括兩個以上同名的送出按鈕時，可以透過查詢訊息資源檔來確定相對應的動作。
<BR> 直接以實例來說明，在繼承LookupDispatchAction之後，您要重新定義getKeyMethodMap()方法，並定義好自己的相關處理方法，例如：
<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>ShoppingAction.java</B></DIV>
<DIV class=codeContent><PRE><SPAN class=java-keyword>package</SPAN> onlyfun.caterpillar;
<SPAN class=java-keyword>import</SPAN> javax.servlet.http.*;
<SPAN class=java-keyword>import</SPAN> org.apache.struts.action.*;
<SPAN class=java-keyword>import</SPAN> org.apache.struts.actions.*;
<SPAN class=java-keyword>public</SPAN> class ShoppingAction <SPAN class=java-keyword>extends</SPAN> LookupDispatchAction {
<SPAN class=java-keyword>protected</SPAN> Map getKeyMethodMap() {
Map map = <SPAN class=java-keyword>new</SPAN> HashMap();
map.put(<SPAN class=java-quote>"button.<SPAN class=java-keyword>continue</SPAN>"</SPAN>, <SPAN class=java-quote>"<SPAN class=java-keyword>continue</SPAN>"</SPAN>);
map.put(<SPAN class=java-quote>"button.checkout"</SPAN>, <SPAN class=java-quote>"checkout"</SPAN>);
<SPAN class=java-keyword>return</SPAN> map;
}
<SPAN class=java-keyword>public</SPAN> ActionForward <SPAN class=java-keyword>continue</SPAN>(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
<SPAN class=java-keyword>throws</SPAN> Exception {
<SPAN class=java-comment>// ...... </SPAN>
}
<SPAN class=java-keyword>public</SPAN> ActionForward checkout(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
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