📄 入門 16 - 使用lookupdispatchaction類別 - javaworld@tw.htm
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HttpServletResponse response)
<SPAN class=java-keyword>throws</SPAN> Exception {
<SPAN class=java-comment>// ...... </SPAN>
}
}</PRE></DIV></DIV><BR> 假設訊息資源檔中包括以下的訊息：
<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>application.properties</B></DIV>
<DIV class=codeContent><PRE>button.<SPAN class=java-keyword>continue</SPAN>=Continue
button.checkout=Checkout</PRE></DIV></DIV><BR> 為了要使用LookupDispatchAction，我們如同DispatchAction一樣在struts-config.xml中定義請求參數中該有的名稱：
<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>"/shopping"</SPAN>
type=<SPAN class=java-quote>"onlyfun.caterpillar.ShoppingAction"</SPAN>
parameter=<SPAN class=java-quote>"method"</SPAN>
name=<SPAN class=java-quote>"cartForm"</SPAN>/></PRE></DIV></DIV><BR> 現在假設您的表單頁面包括以下的內容：
<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:form action=<SPAN class=java-quote>"/shopping"</SPAN>>
<html:submit property=<SPAN class=java-quote>"method"</SPAN>>
<bean:message key=<SPAN class=java-quote>"button.<SPAN class=java-keyword>continue</SPAN>"</SPAN>/>
</html:submit>
<html:submit property=<SPAN class=java-quote>"method"</SPAN>>
<bean:message key=<SPAN class=java-quote>"button.checkout"</SPAN>/>
</html:submit>
</html:form></PRE></DIV></DIV><BR> 這些Struts自訂標籤在執行後會產生以下的內容：
<DIV class=code
style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeContent><PRE><form name=<SPAN class=java-quote>"cartForm"</SPAN> method=<SPAN class=java-quote>"post"</SPAN> action=<SPAN class=java-quote>"/HelloStruts/shopping.<SPAN class=java-keyword>do</SPAN>"</SPAN>>
<input type=<SPAN class=java-quote>"submit"</SPAN> name=<SPAN class=java-quote>"method"</SPAN> value=<SPAN class=java-quote>"Continue"</SPAN>/>
<input type=<SPAN class=java-quote>"submit"</SPAN> name=<SPAN class=java-quote>"method"</SPAN> value=<SPAN class=java-quote>"Checkout"</SPAN>/>
</form></PRE></DIV></DIV><BR> 所以當您按下任一個按鈕時，請求參數中會包括method=Continue或是method=Checkout，假設是method=Continue好了，LookupDispatchAction會根據它作為value，在訊息資訊檔找到對應的key，然後根據key與getKeyMethodMap()得知要執行的方法為continue()方法。
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