📄 入門 13 - 從actionservlet到requestprocessor - javaworld@tw.htm
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<SPAN class=java-comment>// 前置處理，預設返回 <SPAN class=java-keyword>true</SPAN>，子類可以重新定義它以決定要不要繼續處理</SPAN>
<SPAN class=java-keyword>if</SPAN>(!processPreProcess(request, response)) {
<SPAN class=java-keyword>return</SPAN>;
}
<SPAN class=java-comment>// 從URI路徑確定ActionMapping</SPAN>
ActionMapping mapping = processMapping(request, response, path);
<SPAN class=java-keyword>if</SPAN>(mapping == <SPAN class=java-keyword>null</SPAN>) {
<SPAN class=java-keyword>return</SPAN>;
}
....
<SPAN class=java-comment>// 處理ActionForm，如果沒有就新增一個，之後一直使用它</SPAN>
ActionForm form = processActionForm(request, response, mapping);
<SPAN class=java-comment>// 將表單的欄位值填入ActionForm</SPAN>
processPopulate(request, response, form, mapping);
<SPAN class=java-comment>// 判斷是否執行ActionForm的validate()方法</SPAN>
<SPAN class=java-keyword>if</SPAN>(!processValidate(request, response, form, mapping)) {
<SPAN class=java-keyword>return</SPAN>;
}
<SPAN class=java-comment>// 判斷 <action> 標籤的 forward 或 include 標籤是不是被設定</SPAN>
<SPAN class=java-comment>// 這兩個標籤在設定一個路徑，其與 type 屬性是互斥的，當設定</SPAN>
<SPAN class=java-comment>// 其中一個屬性時，調用 RequestDispatcher 的 forward() 或</SPAN>
<SPAN class=java-comment>// include() ，其作用與設定ForwardAction或IncludeAction相同</SPAN>
<SPAN class=java-comment>// 直接繞送而不再使用Action物件進行接下來的處理</SPAN>
<SPAN class=java-keyword>if</SPAN>(!processForward(request, response, mapping)) {
<SPAN class=java-keyword>return</SPAN>;
}
<SPAN class=java-keyword>if</SPAN>(processInclude(request, response, mapping)) {
<SPAN class=java-keyword>return</SPAN>;
}
<SPAN class=java-comment>// 處理Action，如果沒有就生成一個，之後一直使用它</SPAN>
Action action = processActionCreate(request, response, mapping);
<SPAN class=java-keyword>if</SPAN>(action == <SPAN class=java-keyword>null</SPAN>) {
<SPAN class=java-keyword>return</SPAN>;
}
<SPAN class=java-comment>// 呼叫Action的execute()或perform()方法，並返回ActionForward</SPAN>
ActionForward forward = processActionPerform(request, response, action, <SPAN class=java-keyword>for</SPAN>, mapping);
<SPAN class=java-comment>// 處理ActionForward</SPAN>
processActionForward(request, response, forward);
}</PRE></DIV></DIV><BR> 您可以繼承RequestProcessor，並改寫其中的processXXXXX()方法來自定義請求的處理方式，如果您要使用自己的
RequestProcessor，要要在struts-config.xml中使用<controller>標籤來定義，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>struts-config.xml</B></DIV>
<DIV class=codeContent><PRE><controller
contentType=<SPAN class=java-quote>"text/html;charset=Big5"</SPAN>
locale=<SPAN class=java-quote>"<SPAN class=java-keyword>true</SPAN>"</SPAN>
nocache=<SPAN class=java-quote>"<SPAN class=java-keyword>true</SPAN>"</SPAN>
processorClass=<SPAN class=java-quote>"onlyfun.caterpillar.CustomRequestProcessor"</SPAN>/></PRE></DIV></DIV><BR> 在Struts
1.1中，新增了<controller>標籤，它用於指定給ActionServlet的一些參數，在Struts
1.1之前，這些參數是在<init-params>中加以指定，使用<controller>標籤，應用程式中不同的模組也可以指定各自的參數給ActionServlet。
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