📄 入門 10 - map-backed actionform - javaworld@tw.htm
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<SPAN class=java-keyword>import</SPAN> javax.servlet.http.*;
<SPAN class=java-keyword>import</SPAN> org.apache.struts.action.*;
<SPAN class=java-keyword>public</SPAN> class LoginAction <SPAN class=java-keyword>extends</SPAN> Action {
<SPAN class=java-keyword>public</SPAN> ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
<SPAN class=java-keyword>throws</SPAN> Exception {
UserForm userForm = (UserForm) form;
<SPAN class=java-object>String</SPAN> name = (<SPAN class=java-object>String</SPAN>) userForm.getValue(<SPAN class=java-quote>"name"</SPAN>);
<SPAN class=java-object>String</SPAN> password = (<SPAN class=java-object>String</SPAN>) userForm.getValue(<SPAN class=java-quote>"password"</SPAN>);
<SPAN class=java-keyword>if</SPAN>(name.equals(<SPAN class=java-quote>"caterpillar"</SPAN>) && password.equals(<SPAN class=java-quote>"1234"</SPAN>)) {
request.setAttribute(<SPAN class=java-quote>"valid_user"</SPAN>, form);
<SPAN class=java-keyword>return</SPAN> mapping.findForward(<SPAN class=java-quote>"greeting"</SPAN>);
}
<SPAN class=java-keyword>return</SPAN> mapping.findForward(<SPAN class=java-quote>"welcome"</SPAN>);
}
}</PRE></DIV></DIV><BR> 為了要能夠設定值給這個ActionForm，在表單上，您要使用name="value(key)"來設定欄位名稱，例如：
<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>"/LoginAction"</SPAN> focus=<SPAN class=java-quote>"name"</SPAN>>
名稱：<html:text property=<SPAN class=java-quote>"value(name)"</SPAN> size=<SPAN class=java-quote>"20"</SPAN>/><br>
密碼：<html:password property=<SPAN class=java-quote>"value(password)"</SPAN> size=<SPAN class=java-quote>"20"</SPAN>/><br>
<html:submit/> <html:reset/>
</html:form></PRE></DIV></DIV><BR> 同樣的，如果要使用<bean:write>標籤來寫出ActionForm的值，我們也要使用value(key)的方法來取值，例如：
<DIV class=code
style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeContent><PRE><logic:present scope=<SPAN class=java-quote>"request"</SPAN> name=<SPAN class=java-quote>"valid_user"</SPAN>>
<bean:write name=<SPAN class=java-quote>"valid_user"</SPAN> property=<SPAN class=java-quote>"value(name)"</SPAN>/>您好，這是您的神秘禮物！
</logic:present></PRE></DIV></DIV><BR> 在我們的ActionForm中，我們提供了getMap()方法，這樣作可以方便透過EL來取值，例如：
<DIV class=code
style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeContent><PRE>${valid_user.map.name}
${valid_user.map.password}</PRE></DIV></DIV><!-- page content ends --><!--<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/"><rdf:Description rdf:about="http://www.javaworld.com.tw/confluence/pages/viewpage.action?pageId=502" dc:identifier="http://www.javaworld.com.tw/confluence/pages/viewpage.action?pageId=502" dc:title="入門 10 - Map-backed ActionForm" trackback:ping="http://www.javaworld.com.tw/confluence/rpc/trackback/502"/></rdf:RDF>-->
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