struts2 一个form，多个submit 问题

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sendUI.jsp

<s:form action="sendOrSaveToDraftBox" method="post" namespace="/MessageAction" name="send">
   <s:select label="级别" name="priority" list="#{0:'普通',1:'重要'}" headerKey="-1" headerValue="请选择级别"/>
   <s:select label="收件人" name="receiverId" list="receiversList" multiple="true" listKey="id" listValue="name"/>
   <s:textfield label="标题" name="title" />
   <s:textarea label="消息内容" name="content" cols="50" rows="10" ></s:textarea>
   <s:submit value="发送" method="send"></s:submit>
   <s:submit value="保存草稿" method="saveToDraftBox"></s:submit>
   <s:reset></s:reset>
   </s:form>

struts.xml

<constant name="struts.enable.DynamicMethodInvocation" value="true" />重要

<action name="sendOrSaveToDraftBox" class="cn.itcast.oa.web.action.MessageAction" >
   <result type="redirectAction" name="toOutBox">outBox</result>
   <result type="redirectAction" name="toDraftBox">draftBox</result>
   </action>

MessageAction

/**发送消息*/
public String send() throws Exception {

//......

return "toOutBox";

}

/**保存草稿*/

public String saveToDraftBox() throws Exception {

//......
return "toDraftBox";
}