<s:if>标签比较字符串

JScript code

             <s:property value = "#session.WW_TRANS_I18N_LOCALE"/>
             <s:if test = "#session.WW_TRANS_I18N_LOCALE == 'zh_TW'">aaa</s:if>
             <s:if test = '#session.WW_TRANS_I18N_LOCALE == "zh_CN"'>bbb</s:if>
             <s:if test = '#session.WW_TRANS_I18N_LOCALE == "en_US"'>ccc</s:if>

以上是在jsp中写的，显示的结果是 s:property 的结果可以显示正常，如 zh_TW,
但是后面的aaa，bbb，ccc 都没反应，

请问大侠们怎么写可以正常的比较字符串？

------解决方案--------------------
==换成eq呢？
------解决方案--------------------
<s:if test = "#session.WW_TRANS_I18N_LOCALE == zh_TW">aaa</s:if>


这样试试
------解决方案--------------------
<s:if test="%{#branch.branchUid eq buyBranchUids}">selected</s:if>


看看这个行不