<s:if test=????>怎样取到空值啊??
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<s:if test=%{a==null}>
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- Java code
<s:if test="%{stuSex==0}">男</s:if><s:else>女</s:else>
<s:if test="%{stuSex==0}">男</s:if><s:else>女</s:else>