struts2中if标签中字符串比较的正确写法
错误写法：

<s:if test="aStringProperty == 'A'">  Why doesn't this work when myString is equal to A?</s:if>

<s:if test='aStringProperty == "A"'>  This works!</s:if><s:if test="aStringProperty == \"A\"">  This works too!</s:if>