如何在Struts 2中将两个布尔值与OGNL连接起来？

Question

I have two variables set like this:

<s:set var="A" value="true" />
<s:set var="B" value="false" />

I want to generate the HTML below with a custom attribute info like this :

<td info="truefalse">&#160;</td>

I tried the following lines in my JSP file but I can't get true next to false :

<td info="<s:property value="#A?'true':'false'+#B?'true':'false'""/>&#160;</td>

outputs: <td info="true">&#160;</td>

<td info="<s:property value="#A" /><s:property value="#B" />">&#160;</td>

outputs: <td info="false">&#160;</td>

Answer 1

OGNL uses + to concatenate strings. Having boolean values to convert to string, you should do something like

<s:property value="%{''+#A+#B}"/> 

Answer 2

Use <s:if> Try this

<s:set var="A" value="true" />
<s:set var="B" value="false" />

<td info="<s:if test="%{#A==true}">true</s:if><s:else>false</s:else><s:if test="%{#B==true}">true</s:if><s:else>false</s:else>">&#160;</td>
 OR
<td info="<s:property value="#A" /><s:property value="#B" />">&#160;</td>

outputs:

<td info="truefalse">&#160;</td>

Reason: You can not concatenate Boolean . You need to convert Boolean to string and you can concatenate strings only.

Answer 3

试试这个可能对你有帮助..

<td info="<s:property value="A"></s:property><s:property value="B"></s:property>">&#160;</td>