struts2 使用总结详解编程语言

嵌套循环 list中的list

<s:iterator id="list" value="infoList" status="sta"> 
<s:iterator id="info" value=“infoList[#sta.index]"> 
   <p> 
    <a href="/expert/a/${info.infoId }.shtml" title="${info.subject }"> 
    <s:if test="subject.length()>=21"> 
        <s:property value='subject.substring(0,20)'/><b>. . .</b> 
    </s:if>   
    <s:else> 
        ${info.subject } 
    </s:else> 
    </a> 
    <span><s:date name="publicTime" format="yyyy-MM-dd" /> 
   </p> 
</s:iterator> 
</s:iterator>

限制循环次数，取前几条记录

<s:subset source="infoList[#sta.index]" start="0" count= "1" > 
<!-- start 开始 count 显示几条 --> 
    <s:iterator id="info" 
    <p> 
    <a href="/expert/a/${info.infoId }.shtml" title="${info.subject }"> 
    <s:if test="subject.length()>=21"> 
        <s:property value='subject.substring(0,20)'/><b>. . .</b> 
    </s:if> 
        <s:else> 
        ${info.subject } 
    </s:else> 
    </a><span><s:date name="publicTime" format="yyyy-MM-dd" /> 
        </p> 
    </s:iterator> 
</s:subset>

集合list 的长度

<s:property value="list.size"/><br/>   
<s:property value="list.size()"/><br/>   
<s:property value="#request.list.size"/><br/>   
<s:property value="#request.list.size()"/><br/>

判断list是否为空

<s:if test="memExpertList == null || memExpertList.size <= 0"> 
      <tr><td align="center" colspan="3" height="23"><font color="red"> 无相关记录！</font></td></tr> 
</s:if>

struts2截取字符串，超过长度省略号

<s:if test="subject.length()>=21"><s:property value='subject.substring(0,20)'/><b>. . .</b></s:if>    
<s:else>${info.subject }</s:else>

struts2时间格式化

<s:date name="publicTime" format="yyyy-MM-dd HH:mm:ss" />