FreeMarker学习

1：${…}     ：取值

${errorMsg!""}

2：!"默认值"    ：默认值

1的默认值为空字符

3：？？ 判断是否存在

(USER_CONTEXT.userName)??  将判断USER_CONTEXT和USER_CONTEXT.userName是否存在null

USER_CONTEXT.userName??  将判断USER_CONTEXT.userName是否存在null

4：if 指令

<#if (USER_CONTEXT.userType)?? &&(USER_CONTEXT.userType == 2)> 

</#if>

if    else 指令

<#if (USER_CONTEXT.userName)??>
   ${USER_CONTEXT.userName},欢迎您的到来,<a href="/forum/login/doLogout.html">注销</a>
<#else>
   <a href="/forum/logini.html">登录</a>
   <a href="/forum/register.html">注册</a>
</#if>

5:list指令

<#list boards as board>

  <tr>
   <td><a href="/forum/board/listBoardTopics-${board.boardId}.html">${board.boardName}</a></td>
   <td>${board.boardDesc}</td>
   <td>${board.topicNum}</td>
  </tr>

 </#list>

 6：日期格式化

${createTime?string('yyyy-MM-dd HH:mm')