有关freemarker的语法，循环，逻辑

素颜马尾好姑娘i 2022-07-16 14:50 135阅读 0赞

==============常用语法=================  
三．  
EG.一个对象BOOK  
1.输出 $\{book.name\}  
空值判断：$\{book.name?if\_exists \},  
$\{book.name?default(‘xxx’)\}//默认值xxx  
$\{ book.name!"xxx"\}//默认值xxx  
日期格式：$\{book.date?string('yyyy-MM-dd')\}  
数字格式：$\{book?string.number\}--20  
$\{book?string.currency\}--<\#-- $20.00 -->  
$\{book?string.percent\}—<\#-- 20% -->  
插入布尔值：  
<\#assign foo=ture />  
$\{foo?string("yes","no")\} <\#-- yes -->

=============逻辑判断==================  
2．  
a:  
<\#if condition>...  
<\#elseif condit  
inc 发布于2007-09-08 16:18:57  
ion2>...  
<\#elseif condition3>......  
<\#else>...  
其中空值判断可以写成<\#if book.name?? >

</\#if>  
b:  
<\#switch value>  
<\#case refValue1>  
    ...  
    <\#break>  
<\#case refValue2>  
    ...  
    <\#break>  
...  
<\#case refValueN>  
    ...  
    <\#break>  
<\#default>  
    ...  
</\#switch>

===============循环读取=================  
3．  
<\#list sequence as item>  
...  
</\#list>  
空值判断<\#if bookList?size = 0></\#list>  
e.g.  
<\#list employees as e>  
$\{e\_index\}. $\{e.name\}  
</\#list>

<\#if mole?default(0)!=0>

=============用来压缩空白空间和空白的行===============

用例  
<\#assign x = "    moo    ">  
(<\#compress>  
1 2 3   4    5  
$\{moo\}  
test only

I said, test only

)  
输出  
(1 2 3 4 5  
moo  
test only  
I said, test only)

==============Sequence内置的计数器==============

3. Sequence内置的计数器: xxx\_index  
用途：显示序号  
模板:

<\#list employees as e>  
$\{e\_index\}. $\{e.name\}  
</\#list>

输出:

1. Readonly  
2. Robbin

==============Sequence内置的分段器=====================  
4. Sequence内置的分段器: chunk  
用途：某些比较BT的排版需求  
模板:

<\#assign seq = \['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'\]>  
<\#list seq?chunk(4) as row>  
<ul>  
<li><\#list row as cell>$\{cell\} </\#list></li>  
</ul>  
</\#list>

<\#list seq?chunk(4, '-') as row>  
<tr>  
<td><\#list row as cell>$\{cell\} </\#list></td>  
</tr>  
</\#list>

输出:

=====================freemarker的list================================

Scalar String:$\{scalarString\}     
Scalar Number:$\{scalarNumber\}  
Object is:$\{scalarObject\}

List使用样例-List元素为Scalar对象:

<\#list scalarList as value0>  
    Scalar List值：$\{value0\}  
</\#list>

List使用样例-List元素为User对象:

<\#list userList as listUser>  
    List对象User Id值：$\{listUser.userId\}  
</\#list>

Map使用样例-Map Values元素为Scalar :

<\#list scalarMap?keys as mykey>  
    Scalar Map key is :$\{mykey\}  
    Scalar Map value is:$\{scalarMap\[mykey\]\}  
</\#list>

Map使用样例-Map Values元素为User对象:

<\#list userMap?keys as key1>  
    <\#assign mapUser="$\{userMap\[key1\]\}" >  
    User Object is :$\{mapUser\}  
    <\#--  
    以下方法有问题  
    User is :$\{mapUser.userId\} <br>  
    -->  
</\#list>

==============FreeMarker中list排序==============  
升序：  
<\#list list?sort\_by("time") as v>  
</\#list>  
降序：  
<\#list list?sort\_by("time") as v>  
</\#list>

===============freemarker在模板中定义变量==============

在模板中定义的变量有三种类型：  
plain变量：可以在模板的任何地方访问，包括include指令插入的模板，使用assign指令创建和替换  
<\#include "/WEB-INF/index/top.html">

==============freemarker.properties配置================  
（1）解决输出中文乱码问题：  
default\_encoding=UTF-8  
locale=zh\_CN  
number\_format=\#

（2）提高freemarker的性能  
template\_update\_delay=60000

（3）freemarker的标签种类：  
$\{..\}  
\# 代表是FTL tags  
<\#if ...></\#if>  
<\#list totalList as elementObject>...</\#list>  
@ ,代表用户自定义的标签  
<\#-- --> 注释标签，注意不是

=====================将图片整除换行====== <\#if (u\_index+1)%4=0>当图片超过五个就换行=======  
   <table width="100%">  
                      <tr>  
                        <td><table width="100%">  
                          <tr>  
              <\#if map\["最新-图片"\]?exists>  
     <\#list map\["最新-图片"\] as u>  
     <\#if (u\_index+1)%4=0>  
                <td><table width="70" height="65" border="0" cellpadding="0" cellspacing="0">  
                  <tr>

</table></td></tr><tr >  
     <\#else>  
     <td><table width="70" height="65" border="0" cellpadding="0" cellspacing="0">  
                  <tr>

</table></td>  
     </\#if>  
     </\#list>  
     </\#if>  
              </tr>              
            </table>  
                    </td>  
                  </tr>  
                </table>  
                  </tr>  
                </table></td>  
     </\#if>  
     </\#list>  
     </\#if>  
              </tr>              
            </table>  
                    </td>  
                  </tr>  
                </table>

===============================freemarker中在application  
$\{Application.web\_title\}

在类里：  
list=dser.indexvideo(cvo);  
if(list.size()!=0)\{  
map.put("最新",list);\}

在html静态页里：  
<\#import "/WEB-INF/ftl/index.ftl" as jf>  
（index.ftl  
<\#macro greet title len>  
<\#if title?length != 0>  
<\#if (title?length>len)>  
$\{title\[0..len-1\]\} <\#else>  
$\{title?trim\}  
</\#if>  
<\#else>  
$\{title?default("")\}  
</\#if>  
</\#macro>  
<\#--时间比较-->  
<\#macro vstime start end>  
<\#if start?default("")==""||end?default("")=="">  
\--  
<\#else>  
<\#assign starts=start?replace("-","") >  
<\#assign ends=end?replace("-","") >  
<\#if (starts?number>ends?number)>  
<font color="red">以过期</font>  
<\#else>  
未过期  
</\#if>  
</\#if>  
</\#macro>  
）

<\#if map\["最新"\]?exists>  
<\#list map\["最新"\] as u>  
$\{u.filepath?default('')\}  
<@jf.greet title=u.title len=6 />  
</\#list></\#if>