有关freemarker的语法,循环,逻辑

JavaGG 发布于 2009/12/22 20:16
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==============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:

<ul>
<li>a</li>
<li>b</li>
<li>c</li>
<li>d</li>
</ul>
<ul>
<li>e</li>
<li>f</li>
<li>g</li>
<li>h</li>
</ul>
<ul>
<li>i</li>
<li>j</li>
</ul>

<tr>
<td>a</td>
<td>b</td>
<td>c</td>
<td>d</td>
</tr>
<tr>
<td>e</td>
<td>f</td>
<td>g</td>
<td>h</td>
</tr>
<tr>
<td>i</td>
<td>j</td>
<td>-</td>
<td>-</td>
</tr>

 


=====================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>

                    <td align="center" valign="middle" bgcolor="#6F7074">
                    <a target="_blank" href="shownews.page?id=${u.id?default("")}&mole=2 "><img src="${u.chartpath?default('')}" width="67" height="41" border="0" /></a></td>
                  </tr>
                  <tr>
                    <td align="center" bgcolor="#6F7074">
                    <a target="_blank" href="shownews.page?id=${u.id?default("")}&mole=2 " class="tableff">
                    <@jf.greet title=u.title len=4 /></a>
                    </td>
                  </tr>

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

                    <td align="center" valign="middle" bgcolor="#6F7074">
                    <a target="_blank" href="shownews.page?id=${u.id?default("")}&mole=2 "><img src="${u.chartpath?default('')}" width="67" height="41" border="0" /></a></td>
                  </tr>
                  <tr>
                    <td align="center" bgcolor="#6F7074">
                    <a target="_blank" href="shownews.page?id=${u.id?default("")}&mole=2 " class="tableff">
                    <@jf.greet title=u.title len=4 /></a>
                    </td>
                  </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>

加载中
0
JavaGG
JavaGG

无可否认,freemarker的功能非常强大!!

0
红薯
红薯

这些还只是冰山一角哦,FreeMarker还有很多不错的东西,包括可扩展性方面,都非常的强。

0
宋浩
宋浩

珍藏, 希望有更多的freemarker的语法都发来。 以后方便查询

0
h
h363782901

跟楼上的目的一样。现在正在学习freemarker中……

0
f
fireOnLine

thanks  freemarker学习中 受益了

0
jobell
jobell

freemarker对空指针的处理实在是麻烦。

0
杨森
杨森

谢谢,还没看,不过看到上面的那么多人的流言蜚语,我就感觉你小子做了件好事。

0
robertZ
robertZ

不错不错。学习中

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