1. 程式人生 > >有關freemarker的語法,迴圈,邏輯

有關freemarker的語法,迴圈,邏輯

==============常用語法=================
三.
EG.一個物件BOOK
1.輸出 ${book.name}
空值判斷:${book.name?if_exists },
${book.name?default(‘xxx’)}//預設值xxx
${ book.name!"xxx"}//預設值xxx
日期格式:${book.date?string('yyyy-MM-dd')}
數字格式:${book?string.number}--20
${book?string.currency}--<#-- $20.00 -->
${book?string.percent}—<#-- 20% -->
插入布林值:
<#assign foo=ture />
${foo?string("yes","no")} <#-- yes -->

=============邏輯判斷==================
2.
a:
<#if condition>...
<#elseif condit
inc 釋出於2007-09-08 16:18:57 
ion2>...
<#elseif condition3>......
<#else>...
其中空值判斷可以寫成<#if book.name?? >

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


===============迴圈讀取=================
3.
<#list sequence as item>
...
</#list>
空值判斷<#if bookList?size = 0></#list>
e.g.
<#list employees as e>
${e_index}. ${e.name}
</#list>

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

=============用來壓縮空白空間和空白的行===============

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

I said, test only


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

==============Sequence內建的計數器==============

3. Sequence內建的計數器: xxx_index 
用途:顯示序號 
模板:

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

輸出:

1. Readonly 
2. Robbin


==============Sequence內建的分段器=====================
4. Sequence內建的分段器: chunk 
用途:某些比較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>


輸出:

<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使用樣例-List元素為Scalar物件:

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

List使用樣例-List元素為User物件:

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

Map使用樣例-Map Values元素為Scalar :

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

Map使用樣例-Map Values元素為User物件:

<#list userMap?keys as key1>
    <#assign mapUser="${userMap[key1]}" >
    User Object is :${mapUser}
    <#-- 
    以下方法有問題 
    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在模板中定義變數==============

在模板中定義的變數有三種類型:
plain變數:可以在模板的任何地方訪問,包括include指令插入的模板,使用assign指令建立和替換
<#include "/WEB-INF/index/top.html">


==============freemarker.properties配置================
(1)解決輸出中文亂碼問題:
default_encoding=UTF-8
locale=zh_CN 
number_format=#

(2)提高freemarker的效能
template_update_delay=60000

(3)freemarker的標籤種類:
${..} 
# 代表是FTL tags
<#if ...></#if> 
<#list totalList as elementObject>...</#list>
@ ,代表使用者自定義的標籤 
<#-- --> 註釋標籤,注意不是<!-- -->

=====================將圖片整除換行====== <#if (u_index+1)%4=0>當圖片超過五個就換行=======
   <table width="100%">
                      <tr>
                        <td><table width="100%">
                          <tr>
              <#if map["最新-圖片"]?exists>
     <#list map["最新-圖片"] 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}

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

在html靜態頁裡:
<#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>
<#--時間比較-->
<#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">以過期</font>
<#else>
未過期
</#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>