五岁儿童耳朵疼怎么办:freemaker学习笔记

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freemaker学习笔记--其它内置方法 一:数字型
<#assign answer=42/>
${answer}
${answer?string}  <#-- the same as ${answer} -->
${answer?string.number}
${answer?string.currency}
${answer?string.percent}

<#setting number_format="0.###E0"/>

${12345?string("0.####E0")}  


${answer?string("number")} 等同于:${answer?string.number}.

二:日期型:
预定义格式包括:short ,middle和long。

${openingTime?string.short}${openingTime?string.medium}${openingTime?string.long}
组合使用:${lastUpdated?string.short_long}
${lastUpdated?string("yyyy-MM-dd HH:mm:ss zzzz")}

三:逻辑型
foo?string
foo?string("yes", "no")

四:序列的内置方法:
first

last

seq_contains
${x?seq_contains("blue")?string("yes", "no")}

seq_index_of

seq_last_index_of

reverse

size

sort

sort_by
多层次的hash排序

<#assign members = [
    {"name": {"first": "Joe", "last": "Smith"}, "age": 40},
    {"name": {"first": "Fred", "last": "Crooger"}, "age": 35},
    {"name": {"first": "Amanda", "last": "Fox"}, "age": 25}]>
Sorted by name.last:
<#list members?sort_by(['name', 'last']) as m>
- ${m.name.last}, ${m.name.first}: ${m.age} years old
 

chunk:将一个序列分解成几个序列。

<#assign seq = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']>

<#list seq?chunk(4) as row>
  <#list row as cell>${cell}


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

chunk经常用于分栏或者表格输出的格式。

五:hash内置方法:

keys:
values:

六:很少使用或者专家级的内置方法:
byte,double,float,int,long,short。

eval

has_content:变量存在,不是指null也不是空串,一般情况下可以使用expr!?size > 0 or expr!?length > 0 代替expr?has_content

interpret将一个字符串解析为ftl模版,产生一个TemplateTransformModel对象。
<#assign x=["a", "b", "c"]>
<#assign templateSource = "<#list x as y>${y}">
<#assign inlineTemplate = templateSource?interpret>
<@inlineTemplate>def/@inlineTemplate

is_...检查变量类型:

Built-in

Returns true if the value is a ...

is_string

string

is_number

number

is_boolean

boolean

is_date

date (all types: date-only, time-only and date-time)

is_method

method

is_transform

transform

is_macro

macro

is_hash

hash

is_hash_ex

extended hash (i.e. supports ?keys and ?values)

is_sequence

sequence

is_collection

collection

is_enumerable

sequence or collection

is_indexable

sequence

is_directive

macro or transform

is_node

node


namespace:返回宏变量的命名空间,只能用于宏。

new:创建一个TemplateModel实现的变量。
<#assign word_wrapp = "com.acmee.freemarker.WordWrapperTransform"?new()>