SpringBoot整合Freemarker（二）

if分支

语法：

<#if condition>
  ...
<#elseif condition2>
  ...
<#elseif condition3>
  ...
<#else>
  ...
</#if>

例子：

<#if x = 1>
  x is 1
</#if>
---------------------------------
<#if x = 1>
  x is 1
<#else>
  x is not 1
</#if>

switch分支

语法：

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

例子：

<#switch cloth.size>  // 这里的变量类型可以是字符串也可是整数
  <#case "small">
          This will be processed if it is small
          <#break>
  <#case "medium">
          This will be processed if it is medium
          <#break>
  <#case "large">
          This will be processed if it is large
          <#break>
  <#default>
          This will be processed if it is neither
</#switch>

list循环

<#list sequence as item>
...
<#if item = "spring"><#break></#if>
...
</#list>

例子：

<#assign seq = ["winter", "spring", "summer", "autumn"]> // assign 定义一个变量，这里定义了一个数组
<#list seq as x>   // list循环遍历这个数组
      ${x_index + 1}. ${x}<#if x_has_next>,</#if>
</#list>

关键字：

item_index:是list当前值的下标，从0开始

item_has_next:判断list是否还有值

macro, nested, return

语法

<#macro name param1 param2 ... paramN> 
  ...
  <#nested loopvar1, loopvar2, ..., loopvarN>  //有了这和标签：调用宏的时候，必须用双标签
  ...
  <#return>
  ...
</#macro>

用例

<#macro test foo bar="Bar"  baaz=-1>
  Test text, and the params: ${foo}, ${bar}, ${baaz}
</#macro>

<@test foo="a" bar="b" baaz=5*5-2/>
<@test foo="a" bar="b"/>
<@test foo="a" baaz=5*5-2/>
<@test foo="a"/> 
输出
  Test text, and the params: a, b, 23
  Test text, and the params: a, b, -1
  Test text, and the params: a, Bar, 23
  Test text, and the params: a, Bar, -1