freemarker 学习（二）

二．环境搭建与配置

<!—freemarker初始配置-->

 

<servlet>

<servlet-name>freemarker</servlet-name>

<servlet-class>freemarker.ext.servlet.FreemarkerServlet</servlet-class>

<init-param>

<param-name>TemplatePath</param-name>

<param-value>/</param-value>

</init-param>

<init-param>

<param-name>NoCache</param-name>

<param-value>true</param-value>

</init-param>

<init-param>

<param-name>ContentType</param-name>

<param-value>text/html</param-value>

</init-param>

<init-param>

<param-name>template_update_delay</param-name>

<param-value>0</param-value>

</init-param>

<init-param>

<param-name>default_encoding</param-name>

<param-value>GBK</param-value>

</init-param>

<init-param>

<param-name>locale</param-name>

<param-value>zh_CN </param-value>

</init-param>

<init-param>

<param-name>number_format</param-name>

<param-value>0.##########</param-value>

</init-param>

<load-on-startup>2</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>action</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

<servlet-mapping>

<servlet-name>freemarker</servlet-name>

<url-pattern>*.ftl</url-pattern>

</servlet-mapping>

 

----------------------------------------------------------------------------

三．常用语法

 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 -->

 

 

 

 

2．逻辑判断

a:
<#if condition>...

<#elseif condition2>...

<#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>

 

3．循环读取

<#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>
输出:

1. Readonly
2. Robbin