技术资料: http://www.ibm.com/developerworks/cn/java/j-lo-freemarker/
FM 解析hash序列 output[name = mouse; price = 50]
<#assign h = {"name":"mouse", "price":50}>
<#assign keys = h?keys>
<#list keys as key>${key} = ${h[key]}; </#list>
<#assign h = {"name":"mouse", "price":50}>
<#assign keys = h?keys>
<#list keys as key>${key} = ${h[key]}; </#list>