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velocity 模板能够对数值进行formate，现在有个需求是希望能够小数点保留两位，
坑爹的文档，就给了最基本的用法，还是我大stackoverflow威武，一查一个准：
上代码：
$number.format("#0.00", $val) 附原文： ************************************************
I want to convert
23.59004 to 23.59
35.7 to 35.70
3.0 to 3.00
9 to 9.00
Please tell me how can I do it in velocity template? I searched a lot for this and found that I can use velocity tools, but there are no examples related to it? and can i use velocity tools in templates?
answer：Velocity tools are expected to be used in Velocity templates; essentially they are objects added to the variables available in a template so that you can use $numberTool.format("#0.00", $val) or similar. If none of the available tools don't fit your needs, simply create a POJO and add it to the template.
参考：
官方文档：
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