如何将此行从 Velocity 转换为 FreeMarker？

Question

我想将此行从 Velocity 转换为 Freemarker：

#set ($valid_portlet_description = $validator.isNotNull($portlet_description) 
&& $portlet_description.indexOf('javax.portlet.description') == -1)

我尝试将代码更改为：

<#assign valid_portlet_description = validator.isNotNull(portlet_description) 
&& portlet_description?index_of("javax.portlet.description") == "-1" />

但我收到以下错误：

freemarker.template.TemplateException: The only legal comparisons are between two numbers, two strings, or two dates. Left hand operand is a freemarker.template.SimpleNumber Right hand operand is a freemarker.template.SimpleScalar

Answer 1

留言投诉此说法：

portlet_description?index_of("javax.portlet.description") == "-1"

它说你有不同的类型：左边的数字，右边的 SimpleScalar（在 Freemarker 术语中就是 String）。要解决此问题，您只需删除引号：

portlet_description?index_of("javax.portlet.description") == -1

如何将此行从 Velocity 转换为 FreeMarker？

How to convert this line from Velocity to FreeMarker?

java

velocity

freemarker