今天遇到这么一个问题,我写个文章mark下!!
比如有如下Map类型的数据:
{
"name":"hello",
"poiCodes":[123456,789]
}
在Freemarker模板中这么获取的话:
"poiCodes": <#if inputData.poiCodes?? && (inputData.poiCodes?size > 0)>${inputData.poiCodes}<#else>[]</#if>
会报如下的错误:
"freemarker.core.NonStringException: For "${...}" content: Expected a string or something automatically convertible to string (number, date or boolean), but this has evaluated to a sequence (wrapper: f.t.SimpleSequence)
原因是:Freemarker会将通过key获取的value默认转为string,因此该value是List类型,所以会报错,需要转换处理,步骤比较繁琐,如下:
"poiCodes": <#if inputData.poiCodes?? && (inputData.poiCodes?size > 0)>
[
<#list inputData.poiCodes as poiCode>
${poiCode?c}
<#if poiCode_has_next>
,
</#if>
</#list>
]
<#else>[]</#if>
注:博客来源于https://blog.csdn.net/weixin_37339527/article/details/79000749