一、背景

使用easyui框架写from表单时，发送ajax请求，data等于$("#addDialog form").serialize()，提交后结果为400

浏览器控制台信息：

Failed to convert property value of type 'java.lang.String' to required type 、'java.util.Date' for property 
'followOrderStudentVo.followTime';nested exception is org.springframework.core.convert.
ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.util.Date] for value '2018-09-13'; 
nested exception is java.lang.IllegalArgumentException: Parse attempt failed for value [2018-09-13]",
"objectName":"followStudentDto","field":"followOrderStudentVo.followTime",
"rejectedValue":"2018-09-13","bindingFailure":true,"code":"typeMismatch"}],
"message":"Validation failed for object='followStudentDto'. 

二、原因

$(from).serialize()方法将原本的时间框中的Date类型的数据序列化为String类型，后台在自动装配时setter方法的类型不匹配

这里要说下easyui：easyui-datebox和easyui-datetimebox的区别了

easyui-datebox会转为String

easyui-datetimebox会转为Date

三、解决办法

将前端页面中时间框input的class属性easyui-datebox换为easyui-datetimebox就行了