现在的intellij idea2017最新版似乎还是不支持thymeleaf模板文件关于属性的自动补全，在官网论坛对于支持thymeleaf补全有一个讨论，但是似乎现在还没有好的解决方法。

Unfortunately this bug is the result of multiple interdependent problems (Spring Boot autoconfig model, upgrade/extension of existing Spring MVC ), each of which needs to be adressed in order to make this fully working. We're working towards a solution for 2016.x and will make results available in Early Access Program ASAP. Thanks for your understanding.