org.thymeleaf.exceptions.TemplateInputException
org.thymeleaf.exceptions.TemplateInputException: Error resolving template "Hello", template might not exist or might not be accessible by any of the configured Template Resolvers
因为springboot 是2.0版本的,thymeleaf是3.0版本的,可能是版本之间的冲突,把springboot改成1.5版本,问题解决