<html lang="en" xmlns:th="http://www.thymeleaf.org"
xmlns:sec="http://www.thymeleaf.org/extras/spring-security"
xmlns:shiro="http://www.pollix.at/thymeleaf/shiro">
- thymeleaf约束
xmlns:th=“http://www.thymeleaf.org” - security约束
xmlns:sec=“http://www.thymeleaf.org/extras/spring-security” - shiro约束
xmlns:shiro=“http://www.pollix.at/thymeleaf/shiro”