Thymeleaf整合到Spring Security，标签sec不起作用

将 pom 文件中的 thymeleaf-extras-springsecurity4 依赖改成 thymeleaf-extras-springsecurity5

　　　　　<dependency>

            <groupId>org.thymeleaf.extras</groupId>

            <artifactId>thymeleaf-extras-springsecurity5</artifactId>

        </dependency>

还要在 HTML 页面引入约束

<!DOCTYPE html>

<html xmlns:th="http://www.thymeleaf.org"

      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity5">

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

    <title>Insert title here</title>

</head>

EXTRAS

Thymeleaf整合到Spring Security，标签sec不起作用