將 pom 文件中的 thymeleaf-extras-springsecurity4 依賴改成 thymeleaf-extras-springsecurity5
<dependency> <groupId>org.thymeleaf.extras</groupId> <artifactId>thymeleaf-extras-springsecurity5</artifactId> </dependency>
還要在 HTML 頁面引入約束
<!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>