​​https://www.thymeleaf.org/​​

引入

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
 </dependency>

把静态文件放入templates文件夹下就可以自动渲染thymeleaf

@RequestMapping("/ok")
    public String abc() {
        return "success";
    }

语法