Error resolving template [index], template might not exist or might not be accessible by any of the configured Template Resolvers

springboot 整合  html 页面，无法加载到 .html 页面。

错误描述

[2020-09-29 14:01:37.541] [http-nio-8888-exec-1] [ERROR][org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet]] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateInputException: Error resolving template [index], template might not exist or might not be accessible by any of the configured Template Resolvers] with root cause
org.thymeleaf.exceptions.TemplateInputException: Error resolving template [index], template might not exist or might not be accessible by any of the configured Template Resolvers

1.maven 依赖

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

2.application.properties 配置

server.port=8888
spring.mvc.view.prefix=/templates/
spring.mvc.view.suffix=.html

 3.代码实现

    @GetMapping("/index")
    public String index() {
        return "index";
    }

4.文件结构

解决方案：

确定自己的pom.xml文件中是否添加resources插件,若是没有进行以下步骤检查

解决办法：
1.检查controller中的注解：@RestController是@ResponseBody和@Controller的组合这个注解，返回html页面时应该使用@Controller注解。
2.检查return中的字符串是否有错误(注意没有 ‘/’ 字符)
3.检查html页面是否存在
4.html文件是否存在templates目录下，若是存在自定义的目录下则需要配置

若是有resources插件,配置如下

解决办法：
检查自己的resource标签中是否加入了以html为后缀的资源文件

            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.xml</include>
                    <include>META-INF/app.properties</include>
                    <include>application.properties</include> // 加入配置文件
                    <include>**/*.html</include> //加入 html 文件
                </includes>
                <filtering>true</filtering>
            </resource>

最后重新 update 一下项目即可。