<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    @RequestMapping("/hello")
        @ResponseBody
        public String hello(){
            return "hello";
        }

    <!-- 使用thymeleaf 模板 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <!--thymeleaf标签不完整报错解决方案-->
    <dependency>
        <groupId>net.sourceforge.nekohtml</groupId>
        <artifactId>nekohtml</artifactId>
    </dependency>        

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional>
    </dependency>
    
    如果不成功可以修改idea配置试试，操作指示如下
    https://blog.csdn.net/little_skeleton/article/details/80935794

    <!-- 添加mybatis 依赖 -->
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.3.0</version>
    </dependency>

    <!-- 驱动 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.15</version>
    </dependency>

    <!--连接池-->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.29</version>
    </dependency>                
    
    注意在项目启动加注解
    @MapperScan("com.emotte.springboot_test.mapper")
    
    其他可查看项目resource下mybatis文件夹和com.emotte.springboot_test.mapper下的mapper
    配置文件中mybatis相关的配置

    <!--发送邮件-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-mail</artifactId>
    </dependency>        
    
    查看service下的MailService，配置文件，test下的MailServiceTest

    <!--redis-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>

    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-pool2</artifactId>
        <version>2.5.0</version>
    </dependency>

    <!-- 将作为Redis对象序列化器 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.47</version>
    </dependency>
    
    查看com.emotte.springboot_test.config下redis的配置
    配置文件中redistribution
    test下的SpringbootRedisApplicationTests