学习 Spring Quickstart Guide 时，启动 mvnw spring-boot:run 后报错

https://spring.io/quickstart

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project
 demo: Compilation failure: Compilation failure:
[ERROR] /D:/testws/test/java/springBoot/demo1/src/main/java/com/example/demo/DemoApplication.java:[4,47] 程序包org.springframework.web.bind.annotation不存在
[ERROR] /D:/testws/test/java/springBoot/demo1/src/main/java/com/example/demo/DemoApplication.java:[5,47] 程序包org.springframework.web.bind.annotation不存在
[ERROR] /D:/testws/test/java/springBoot/demo1/src/main/java/com/example/demo/DemoApplication.java:[6,47] 程序包org.springframework.web.bind.annotation不存在
[ERROR] /D:/testws/test/java/springBoot/demo1/src/main/java/com/example/demo/DemoApplication.java:[9,2] 找不到符号
[ERROR]   符号: 类 RestController
[ERROR] /D:/testws/test/java/springBoot/demo1/src/main/java/com/example/demo/DemoApplication.java:[18,30] 找不到符号
[ERROR]   符号:   类 RequestParam
[ERROR]   位置: 类 com.example.demo.DemoApplication
[ERROR] /D:/testws/test/java/springBoot/demo1/src/main/java/com/example/demo/DemoApplication.java:[17,10] 找不到符号
[ERROR]   符号:   类 GetMapping
[ERROR]   位置: 类 com.example.demo.DemoApplication
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

解决：
pom.xml 添加依赖

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