创建一个SpringBoot项目

pom配置

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.0</version>
    </parent>

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

创建启动类

创建一个类在其实加上@SpringBootApplication注解标识为启动类。

@SpringBootApplication
public class HelloApplication {

    public static void main(String[] args) {
        SpringApplication.run(HelloApplication.class, args);
    }
}

定义Controller

创建Controller,主要Controller要放在启动类所在包或者其子包下。

@RestController
public class HelloController {
    @RequestMapping("/hello")
    public String hello(){
        return "hello";
    }
}