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配置文件

application.yaml

server:
  servlet:
    context-path: /app  #项目名

controller

//注入到spring容器
@Controller
public class HelloController {

    @GetMapping("hello")
    @ResponseBody
    public String hello(){
        return "Hello,SpringBoot";
    }
}

启动项目

@SpringBootApplication
public class SpringbootDemo1Application {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootDemo1Application.class, args);
    }

}