
@RestController
@RequestMapping("/books")
public class BookController {
 
    @GetMapping("/{id}")
    public String getById(@PathVariable Integer id){
        System.out.println("id ==> "+id);
        return "hello , spring boot!";
    }
}

引导类


@SpringBootApplication
public class Springboot01QuickstartApplication {
    
    public static void main(String[] args) {
        SpringApplication.run(Springboot01QuickstartApplication.class, args);
    }
}

SpringBoot配置文件

SpringBoot的配置文件application.yml application这个名称不能改变


server:
	port: 82

怎么读取yml文件的配置数据

假如yml文件的数据如下：


lesson: SpringBoot
 
server:
  port: 80
 
enterprise:
  name: itcast
  age: 16
  tel: 4006184000
  subject:
    - Java
    - 前端
    - 大数据

使用 @Value("表达式") 注解可以从配合文件中读取数据，注解中用于读取属性名引用方式是：${一级属性名.二级属性名……}


@RestController
@RequestMapping("/books")
public class BookController {
    
    @Value("${lesson}")
    private String lesson;
    @Value("${server.port}")
    private Integer port;
    @Value("${enterprise.subject[0]}")
    private String subject_00;
 
    @GetMapping("/{id}")
    public String getById(@PathVariable Integer id){
        System.out.println(lesson);
        System.out.println(port);
        System.out.println(subject_00);
        return "hello , spring boot!";
    }
}