Spring Boot学习05YAML数据配置与使用

定义application.yml文件：

# 定义变量
name: abc

#引用变量
myname: ${name}

#对象的写法
person:
  name: zhangsan
  age: 20
  address:
    - beijing
    - shanghai

#对象的行内写法
person2: {name: lisi, age: 18}

#数组的写法
address:
  - beijing
  - shanghai

# 数组的行内写法
address2: [guangzhou, shenzhen]

#字符串:不会识别转义字符
msg1: 'hello \n world'

#字符串：自动识别转义字符
msg2: "hello \n world"

读取信息的方式：

@Slf4j
@RestController
public class IndexController {

    @Value("${name}")
    private String Name;

    @Value("${person.name}")
    private String Name2;

    @Value("${address[0]}")
    private String Address;

    @Value("${msg1}")
    private String Msg1;

    @Value("${msg2}")
    private String Msg2;

    @Autowired
    private Environment environment;

    @Autowired
    private Person person;

    @RequestMapping("/")
    public String Index(){

        log.info("hello world");
        return "hello world spring boot";
    }

    @RequestMapping("/read")
    public String Read(){
        System.out.println(this.Name);
        System.out.println(this.Name2);
        System.out.println(this.Address);
        System.out.println(this.Msg1);
        System.out.println(this.Msg2);

        System.out.println("---------------------");

        System.out.println(environment.getProperty("person2.age"));
        System.out.println(environment.getProperty("address2[1]"));

        System.out.println("----------------------");

        System.out.println(person.toString());
        return "";
    }
}

使用ConfigurationProperties将yml文件中的一个节绑定到对象上：

@Data
@ToString
@NoArgsConstructor
@AllArgsConstructor
@Component
@ConfigurationProperties("person")
public class Person {
    private String Name;
    private Integer Age;
    private String[] Address;
}