application.yml
server:
  port: 8888
name: abc
#1.对象(map)键值对的集合
person:
  name: xiaozhi #${name}
  age: 24
  address:
    - beijing
    - shanghai
#行内写法
person2: [name: xiaozhi2,age: 24Two]
#2.数组
address:
  - beijing
  - shanghai
#行内写法
address2: [beijing2,shanghai2]
#3.纯量
msg1: 'hello \n word'
msg2: "hello \n word"

@SuppressWarnings("all")
@RestController
public class HelloController {

    /*1.value*/
    @Value("${name}")
    private String name;
    @Value("${person.name}")
    private String name2;
    @Value("${address[0]}")
    private String address1;
    @Value("${msg1}")
    private String msg1;
    @Value("${msg2}")
    private String msg2;

    /*2.Environment*/
    @Autowired
    private Environment env;

    /*3.ConfigurationProperties*/
    @Autowired
    private Person person;
    @GetMapping("/hello")
    public String hello(){
        /*name abc*/
        System.out.println(name);
        /*person name abc*/
        System.out.println(name2);
        /*address[0] beijing*/
        System.out.println(address1);
        /*msg1 ''  hello \n word*/
        System.out.println(msg1);
        /*msg2 ""*/
        /**
        hello
         word
        */
        System.out.println(msg2);
        System.out.println("-------");
        /*xiaozhi*/
        System.out.println(env.getProperty("person.name"));
        /*shanghai*/
        System.out.println(env.getProperty("address[1]"));

        /*3.ConfigurationProperties(prefix="")*/
        System.out.println(person);
        /*address*/
        String[] address = person.getAddress();
        for (String s : address) {
            System.out.println(s);
        }
        return "HelloSpringBoot";
    }
 }