Spring @Value如何通过${}、#{}注入不同类型的值

//在指定的配置路径后面加冒号，在冒号后面给定默认值
@Value("${constants.test:hello}")

constants:
  test:
    string: test
    integer: 3
    list: a,b,c
    other: a.b.c
    map: "{key1:'var1', key2:'var2'}"

@Value("${constants.test.string:test}")
private String value;

@Value("#{'test'}")
private String value;

@Value("${constants.test.integer:3}")
private Integer value;

@Value("#{3}")
private Integer value;

@Value("${constants.test.list:var1,var2,var3}")
private List<String> sList;

@Value("#{'${constants.test.other}'.split('.')}")
private List<String> sList;

@Value("#{${constants.test.map}}")
private Map<String, Object> map;

@Configuration
public class Config {
	@Bean("myRestTemplate")
	public RestTemplate restTemplate() {
		return new RestTemplateBuilder().build();
	}
}

@Value("#{myRestTemplate}")
private RestTemplate restTemplate;

@Value("${constants.test.string}")
private static String value;

private static String value;

@Value("${constants.test.string}")
public void setValue(String value) {
	this.value = value;
}