@Value

注意，bean 必须被 Spring 管理 @Value 才能生效

用法一：给 bean 的属性注入值

@Data
@Component
public class User {
    @Value("38fysd9fhihrh9")
    private String id;
    @Value("Mario")
    private String name;
    // 性别 1:男，0:女
    @Value("1")
    private int gender;
    private Date birthday = new Date();
    @Value("false")
    private boolean isStudent;
}

用法二：获取 properties 文件的值

# application.properties
server.port=8080
 
# application.yml
server:
    port: 8080

@Component
public class Config{
    @Value("${server.port}")
    private String port;
}