springboot之属性注入

单个属性注入

application.yml

enterprise:
  env: test

注入单个属性

@Slf4j
@RequestMapping("/test")
@RestController
public class TestController {

    @Value("${enterprise.env}")
    private String env;

    @GetMapping("/doService")
    public void doService() {
        log.info("---------- env = " + env);
    }
}

对象属性注入

application.yml

User:
  username: zhangsan
  age: 23
  birth: 1990-09-12

注入对象属性：

@ToString
@Data
@ConfigurationProperties(prefix = "user")
@Component
public class UserVO {

    private String username;

    private Integer age;

    private String birth;
}

@Slf4j
@RequestMapping("/test")
@RestController
public class TestController {

    @Autowired
    private UserVO userVO;

    @GetMapping("/doService")
    public void doService() {
        log.info("---------- env = " + userVO);
    }
}

属性注入校验

导包：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

@org.springframework.validation.annotation.Validated
@ToString
@Data
@ConfigurationProperties(prefix = "user")
@Component
public class UserVO {

    @javax.validation.constraints.NotEmpty(message = "用户名不能为空")
    private String username;
    @javax.validation.constraints.NotNull(message = "年龄不能为空")
    private Integer age;
    private String birth;
}

说明：这里面的@Validated是必须要有的。

外部属性文件properties注入

user.username=lisi
user.age=25
user.birth=1991-09-12

@ConfigurationProperties(prefix = "user")
@PropertySource("classpath:file/user.properties")
@ToString
@Data
@Component
public class UserVO {

    private String username;
    private Integer age;
    private String birth;
}