/**
 * @Author tou tou
 * @Date 2023/1/15
 * @Des 脱敏类型及策略，不同的字段类型适配不同的策略
 */
public enum SensitivityEnum {
    /**
     * 用户名
     */
    USERNAME(s -> s.replaceAll("\\S*(\\S)", "***$1")),
    /**
     * 身份证
     */
    ID_CARD(s -> s.replaceAll("(\\d{4})\\d{10}(\\w{4})", "$1****$2")),
    /**
     * 手机号
     */
    PHONE(s -> s.replaceAll("(\\d{3})\\d{4}(\\d{4})", "$1****$2")),
    /**
     * 地址
     */
    ADDRESS(s -> s.replaceAll("(\\S{3})\\S{2}(\\S*)\\S{2}", "$1****$2****"));


    private final Function<String, String> desensitizer;

    SensitivityEnum(Function<String, String> desensitizer) {
        this.desensitizer = desensitizer;
    }

    public Function<String, String> desensitizer() {
        return desensitizer;
    }
}

/**
 * @Author tou tou
 * @Date 2023/1/15
 * @Des
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
@JacksonAnnotationsInside
@JsonSerialize(using = SensitivitySerializer.class)
public @interface Sensitivity {
    SensitivityEnum strategy();
}

/**
 * @Author tou tou
 * @Date 2023/1/15
 * @Des
 */
public class SensitivitySerializer extends JsonSerializer<String> implements ContextualSerializer {
    private SensitivityEnum sensitivityEnum;

    @Override
    public void serialize(String value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        gen.writeString(sensitivityEnum.desensitizer().apply(value));
    }

    @Override
    public JsonSerializer<?> createContextual(SerializerProvider prov, BeanProperty property) throws JsonMappingException {

        Sensitivity annotation = property.getAnnotation(Sensitivity.class);
        if (Objects.nonNull(annotation)&&Objects.equals(String.class, property.getType().getRawClass())) {
            this.sensitivityEnum = annotation.strategy();
            return this;
        }

        return prov.findValueSerializer(property.getType(), property);
    }
}

public class UserAccountVO {
    private Integer id;

    @Sensitivity(strategy = SensitivityEnum.USERNAME)
    private String username;

    private Integer age;

    @Sensitivity(strategy = SensitivityEnum.PHONE)
    private String tel;

    private String email;

    private String account;
}

create table useraccount
(
id INT(11),
username NVARCHAR(25),
age INT(11),
phone bigint,
email VARCHAR(80),
account VARCHAR(20),
pwd VARCHAR(20)
);

select * from useraccount;
insert into useraccount values(1,'张老三', 22, 13555551111,'13555551111@126.com','z13555551111', '13555551111');

/**
 * @author toutou
 * @date by 2019/07
 */
@RestController
public class UserController {

    @Autowired
    UserAccountService userAccountService;
    
    @GetMapping("/user/getuser")
    public Result getUserAccountById(@RequestParam("uid") int id){
        UserAccountVO user = userAccountService.getUserAccountById(id);
        if(user != null){
            return Result.setSuccessResult(user);
        }else{
            return Result.setErrorResult(404, "用户不存在");
        }
    }
}