如何在注释中使用 Spring 变量？

Question

如何在不在 class 范围内的注释中获取我的 spring 配置变量之一？目前，我正在这样做：

@Data
@RedisHash(value = "MyEntity", timeToLive = 604800 )
public class MyEntity{
    private String id;
    private String name;
}

但我真正想做的是这个（或类似的东西）：

@Data
@RedisHash(value = "MyEntity", timeToLive = @Value("${spring.redis.expire}") )
public class MyEntity{
    private String id;
    private String name;
}

任何允许我在我的注释中访问我的 application.yml 中的配置变量的解决方案（在这种情况下，完成我的 @RedisHash 注释的值）？？？

Answer 1

我想这应该可行。使用不带@Value 注释的属性。

@RedisHash(value = "MyEntity", timeToLive = "${spring.redis.expire}" )
public class MyEntity{
    private String id;
    private String name;
}

Answer 2

事实证明，您可以通过在 @RedisHash 注释实体 class 中使用 @TimeToLive 注释来分配可配置的过期值。就我而言，它看起来像这样：

@Data
@RedisHash(value = "MyEntity" )
public class MyEntity{
    private String id;
    private String name;

    @TimeToLive
    private Long expiration;
}

然后在使用 redis 实体的实现中，您只需分配该过期值 [myEntity.setExpiration(expiration);]，如以下代码所示：

@Service
@RequiredArgsConstructor
@Slf4j
public class MyEntities {

    private final EntityRepository entityRepository;
    private boolean redisRepoIsHealthy = true;

    @Value("${spring.redis.expire}")
    private long expiration;

. . . . .
. . . . .
. . . . .
. . . . .

    private MyEntity saveEntityToRedisRepo(String userId, String name) {
        MyEntity myEntity = null;
        try {
                myEntity = new MyEntity();
                myEntity.setId(userId);
                myEntity.setAuthorities(name);
                myEntity.setExpiration(expiration);
                entityRepository.save(myEntity);
            }
        } catch (RuntimeException ex)  {
            // user is already saved in redis, so just swallow this failure
            if (redisRepoIsHealthy) {
                log.info("User {} already exists. Could not be saved.", userId);
                log.info("An error occurred ", ex);
            } else {
                log.info("The redis repo is corrupt. The user {} could not be saved.", userId);
            }
        }
        return myEntity;
    }

如何在注释中使用 Spring 变量？

How Can I use a Spring Variable Inside of an annotation?

java

spring

annotations

redis