Spring-无法在单元测试中的@Component序列化程序中加载application.yml（在测试类@Value中已正确加载）

Question

我想在我的Spring Boot应用程序（1.5.6）中加载application.yml中配置的时区。 春天是5.0.4。

我在测试类中看到了它：

@Slf4j
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest // to load test application.yml
public class KafkaUserPurchaseDTOTest {
    private static String jsonDataUpdate = "";

    @Value("${time-zone.name}")
    private String timezone;  // <---------- the value is loaded here

    private ObjectMapper mapper;

    @BeforeClass
    public static void prepare() throws IOException {
        InputStream in = KafkaUserPurchaseDTOTest.class.getResourceAsStream("/fixture/kafka-data-user-purchase-update.json");
        jsonDataUpdate = IOUtils.toString(in, Charset.defaultCharset());
    }

    @Test
    public void testConvertJsonToPurchaseDTO() throws IOException {
        // given
        assert !jsonDataUpdate.isEmpty() : "Must load the json file";
        mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); // just take the fields we need
        mapper.configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);
        mapper.setTimeZone(TimeZone.getTimeZone("Europe/Budapest"));
        mapper.configure(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE, true);

        // when
        UserPurchaseDTO dto = mapper.readValue(jsonDataUpdate, UserPurchaseDTO.class);  // <------------ here we enter serializer....
        // then
        Assert.assertNotNull(dto);
        Assert.assertNotNull(dto.getMemberId());
        Assert.assertNotNull(dto.getLastBuyDate());
        // See the example JSON for exact values
        Assert.assertEquals("2018-03-19 09:16:11", DateTimeUtil.formatDateWithMilliPart(dto.getLastBuyDate(), false));
        Assert.assertEquals(790849L, dto.getMemberId().longValue());
    }

    //@Test TODO more test on empty/null values

}

但是在序列化程序中，即使使用@Component注释，也不会加载相同的值。

@Slf4j
@Component
public class KafkaUserPurchaseDeserializer extends StdDeserializer<UserPurchaseDTO> {

    @Value("${time-zone.name}")
    private String timezone;

    public KafkaUserPurchaseDeserializer() {
        this(null);
    }

    public KafkaUserPurchaseDeserializer(Class<?> c) {
        super(c);
    }



    @Override
    public UserPurchaseDTO deserialize(JsonParser parser, DeserializationContext context) throws IOException {
        JsonNode root = parser.getCodec().readTree(parser);
        UserPurchaseDTO dto = new UserPurchaseDTO();
        String Id = root.get(UserPurchaseDTO.JSON_PROP_KAFKA_FK_MEMBER_PK).asText();
        if (StringUtils.hasText(Id)) {
            try {
                dto.setMemberId(Long.parseLong(Id));
            } catch (NumberFormatException e) {
                log.error("Cannot format {} to number", Id, e);
                return null;
            }
        } else {
            log.error("Cannot find  user id for this message: {}", root.toString());
            return null;
        }
        String lastBuy = root.get(UserPurchaseDTO.JSON_PROP_KAFKA_LAST_DATE).textValue();
        if (StringUtils.hasText(lastBuy)) {
            try {
                dto.setLastBuyDate(DateTimeUtil.convertDateToAppConfigTimeZone(timezone, lastBuy, false));   // <----------------- here: timezone = null
            } catch (DateTimeParseException e) {
                log.error("Cannot parse {} to date", lastBuy, e);
                return null;
            }
        } else {
            log.info("User Purchase comes without last buy date. The node has content: {}", lastBuy);
        }
        return dto;
    }
}

为什么？ 他们不在同一上下文中吗？

Answer 1

尝试在您的配置中定义此bean：

@Bean
public PropertySourcesPlaceholderConfigurer configurer(){
        return new PropertySourcesPlaceholderConfigurer();
        }

参考文献： 1 ， 2

Answer 2

现在问了一下，我发现我正在创建另一个ObjectMapper而不是使用Spring上下文的对象。 我停止实例化它，仅使用@Autowired ，它开始起作用。

@Autowired
private ObjectMapper mapper;

我还删除了配置此mapper的部分，因为如果从上下文加载它，则应在application.yml完成。