为什么消息转换器不使用对象映射器日期 fromat 进行日期转换? [英] why is the Object Mapper date fromat not used by message converters for date transform?

问题描述

我遇到了 JSON 的自定义日期格式问题，它当然可以在测试中运行，但在部署的应用程序中失败.我想使用日期模式作为 dd-MM-yyyy 几乎标准以及它在印度的预期方式.还配置了一个日期格式化程序，并像这样注入配置

I am facing an issue with customised date formatting for JSON, where it of-course works in tests but fails on the deployed application. I want to use date pattern as dd-MM-yyyy pretty much standard and how it is expected here in India. There is a date formatter configured as well, and injected in the configuration like so

@Configuration
public class RepositoryWebConfiguration extends RepositoryRestMvcConfiguration {

private static final Logger LOGGER = LoggerFactory.getLogger(RepositoryWebConfiguration.class);

  @Override
  public void configureJacksonObjectMapper(ObjectMapper objectMapper) {
    LOGGER
    .debug("Configuring dd-MM-yyyy as default date pattern for all JSON representations in Rest DATA Repositories");
    Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
    builder.indentOutput(true).dateFormat(new SimpleDateFormat("dd-MM-yyyy"));
    objectMapper = builder.build();
  }
}

现在这应该适用于 JSON，因为我正在注入特定的日期格式，在我的测试中，我首先创建了一个具有相同格式的映射器

Now this should work for JSON since I am injecting a specific date formatting, in my tests I first create a mapper with the same format

  private ObjectMapper halObjectMapper() {
    Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
    builder.indentOutput(true).dateFormat(new SimpleDateFormat("dd-MM-yyyy"));
    ObjectMapper objectMapper = builder.build();
    objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    objectMapper.registerModule(new Jackson2HalModule());
    return objectMapper;
  }

然后我使用这个映射器为 POST 请求生成 JSON.JSON 生成一切正常，我期望 dd-MM-yyyy 格式，我得到了

I then use this mapper to generate the JSON for POST request. The JSON is generated all fine, I expected the format dd-MM-yyyy and I get exactly that

{
  "id":null,
  "name":"KABADI",
  "seatsAvailable":40,
  "workshopType":"KABADI FOUNDATION",
  "date":"16-08-2015",
  "venue":"http://localhost:8080/venues/2"
}

注册了 ObjectMapper 后，我希望这个 JSON 可以毫无问题地转换为 Workshop 对象 &日期格式为 dd-MM-yyyy.但是，由于格式异常，POST 请求失败，Jackson 抱怨说它无法将 dd-MM-yyyy 转换为 Date，因为可用格式为 "仅

With the ObjectMapper registered I expect this JSON to be transformed to Workshop object without any issues & with the date format dd-MM-yyyy. However, the POST request fails due to format exception, and Jackson complains it cannot transform dd-MM-yyyy to Date as the available formats are "only"

("yyyy-MM-dd'T'HH:mm:ss.SSSZ", "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "EEE,dd MMM yyyy HH:mm:ss zzz", "yyyy-MM-dd")

("yyyy-MM-dd'T'HH:mm:ss.SSSZ", "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "EEE, dd MMM yyyy HH:mm:ss zzz", "yyyy-MM-dd")

这是日志

Caused by: com.fasterxml.jackson.databind.exc.InvalidFormatException: Can not construct instance of java.util.Date from String value '16-08-2015': not a valid representation (error: Failed to parse Date value '16-08-2015': Can not parse date "16-08-2015": not compatible with any of standard forms ("yyyy-MM-dd'T'HH:mm:ss.SSSZ", "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "EEE, dd MMM yyyy HH:mm:ss zzz", "yyyy-MM-dd"))
 at [Source: HttpInputOverHTTP@54153158; line: 5, column: 53] (through reference chain: com.agilityroots.doi.workshop.entity.Workshop["date"])
  at com.fasterxml.jackson.databind.exc.InvalidFormatException.from(InvalidFormatException.java:55)
  at com.fasterxml.jackson.databind.DeserializationContext.weirdStringException(DeserializationContext.java:810)
  at com.fasterxml.jackson.databind.deser.std.StdDeserializer._parseDate(StdDeserializer.java:740)
  at com.fasterxml.jackson.databind.deser.std.DateDeserializers$DateBasedDeserializer._parseDate(DateDeserializers.java:176)
  at com.fasterxml.jackson.databind.deser.std.DateDeserializers$DateDeserializer.deserialize(DateDeserializers.java:262)
  at com.fasterxml.jackson.databind.deser.std.DateDeserializers$DateDeserializer.deserialize(DateDeserializers.java:246)
  at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:538)
  at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:99)
  at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:238)
  at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:118)
  at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3066)
  at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2221)
  at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:205)
  ... 46 common frames omitted

不必像在通常的 Spring WebMVC + Boot 场景中那样更早地查看这些覆盖，这个属性用于解决问题

never had to look too much into these overrides earlier as in the usual Spring WebMVC + Boot scenario, this property used to the do the trick

spring.jackson.date-format=dd-MM-yyyy

spring.jackson.date-format=dd-MM-yyyy

所以我可能在这里遗漏了一些东西，或者我以错误的方式配置了 objectMapper，因为它没有被注入?如何让 JSON 转换器接受 dd-MM-yyyy 格式?

So I might as well be missing something here, or I am configuring objectMapper in the wrong way in the sense that it is not injected? How can I get JSON transformers to accept dd-MM-yyyy format?

推荐答案

做的太多了，暂时解决了这个问题.JSON 对象仍然不是 dd-MM-yyyy 格式，被解释为一个单独的日期，例如 16-08-2015 返回为 February X in 22 将调查那个

Was doing too much, this fixed the test for now. Object to JSON is still not in dd-MM-yyyy format, gets interpreted as a separate date for example 16-08-2015 returns as February X in 22 will look into that

  @Override
  public void configureJacksonObjectMapper(ObjectMapper objectMapper) {

    objectMapper.setDateFormat(new SimpleDateFormat("dd-MM-yyyy"));
  }

更新:

另一个问题是使用 @Temporal(TemporalType.DATE) 注释 Workshop 中的日期字段，导致日期保存为 2015-08-16，已删除那个注释也是.

The other problem was annotation the date field in Workshop with @Temporal(TemporalType.DATE) which caused the date to be saved as 2015-08-16, removed that annotation too.

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