设置Jackson功能WRITE_DATES_AS_TIMESTAMPS无法在Spring Boot中运行 [英] Setting Jackson feature WRITE_DATES_AS_TIMESTAMPS not working in Spring Boot

问题描述

我在Spring Boot配置中设置 spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS = false 但Jackson序列化程序仍然生成 [1942,4,2 ] 代替1942-04-02获取 DateTime 值。

I set spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS=false in the Spring Boot config but the Jackson serializer still produces [1942,4,2] instead of "1942-04-02" for a DateTime value.

一些调试快照

• 在 org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration.Jackson2ObjectMapperBuilderCustomizerConfiguration.StandardJackson2ObjectMapperBuilderCustomizer＃customize 有

configureFeatures（builder，this.jacksonProperties.getSerialization（））;

显示WRITE_DATES_AS_TIMESTAMPS - >false

which shows that "WRITE_DATES_AS_TIMESTAMPS" -> "false"

稍后在 org.springframework.http.converter.json.Jackson2ObjectMapperBuilder #configure 有这个循环

for（对象特征：this.features.keySet（））{
configureFeature（objectMapper，feature，this.fe） atures.get（特征））;
}

再次 this.features 说WRITE_DATES_AS_TIMESTAMPS - >false

and again this.features says "WRITE_DATES_AS_TIMESTAMPS" -> "false"

但在序列化 DateTime com.fasterxml期间.jackson.datatype.jsr310.ser.JSR310FormattedSerializerBase #useTimestamp 表示为false，因为 provider.isEnabled（SerializationFeature.WRITE_DATES_AS_TIMESTAMPS）返回false。

Yet during serialzation of a DateTime com.fasterxml.jackson.datatype.jsr310.ser.JSR310FormattedSerializerBase#useTimestamp says false because provider.isEnabled(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS) returns false.

尝试修复

• 出于绝望，我用 spring.jackson.serialization.write-dates-as替换了 spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS = false -timestamps = false 因为我发现在很多地方提到过（即使引导文档没有暗示这一点）。那这个呢？它们似乎是同义词 - 没有效果。


• 在写这个问题时，建议 WRITE_DATES_AS_TIMESTAMPS不要上电Spring boot 1.3.5 。答案是用 WebMvcConfigurerAdapter 替换 WebMvcConfigurationSupport 。虽然这确实有帮助，但我确实无法理解为什么会如此。

• Out of despair I replaced spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS=false with spring.jackson.serialization.write-dates-as-timestamps=false because I found that mentioned in a lot of places (even though the Boot documentation doesn't hint at this). What about this? They seem to be synonyms - no effect.
• While writing this question SO suggested WRITE_DATES_AS_TIMESTAMPS not woking on Spring boot 1.3.5. The answer says to replace WebMvcConfigurationSupport with WebMvcConfigurerAdapter. While this does help indeed I fail to understand why so.

推荐答案

Spring Boot采用了存在一个 WebMvcConfigurationSupport bean表示您希望完全控制Spring MVC的配置。您通常使用 @EnableWebMvc 来结束这样的bean，但您也可以声明自己的bean或配置类，它是 WebMvcConfigurationSupport 。

Spring Boot takes the presence of a WebMvcConfigurationSupport bean as an indication that you want to take complete control of the configuration of Spring MVC. You'd typically end up with such a bean by using @EnableWebMvc but you could also declare your own bean or configuration class that is a WebMvcConfigurationSupport.

如果您继承 WebMvcConfigurerAdapter 而不是 WebMvcConfigurationSupport 你正在对Spring Boot的Spring MVC自动配置进行附加更改而不是完全接管。

If you subclass WebMvcConfigurerAdapter rather than WebMvcConfigurationSupport you're making an additive change to Spring Boot's auto-configuration of Spring MVC rather than taking over completely.

Spring Boot自动配置Spring的一部分MVC将其配置为使用自动配置的 ObjectMapper 进行HTTP消息转换。如果关闭Boot的Spring MVC自动配置，它将使用自己独立的 ObjectMapper ，它不受任何 spring.jackson。*的影响。 / code>配置设置。

Part of Spring Boot's auto-configuration of Spring MVC is to configure it to use the auto-configured ObjectMapper for HTTP message conversion. If you switch off Boot's auto-configuration of Spring MVC, it will use its own, separate ObjectMapper that is unaffected by any spring.jackson.* configuration settings.

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