获取杰克逊的未知领域列表 [英] Get list of unknown fields from Jackson

问题描述

我有一个JSON模式，以及一个与模式匹配的json字符串，除了它可能有一些额外的字段。如果我不添加 objectMapper.configure（DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES，false）; ，杰克逊将抛出异常，如果那些字段在那里。有没有办法获取这些额外字段的集合来记录它们，即使我抛出异常？

I have a JSON schema, and a json string that matches the schema, except it might have a few extra fields. Jackson will throw an exception if those fields are there if I don't add objectMapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);. Is there a way to obtain a collection of those extra fields to log them, even if I throw an exception?

这是代码的相关位：

public boolean validate(Message<String> json) {
    List<String> errorList = jsonSchema.validate(json.getPayload());
    ObjectMapper mapper = new ObjectMapper();
    try {
        Update update = mapper.readValue(json.getPayload(), Update.class);
    } catch (IOException e) {
        System.out.println("Broken");
    }
    if(!errorList.isEmpty()) {
        LOG.warn("Json message did not match schema: {}", errorList);
    }
    return true;
}

推荐答案

我认为没有开箱即用的这样一个选项。

I don't think there's such an option out of the box.

然而，您可以将@JsonAnyGetter和@JsonAnySetter中的这些未知字段保存在地图（Hashmap，Treemap）中，如本文和这一个。

You could however keep these unkwown fields with @JsonAnyGetter and @JsonAnySetter in a map (Hashmap,Treemap) as exemplified in this article and this one.

将此添加到您的Update类：

Add this to your Update class:

  private Map<String, String> other = new HashMap<String, String>();

  @JsonAnyGetter
  public Map<String, String> any() {
   return other;
  }

 @JsonAnySetter
  public void set(String name, String value) {
   other.put(name, value);
  }

你可以自己抛出异常额外字段列表不为空。检查的方法：

And you can throw an exception yourself if the extra fields list is not empty. The method for checking that:

 public boolean hasUnknowProperties() {
   return !other.isEmpty();
  }

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