如何使用杰克逊解析可能是字符串并且可能是数组的字段 [英] How to parse field that may be a string and may be an array with Jackson

问题描述

我是java和objectMapper的新手.我正在尝试解析json字段，该字段可能是键具有两种类型，它可以是字符串或数组.

I'm new with java and objectMapper. I'm trying to parse json field that is possible that a key have two types, it could be a string or array.

示例:

{
  "addresses": [],
  "full_name": [
    "test name_1",
    "test name_2"
  ],
}

或

{
{
  "addresses": [],
  "full_name": "test name_3",
}
}

类示例:

@JsonIgnoreProperties(ignoreUnknown = true)
@Data -> lombok.Data
public class Document {

    private List<String> addresses;

    @JsonProperty("full_name")
    private String fullName;
}

我使用objectMapper反序列化json，当'full_name'字段包含字符串但到达数组时，反序列化失败.

I used objectMapper to deserialize json, works correctly when the 'full_name' field has a string but when arrive an array fail deserialization.

想法是，当到达属性中的字符串放置值但到达数组时，将de数组元素连接为字符串(String.join(，"，value))

The idea is that when arrive a string put value in attribute but when arrive array, concatenate de array elements as string (String.join(",", value))

可以在类方法中应用自定义反序列化吗?例如setFullName()(使用lombok.Data)

It's possible to apply custom deserialization in a class method? For example setFullName() (use lombok.Data)

我在此网站上看到了其他示例，但没有用.

I saw others examples in this site, but not work.

谢谢大家

推荐答案

在jackson 2.6中，您可以使用

From jackson 2.6 you can use JsonFormat.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY

@JsonProperty("full_name")
@JsonFormat(with = JsonFormat.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY)
private String[] fullName;

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