如何将平面JSON转换为分层Java类? [英] How to transform a flat JSON to hierarchical java Class?

问题描述

我需要将某些属性设置为子对象的平面JSON对象反序列化为Java对象.

I need to deserialize a flat JSON object to a Java object with some properties set to child object.

{
 "name": "abcd",
 "addressLine1": "123",
 "addressLine2": "1111"
}

---

Class Student {
  String name;
  Address address;
}

Class Address {
 String line1;
 String line2;
}

如何使用Jackson将我的JSON反序列化为Student对象? 我无法映射addressLine1 to Student.Address.line1 和addressLine2 to Student.Address.line2

How do I deserialize my JSON using Jackson into a Student object? I am not able to map addressLine1 to Student.Address.line1 and addressLine2 to Student.Address.line2

推荐答案

您可以通过以下方式定义数据类:

You can define your data classes this way:

  public static class Student {
    String name;

    @JsonUnwrapped
    Address address;
  }

  public static class Address {
    @JsonProperty("addressLine1")
    String line1;
    @JsonProperty("addressLine2")
    String line2;
  }

然后，您可以按常规方式使用Objectmapper-无需任何其他技巧或解决方法:

Then you can use the Objectmapper in the usual way - without any additional magic or workaround :

Student student = mapper.readValue(json, Student.class);

如果传入的json字符串确实采用您提供的格式(不带引号)，则还要添加:

If your incoming json string is indeed in the format you provided (without quotes) then also add:

mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);

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