如何将平面JSON转换为分层Java类?

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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);