Java将json字段解析为Period [英] Java parsing json fields into Period

问题描述

如果我的json响应如下：

If I have a json response that looks like this:

{
    year: 40,
    month: 2,
    day: 21
}

代表某人的年龄。我有一个课程来存储：

That represents someone's age. And I have a class to store that:

public class User {
    private Period age;
}

如何解析单个数字并创建期间对象？

How do I parse the individual numbers and create a Period object?

推荐答案

您应该实现客户反序列化程序。请参阅 Awita的回答。

You should implement a customer deserializer. See the Awita's answer.

然而，仅供记录，有官方数据类型Jackson模块，它识别Java 8 Date& Time API数据类型。它将 Period 表示为ISO-8601格式的字符串，而不是您声明的对象。但如果您愿意更改格式，可以考虑使用该模块。

However, just for the record, there is an official datatype Jackson module which recognizes Java 8 Date & Time API data types. It represents Period as a string in the ISO-8601 format, not as object your stated. But if you are willing to change the format, you can consider using that module.

以下是一个示例：

public class JacksonPeriod {
    public static void main(String[] args) throws JsonProcessingException {
        final ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.registerModule(new JavaTimeModule());
        final Period period = Period.of(1, 2, 3);
        final String json = objectMapper.writeValueAsString(period);
        System.out.println(json);
    }
}

输出：

"P1Y2M3D"

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