展平杰克逊中的嵌套属性 [英] Flattening nested attributes in Jackson

问题描述

我需要定义一个平面POJO，它将（平面）属性映射到JSON规范中的嵌套对象。用代码更好地解释

I have the need of defining a flat POJO that maps its (flat) attributes to a nested object in its JSON specification. Better explain with code

{
    "offset": 0,
    "pageSize": 10,
    "filter": {
        "key1":"value1",
        "key2": true,
        ....
    }
}

我的POJO如下所示：

My POJO shall look like the following:

public class Pojo {
    private int offset;
    private int pageSize;

    private String key1;
    private boolean key2;
}

到目前为止，我已尝试注释那些键属性 @JsonProperty 及其值属性

So far I have tried annotating those key properties with @JsonProperty with its value attribute

@JsonProperty("filter.key1")
private String key1;

但是当我进入MVC控制器时，这些属性虽然在JSON中设置，但在解码时为null POJO。

But when I went into the MVC controller those properties, though set in JSON, were null in the decoded POJO.

我该如何解决这个问题？我做错了什么？

How can I fix this? What did I do wrong?

我绝对不想创建嵌套的子类

I absolutely don't want to create nested subclasses

推荐答案

可能目前是不可能的。

这是因为Jackson目前支持 @JacksonUnwrapped 对于相反的情况，但没有 @JacksonWrapped

This because Jackson currently supports @JacksonUnwrapped for the opposite case, but no @JacksonWrapped

• 此处讨论： http://jackson-users.ning.com/forum / topics / use-annotations-to-skip-levels


• 功能请求： https://github.com/FasterXML/jackson-annotations/issues/42

• Discussion here: http://jackson-users.ning.com/forum/topics/use-annotations-to-skip-levels
• Feature request: https://github.com/FasterXML/jackson-annotations/issues/42

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