使用Gson将Java 8 LocalDate序列化为yyyy-mm-dd [英] Serialize Java 8 LocalDate as yyyy-mm-dd with Gson

问题描述

我正在使用Java 8和 Gson 的最新RELEASE版本(通过Maven). 如果我将 LocalDate 序列化，则会得到像这样的东西

I am using Java 8 and the latest RELEASE version (via Maven) of Gson. If I serialize a LocalDate I get something like this

"birthday": {
        "year": 1997,
        "month": 11,
        "day": 25
}

我更喜欢"birthday": "1997-11-25"的地方. Gson是否还支持开箱即用的更简洁格式，还是我必须为LocalDate实现自定义序列化程序?

where I would have preferred "birthday": "1997-11-25". Does Gson also support the more concise format out-of-the-box, or do I have to implement a custom serializer for LocalDates?

(我尝试过gsonBuilder.setDateFormat(DateFormat.SHORT)，但这似乎没有什么不同.)

(I've tried gsonBuilder.setDateFormat(DateFormat.SHORT), but that does not seem to make a difference.)

推荐答案

在没有另行通知之前，我已经实现了一个自定义序列化器，如下所示:

Until further notice, I have implemented a custom serializer like so:

class LocalDateAdapter implements JsonSerializer<LocalDate> {

    public JsonElement serialize(LocalDate date, Type typeOfSrc, JsonSerializationContext context) {
        return new JsonPrimitive(date.format(DateTimeFormatter.ISO_LOCAL_DATE)); // "yyyy-mm-dd"
    }
}

它可以安装例如像这样:

It can be installed e.g. like so:

Gson gson = new GsonBuilder()
        .setPrettyPrinting()
        .registerTypeAdapter(LocalDate.class, new LocalDateAdapter())
        .create();

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