小写枚举Gson [英] Lower case enum Gson

问题描述

我需要使用Gson输出枚举值，因为客户端限制需要小写。

I need to output enum values using Gson which due to client limitations need to be in lower case.

例如 CLOSE_FILE 将是 close_file 。

有一种简单的方法吗？我已经看过制作一个实现 JsonSerializer 的类，但看起来我必须手动序列化整个类（这很复杂）是这样的吗？

Is there a simple way of doing this? I have looked at making a class which implements JsonSerializer but it looks like I would have to manually serialize the whole class (which is quite complex) is this the case?

推荐答案

如果您可以控制枚举类型，请使用<$注释其成员c $ c> @SerializedName 并为其指定适当的序列化值。例如，

If you have control over the enum type, annotate its members with @SerializedName and give it the appropriate serialized value. For example,

enum Action {
    @SerializedName("close_file")
    CLOSE_FILE;
}

如果你无法控制枚举，在创建 Gson 实例时提供自定义 TypeAdapter 。例如，

If you don't have control over the enum, provide a custom TypeAdapter when creating a Gson instance. For example,

Gson gson = new GsonBuilder().registerTypeAdapter(Action.class, new TypeAdapter<Action>() {

    @Override
    public void write(JsonWriter out, Action value) throws IOException {
        out.value(value.name().toLowerCase());
    }

    @Override
    public Action read(JsonReader in) throws IOException {
        return Action.valueOf(in.nextString().toUpperCase());
    }
}).create();

这篇关于小写枚举Gson的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！