可以将 Gson 实例用作模型 bean 中的静态字段(重用)吗?

问题描述

这是我实现的模型:

public class LoginSession {
    private static final Gson gson = new Gson();

    private String id;
    private String name;
    private long timestamp;

    public LoginSession(String id, String name) {
        this.id = id;
        this.name = name;
        this.timestamp = System.currentTimeMillis();
    }

    public String toJson() {
        return gson.toJson(this);
    }

    public static LoginSession fromJson(String json) {
        checkArgument(!isNullOrEmpty(json));
        return gson.fromJson(json, LoginSession.class);
    }
}

我认为为每个 LoginSession 实例创建新的 Gson 实例是没有用的.

I thought it's useless to create new Gson instance for every LoginSession instance.

但我担心的是线程安全问题.大约每秒将创建 1000 多个实例.

But what I'm worried about is thread-safety issues. Approximately 1000+ instances/sec will be created.

使用 Gson 实例作为静态字段可以吗?

Is it OK to use Gson instance as static field?

感谢您的任何建议/更正.

Thanks for any advices/corrections.

推荐答案

对我来说似乎很好.GSON 实例中没有任何内容使其与 LoginSession 的特定实例相关，因此它应该是静态的.

It seems just fine to me. There is nothing in the GSON instance that makes it related to a specific instance of LoginSession, so it should be static.

GSON 实例应该是线程安全的，并且有一个错误已修复.

GSON instances should be thread-safe, and there was a bug regarding that which was fixed.

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