将Gson实例用作模型bean中的静态字段（重用）可以吗？ [英] Is it OK to use Gson instance as a static field in a model bean (reuse)?

问题描述

  public class LoginSession {
 private static final Gson gson = new Gson（ ）; 
 
私人字符串ID; 
私人字符串名称; 
私人长时间戳; 
 
 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））; 
返回gson.fromJson（json，LoginSession.class）; 
} 
} 
  

我认为每次创建新的Gson实例都是没用的LoginSession实例。

但我担心的是线程安全问题。将创建约1000+个实例/秒。

可以使用Gson实例作为静态字段吗？

感谢您的任何建议/更正。 p>

解决方案

对我来说这似乎很好。 GSON实例中没有任何内容与 LoginSession 的特定实例相关，所以它应该是静态的。

GSON实例应该是线程安全的，并且有一个关于的错误已修正。

Here's the model I implemented:

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);
    }
}

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

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

Is it OK to use Gson instance as static field?

Thanks for any advices/corrections.

解决方案

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

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