我如何正确地重用Jackson ObjectMapper? [英] How do I correctly reuse Jackson ObjectMapper?

问题描述

我对我的应用程序中ObjectMapper的工作方式和常规使用感到满意.我想了解的是实现ObjectMapper的最佳方法，以确保可重复使用它，并且我不会在应用程序内创建不必要的实例?

I am happy with how the ObjectMapper works and general use within my application. What I would like to understand is the best way to implement the ObjectMapper to ensure it is re-used and I'm not creating unnecessary instances within my application?

我的想法是可以在Utils类中声明ObjectMapper，如下所示:

My thoughts are that I can declare the ObjectMapper in a Utils class as follows:

public class Utils {

    public final static ObjectMapper mapper = new ObjectMapper();

}

然后，我可以使用各种代码从需要的各个地方引用它，例如:

I could then reference this from the various places I need to using code such as:

JsonSimple jsonSimple = Utils.mapper.readValue(jsonString, JsonSimple.class);

我遇到了另一个问题(我应该将Jackson的ObjectMapper声明为静态字段?)提示了我的方法.我认为可能的主要区别在于，我想跨许多不同的类共享我的ObjectMapper实例，而不仅仅是在一个类中共享.

I came across this other question (Should I declare Jackson's ObjectMapper as a static field?) that prompted my approach. I think maybe the key difference is that I want to share my ObjectMapper instance across many different classes, not just within a single class.

这种方法听起来合适还是我遗漏了一些东西?

Does this approach sound appropriate or am I missing something?

谢谢

推荐答案

每个应用程序可以使用一个实例，前提是您必须在可见后不调用任何配置方法，即您应该在静态内部进行所有初始化阻止.

It's fine to use a single instance per application provided you don't call any configuration methods after it's been made visible i.e. you should do all your initialization inside a static block.

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