如何在Gson序列化中保持字段序列 [英] How to keep fields sequence in Gson serialization

问题描述

看起来像Gson.toJson（对象对象）生成JSON代码与对象的随机传播领域。

  
 public class Foo {
 public String bar; 
 public String baz; 
 
 public Foo（String bar，String baz）{
 this.bar = bar; 
 this.baz = baz; 
} 
} 
 
 Gson gson = new Gson（）; 
 String jsonRequest = gson.toJson（new Foo（bar，baz））; 
 
 // jsonRequest现在可以是{bar：bar，baz：baz}（这是正确的）
 //可以是{baz： baz，bar：bar}（这是错误的顺序）
 
  

<如果GSON不支持字段顺序的定义，那么还有其他的库可以这样做。

例如， Jackson 允许用@JsonPropertyOrder来定义它。不得不指定自己的自定义序列化器对我来说看起来很糟糕。

是的，我同意按照JSON规范，应用程序不应该期望字段的具体排序。

Seems like Gson.toJson(Object object) generates JSON code with randomly spread fields of the object. Is there way to fix fields order somehow?

    public class Foo {
            public String bar;
            public String baz;

            public Foo( String bar, String baz ) {
                    this.bar = bar;
                    this.baz = baz;
            }
    }

    Gson gson = new Gson();
    String jsonRequest = gson.toJson(new Foo("bar","baz"));

    // jsonRequest now can be { "bar":"bar", "baz":"baz" } (which is correct)
    //             and can be { "baz":"baz", "bar":"bar" } (which is a wrong sequence)

Thanks.

解决方案

If GSON doesn't support definition of field order, there are other libraries that do. Jackson allows definining this with @JsonPropertyOrder, for example. Having to specify one's own custom serializer seems like awful lot of work to me.

And yes, I agree in that as per JSON specification, application should not expect specific ordering of fields.

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