如何反序列化一个Map< String，Object>与GSON [英] How to de-serialize a Map<String, Object> with GSON

问题描述

$ b

 
 
 
 
 code $ {
Thomas：{
age：32，
surname：Scott
}，
Andy： {
age：25，
surname：Miller
} 
} 
  

我希望GSON使它成为一个Map，PersonData显然是一个Object。名称字符串是PersonData的标识符。

正如我所说我对GSON非常新颖，只尝试过类似的东西：

  Gson gson = new Gson（）; 
地图< String，PersonData> （jsonString，new TypeToken< Map< String，PersonData>>（）{}。getType（））; 
  

但是这个错误：

<$ p
$ 在线程main中的异常com.google.gson.JsonSyntaxException：java.lang.IllegalStateException：预期的BEGIN_ARRAY，但在第1行的STRING 3141


任何帮助都会被赞赏：

以下作品为我

  static class PersonData {
 int age; 
字符串姓氏; 
 public String toString（）{
 return[age =+ age +，surname =+ surname +]; 
 
 
 
 public static void main（String [] args）{
 String json ={\Thomas \：{\年龄......：32，姓氏：斯科特，安迪，年龄，25岁，姓氏 ：\Miller \}}; 
 System.out.println（json）; 
 Gson gson = new Gson（）; 
地图< String，PersonData>解码= gson.fromJson（json，新的TypeToken< Map< String，PersonData>>（）{}。getType（））; 
 System.out.println（已解码）; 
 
  

打印

  {Thomas：{age：32，surname：Scott}，Andy：{age：25，surname：Miller} } 
 {Thomas = [age = 32，姓氏= Scott]，Andy = [年龄= 25，姓氏= Miller]} 
  

因此，也许你的 PersonData 类是非常不同的。

i am fairly new to GSON and get a JSON response of this format (just an easier example, so the values make no sense):

{
    "Thomas": {
        "age": 32,
        "surname": "Scott"
    },
    "Andy": {
        "age": 25,
        "surname": "Miller"
    }
}

I want GSON to make it a Map, PersonData is obviously an Object. The name string is the identifier for the PersonData.

As I said I am very new to GSON and only tried something like:

Gson gson = new Gson();
Map<String, PersonData> decoded = gson.fromJson(jsonString, new TypeToken<Map<String, PersonData>>(){}.getType());

but this threw the error:

Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was STRING at line 1 column 3141

Any help is appreciated :)

解决方案

The following works for me

static class PersonData {
    int age;
    String surname;
    public String toString() {
        return "[age = " + age + ", surname = " + surname + "]";
    }
}

public static void main(String[] args) {
    String json = "{\"Thomas\": {\"age\": 32,\"surname\": \"Scott\"},\"Andy\": {\"age\": 25,\"surname\": \"Miller\"}}";
    System.out.println(json);
    Gson gson = new Gson();
    Map<String, PersonData> decoded = gson.fromJson(json, new TypeToken<Map<String, PersonData>>(){}.getType());
    System.out.println(decoded);
}

and prints

{"Thomas": {"age": 32,"surname": "Scott"},"Andy": {"age": 25,"surname": "Miller"}}
{Thomas=[age = 32, surname = Scott], Andy=[age = 25, surname = Miller]}

So maybe your PersonData class is very different.

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