GSON解析嵌套数组

Question

我很难理解GSON是否可以默认处理这种json，或者我是否需要为每个子元素实现反序列化器。

输入<<p> json/strong>

{
   "services":[
      {
         "id": 2,
         "name": "Buy"
      },
      {
         "id": 3,
         "name": "Sell"
      }
      ]
   "status": {
      "code": 0,
      "message": ""
   }
}

对我来说最好的结果是让下面的类包含所有的数据

java [POJO]

public class Services {
    public List<ServiceItem> services;
    public Status status;
    public class ServiceItem {
        public int id;
        public String name;
    }
    public class Status {
        public int code;
        public String message;
    }
}

是否有可能让GSON类和json，只是让它工作?或者我需要为每个子类创建反序列化器吗?

Answer 1

按如下方式更正json输入(您在status字段前忘记了逗号)

{
   "services":[
      {
         "id": 2,
         "name": "Buy"
      },
      {
         "id": 3,
         "name": "Sell"
      }
      ],
   "status": {
      "code": 0,
      "message": ""
   }
}

那么让我们考虑你的类如下

public class Services {
    public List<ServiceItem> services;
    public Status status;
    // getters and setters
    @Override
    public String toString() {
        return "["+services.toString()+status.toString()+"]";
    }
    public class ServiceItem {
        public int id;
        public String name;
        // getters and setters
        @Override
        public String toString() {
            return "("+id+","+name+")";
        }
    }
    public class Status {
        public int code;
        public String message;
        // getters and setters
        @Override
        public String toString() {
            return ",("+code+","+message+")";
        }
    }
}

如果输入是文件jsonInput.json，则

Gson gson = new Gson();
Services data = gson.fromJson(new BufferedReader(new FileReader(
        "jsonInput.json")), new TypeToken<Services>() {
}.getType());
System.out.println(data);

如果输入是一个json字符串jsonInput，那么

Gson gson = new Gson();
Services data = gson.fromJson(jsonInput, Services.class);
System.out.println(data);

输出:

[[(2,Buy), (3,Sell)],(0,)]