Gson.fromJson, how to use dynamic json value on my POJO class?

Question

gson class:

import com.google.gson.*;

myJson:

{
"time": "notime",
"query": {
     "pages": {
         "18302": {
             "title": "Car",
             "pagelanguage": "en"
         }
      }
}
}

Custom POJO class:

public class MyClass {
    public String time;
    public Query query;

    public class Query {
        public ? pages;

        //...
    }
}

Java code:

Gson gson = new GsonBuilder().create();
MyClass data = gson.fromJson(myJson, MyClass.class);

What Class should i set to my to handle (for exp: "18302") json key? 设置什么类来处理 （例如exp：“ 18302”）的json键？

Answer 1

You could use a Map.

public class MyClass {
    public String time;
    public Query query;

    public static class Query {
        public Map<String, Page> pages; // <-- here

        public static class Page {
            public String title;
            public String pagelanguage;
        }
    }
}

"18302": {...} will be stored as an entry in the Map with the key being "18302" and the value being a new Page object.

Answer 2

If you don't want to create a Page class, this will work:

Map<String, Map<String, String>> pages;

Then to use it:

pages.get("18302").get("title") // "Car"