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 "pages" variable to handle dynamically changing (for exp: "18302") json key?

Is the value of pages known? In other words, will it always be a JSON object with title and pagelanguage? — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Mar 21, 2015 at 1:15
Then I would use a Map with the value type being a POJO type that fits the JSON object with title and pagelanguage. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Mar 21, 2015 at 1:18
in fact, the "18302" can have a custom class too (like Query), so if i use Map than i lost the pojo tree. And i can't access to my custom class in "18302"? — MarsPeople
– MarsPeople, Commented Mar 21, 2015 at 1:25

Stack Exchange Broke The Law · Accepted Answer · 2015-03-21 02:42:33Z

2

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.

answered Mar 21, 2015 at 2:42

Stack Exchange Broke The Law

59.2k7 gold badges57 silver badges103 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Bohemian · Accepted Answer · 2015-03-21 03:06:50Z

1

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"

answered Mar 21, 2015 at 3:06

Bohemian♦

427k103 gold badges603 silver badges750 bronze badges

Collectives™ on Stack Overflow

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

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related