How to get id of JSON objects in Java

Question

I have previously used GSON, which automatically transfers the data as long as my custom object has a variable with the same name. However, this time, I'm also intrested in the name, or ID, of the object. The object only contains a single long. Example of how it looks:

{"1":123,
 "2":124,
 "4":125,
 "5":126,
 "6":127}

As you can see, the list don't necessarily contain all sequent IDs so I cannot just create a list. How would you solve the problem?

@user3600338 Why don't you use a simple `Map` to deserialise the JSON and then iterate over it? — Danail Alexiev, Apr 04 '16 at 14:43
@DanailAlexiev I do not have any knowledge about Maps, but I guess I know what to look into now :) — user3600338, Apr 04 '16 at 14:46
@user3600338 Ow, didn't expected it to be that simple so I removed my comment. Check that out then : http://stackoverflow.com/questions/4260308/getting-the-objects-property-name But as I'm reading things again, I'm pretty sure you want these values on Java code, not JS. — Adrien Brunelat, Apr 04 '16 at 14:47

score 2 · Accepted Answer · answered Apr 04 '16 at 14:45

2

Instead of deserializing to a specific custom object, just deserialize to Map<String, Integer>:

Type type = new TypeToken<Map<String, Integer>>(){}.getType();
Map<String, Integer> result = gson.fromJson(jsonString, type);

answered Apr 04 '16 at 14:45

nickb

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score 0 · Answer 2 · answered Apr 04 '16 at 14:51

0

Use jython:

import json
json_data = json.loads(your_string_above)
ids = json_data.keys()
# ids now contains [u'1', u'2', u'4', u'5', u'6']

Hope that helps.

answered Apr 04 '16 at 14:51

hd1

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How to get id of JSON objects in Java

2 Answers2