Java Parse String

Question

I have a String in a following format:

 {"id":"1263e246711d665a1fc48f09","facebook_username":"","google_username":"814234576543213456788"}

but sometimes this string looks like:

{"id":"1263e246711d665a1fc48f09","facebook_username":"109774662140688764736","google_username":""}

How can I extract those values if I do not know the index of substrings as they will change for different cases?

This is a JSON String. Instead of parsing it, find a JSON library that will generate a JSONObject from this string. If you are using Java EE 7 and higher, you can look at the JSON-P framework. — Buhake Sindi
– Buhake Sindi, Commented Apr 10, 2016 at 21:08
I solved this problem in really easy way altough I belive that GaruGaru's answer is correct. ` json = new JSONObject(JsonResponse); String myID = json.getString("id"); String googleUserName = json.getString("google_username");` — Lenny
– Lenny, Commented Apr 11, 2016 at 13:41

GaruGaru · Accepted Answer · 2016-04-10 21:15:56Z

3

That looks like json format, you should give a look to the Gson library by google that will parse that string automatically.

Your class should look like this

public class Data
{
private String id;

private String facebook_username;

private String google_username;
// getters / setters...
}

And then you can simply create a function that create the object from the json string:

Data getDataFromJson(String json){
     return (Data) new Gson().fromJson(json, Data.class);
}

edited Apr 10, 2016 at 21:15

answered Apr 10, 2016 at 21:10

GaruGaru

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1 Comment

Lilith Daemon Over a year ago

Very nice answer, Welcome to stackoverflow!

No One · Accepted Answer · 2016-04-10 21:17:04Z

1

That String is formated in JSON (JavaScript Object Notation). Is a common language used to transfer data.

You can parse it using Google's library Gson, just add it to your class path .

    Gson gson = new Gson();
    //convert the json string back to object
    DataObject obj = gson.fromJson(br, DataObject.class); //The object you want to convert to.

https://github.com/google/gson

Check this out on how to convert to Java Object

answered Apr 10, 2016 at 21:17

No One

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Comments

Bohemian · Accepted Answer · 2016-04-10 23:58:27Z

0

Parsing as JSON notwithstanding, here's a pure string-based solution:

String id = str.replaceAll(".*\"id\":\"(.*?)\".*", "$1");

And similar for the other two, swapping id for the other field names.

answered Apr 10, 2016 at 23:58

Bohemian♦

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