JSON to Java class

Question

Is there an easy way to map data from JSON to fields of my class by means of android APIs?

JSON:

{ email: 'email', password: 'pass' }

My class:

class Credentials
{
    string email;
    string password;
}

Here is an example: pareshnmayani.wordpress.com/2011/09/06/android-json-parsing — Paresh Mayani
– Paresh Mayani, Commented Sep 30, 2011 at 5:21

StaxMan · Accepted Answer · 2011-01-04 00:50:16Z

14

Use Jackson. Much more convenient (and if performance matters, faster) than using bundled org.json classes and custom code:

Credentials c = new ObjectMapper().readValue(jsonString, Credentials.class);

(just note that fields of Credentials need to be 'public' to be discovered; or need to have setter methods)

answered Jan 4, 2011 at 0:50

StaxMan

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Valentin Rocher · Accepted Answer · 2011-01-03 12:49:24Z

8

You could use GSON.

answered Jan 3, 2011 at 12:49

Valentin Rocher

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1 Comment

Joel Martinez Over a year ago

be aware of this issue with HTC phones: sites.google.com/site/gson/gson-on-android

KingCrunch · Accepted Answer · 2011-01-03 12:54:05Z

6

Use the org.json-Package.

JSONObject x = new JSONObject(jsonString);
Credentials c = new Credentials();
c.email = x.getString("email");
c.password = x.getString("password");

Its also part of the android runtime, so you dont need any external package.

answered Jan 3, 2011 at 12:54

KingCrunch

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3 Comments

StaxMan Over a year ago

It is included indeed, but it does not exactly map data. It parses/writes JSON, and offers a simple node-based API. But it is Your code does doing mapping here.

JPM Over a year ago

I do it by making a constructor in the Credentials with the fields so I can do the same code in 2 lines instead. JSONObject x = new JSONObject(jsonString); Credentials c = new Credentials( x.getString("email"),x.getString("password"));

Arthur Melo Over a year ago

Use this => GSON. And this to create a POJO JSONSCHEMA2POJO.

Beasly · Accepted Answer · 2011-01-03 13:06:23Z

0

I suppose you have more than one Credential u want to get...

with the org.json package you could use a JSONArray to get various values at the same time out of one JSON file.

answered Jan 3, 2011 at 13:06

Beasly

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