Java parsing JSON into floats

Question

I have the following json string:

String json = {"z":4.78944,"y":-0.07604187,"x":11.841576};

I would like to parse it and create:

float x = 4.78944;
float y = -0.07604187;
float z = 11.841576;

How can I accomplish this in Java with the input variable String json ?

Answer 1

Use JSONObject: http://www.json.org/javadoc/org/json/JSONObject.html

Thereafter, use the getDouble function to access the double value of the keys x, y and z.

Answer 2

If you want an Object Model oriented deserialization, take a look at Google-Gson here .

Create a model Coordonate.java :

public class Coordonate {
    private float x;
    private float y;
    private float z;

    public float getX() { return x; }
    public float getY() { return y; }
    public float getZ() { return z; }
}

Deserialize your JSON string:

String json = "{\"z\":4.78944,\"y\":-0.07604187,\"x\":11.841576}";
Coordonate cord = new Gson().fromJson(json, Coordonate.class);

Answer 3

You can also use a more powerful library than just the reference implementation and use Jackson . Look at this about how to use it in your usecase.

Answer 4

In addition to Vivec's answer using: http://www.json.org/javadoc/org/json/JSONObject.html

Although there is no getFloat() on JSONObject getting it as a string and parsing it into float worked fine for me.:

Float.parseFloat(myJsonObject.getString("x"));