Question

I’m stuck with parsing JSON in Java using org.json. My JSON looks like this

[{"id" : "1",
  "type" : "City",
  "description" : [ "short_description" : "some data",
                    "long_description" : "some data",
                    "postal_code" : "49045",
                    "population" : "900000",
                  ],
     }
 ],

How I may parse for example an element of tag description, for example long_description ?

Answer 1

Use json-lib the you can simply add it as a library to your existing project and do like this:

data (JSON):

{‘foo’:’bar’, ‘coolness’:2.0, ‘altitude’:39000, ‘pilot’:{‘firstName’:’Buzz’,’lastName’:’Aldrin’}, ‘mission’:’apollo 11′}

code to parse the data:

import java.io.InputStream;

import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;

import org.apache.commons.io.IOUtils;

public class JsonParsing {

    public static void main(String[] args) throws Exception {
        InputStream is = 
                JsonParsing.class.getResourceAsStream( "sample-json.txt");
        String jsonTxt = IOUtils.toString( is );

        JSONObject json = (JSONObject) JSONSerializer.toJSON( jsonTxt );        
        double coolness = json.getDouble( "coolness" );
        int altitude = json.getInt( "altitude" );
        JSONObject pilot = json.getJSONObject("pilot");
        String firstName = pilot.getString("firstName");
        String lastName = pilot.getString("lastName");

        System.out.println( "Coolness: " + coolness );
        System.out.println( "Altitude: " + altitude );
        System.out.println( "Pilot: " + lastName );
    }
}

References:

• http://answers.oreilly.com/topic/257-how-to-parse-json-in-java/