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Java JSON parsing data

Posted on 2013-05-10
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Last Modified: 2013-10-02
Hello,  I am using Java with GSON. I am having an issue returning values in a organized format.  I want a simple java app to handle parsing data to my classes. When I return values using System.pringln(data2); I seem to obtain unexpected null value for NAME. What do you think the issue is? Why a null value?
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import com.google.gson.Gson;

public class ReadJson {

    public static void main(String... args) throws Exception {

	String JSON_STRING = "{\"data\":[{\"NAME\":\"Brandy\",\"LOCATION\":\"Redding, CA\"},{\"NAME\":\"Jacob\",\"LOCATION\":\"Redding, CA\"},{\"NAME\":\"Tatiana\",\"LOCATION\":\"Wonderland\"},{\"NAME\":\"Tedo\",\"LOCATION\":\"Cottonwood\"}]}";

    DataJSON data2 = new Gson().fromJson(JSON_STRING, DataJSON.class);
    System.out.println(data2);
	
    }
}
class DataJSON {
    public String NAME;
    public String LOCATION;
    public String getName() { return NAME; }
    public String getLocation() { return LOCATION;}

    public void setName(String NAME) { this.NAME = NAME; }
    public void setLoction(String LOCATION) { this.LOCATION = LOCATION; }
    public String toString() {
    	return String.format("NAME:%s,LOCATION:%s", NAME, LOCATION);
    }
}

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Question by:bcamacho
  • 2
3 Comments
 
LVL 83

Expert Comment

by:leakim971
ID: 39157286
Your JSON string contain an array/list not a simple DataJSON object.
Use :
import com.google.gson.Gson;

public class ReadJson {

    public static void main(String... args) throws Exception {
		String JSON_STRING = "{\"data\":[{\"NAME\":\"Brandy\",\"LOCATION\":\"Redding, CA\"},{\"NAME\":\"Jacob\",\"LOCATION\":\"Redding, CA\"},{\"NAME\":\"Tatiana\",\"LOCATION\":\"Wonderland\"},{\"NAME\":\"Tedo\",\"LOCATION\":\"Cottonwood\"}]}";
	
	    Data data2 = new Gson().fromJson(JSON_STRING, Data.class);
	    System.out.println(data2.getDataJSON().get(0).toString());
    }
}

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And :
import java.util.List;

public class Data {
    private List<DataJSON> data;
    public List<DataJSON> getDataJSON() { return data; }
    public void setDataJSON(List<DataJSON> data) { this.data = data; }
}

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And :
public class DataJSON {
    public String NAME;
    public String LOCATION;
    public String getName() { return NAME; }
    public String getLocation() { return LOCATION;}

    public void setName(String NAME) { this.NAME = NAME; }
    public void setLocation(String LOCATION) { this.LOCATION = LOCATION; }
    public String toString() {
    	return String.format("NAME:%s,LOCATION:%s", NAME, LOCATION);
    }
}

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0
 
LVL 1

Accepted Solution

by:
bcamacho earned 0 total points
ID: 39528667
I waited for a solution and honestly time passed by where I found a different solution. Please close this question Expert-Exchange!
0
 
LVL 1

Author Closing Comment

by:bcamacho
ID: 39539249
To long of time has passed from the point I originally ask the question, with a different solution in-place for parsing data there is no need to have this question open.
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