Parsing JSon Data using java (google-gson)

Question

Trying to learn how to use JSON and parse the json data.i am using google-gson API to parse my json data.

i am getting my JSON data in the following format

{"guid":{"uri":"http://social.yahooapis.com/v1/me/guid","value":"123456789"}}

and here is my parsing code using google-gson

Gson gson=new Gson();
MyGuid myGuid=new MyGuid();
myGuid=gson.fromJson(response.getBody(), MyGuid.class);

public class MyGuid {

public MyGuid() {

}

private String value;

public String getValue() {
    return value;
}

public void setValue(String value) {
    this.value = value;
}

}

but i am getting the value of guid as null. I know i am doing wrong but being new to JSON format is what making me more confused.

Any help in this regard will be helpful.

Please post a SSCCE or at least the actual code of your MyGuid class (except getters/setters). — Philipp Reichart
– Philipp Reichart, Commented Nov 27, 2011 at 15:33
Before you worry about mixing in your domain classes etc., hard code the JSON as a string, parse that with Gson, get that working, and then worry about the more complicated case of getting JSON from a response object, hooking it up to your class, etc. — I82Much
– I82Much, Commented Nov 27, 2011 at 15:33

McDowell · Accepted Answer · 2011-11-27 15:44:49Z

4

Your data structures should reflect the data you are trying to de-serialize.

For example, you could use something of this form:

public class Data {
  private Map<String, String> guid;

  public Map<String, String> getGuid() {
    return guid;
  }

  public void setGuid(Map<String, String> guid) {
    this.guid = guid;
  }

  public static void main(String[] args) {
    String json =
        "{\"guid\":{" + "\"uri\":\"http://social.yahooapis.com/v1/me/guid\","
            + "\"value\":\"123456789\"}}";
    Data data = new Gson().fromJson(json, Data.class);
    System.out.println(data.getGuid()
        .get("uri"));
  }
}

The guid property of the JSON is mapped to the guid property of the Data type. The properties of that object are placed in a Map as strings.

answered Nov 27, 2011 at 15:44

McDowell

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