Parsing JSON Array using GSON

Question

I have a basic JSON with all data contained in an array. One would think that it would be simple to retreive a value out of the array, but after multiple hours of trying eve

Answer 1

Your json format is not correct which you have posted here correct it for example

{ 
   "versions":[
      {
         "id":"2.7",
         "time":"2012-10-25T15:00:00+02:00",
         "releaseTime":"2013-10-25T15:00:00+02:00",
         "type":"Release"
      },
      {
         "id":"2.6.4",
         "time":"2011-12-2T14:01:07+02:00",
         "releaseTime":"2013-12-2T14:01:07+02:00",
         "type":"Develop"
      }
   ]
} 

First Define Classes you will get everything

public class Version {

       private List<Versions> versions;

       public List<Versions> getVersions() {
           return versions;
       }

       public void setVersions(List<Versions> versions) {
           this.versions = versions;
       }

       @Override
       public String toString() {
           return "Version [versions=" + versions + "]";
       }
}

public class Versions {

    private String  id;
    private String  time;
    private String  releaseTime;
    private String  type;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getTime() {
        return time;
    }
    public void setTime(String time) {
        this.time = time;
    }
    public String getReleaseTime() {
        return releaseTime;
    }
    public void setReleaseTime(String releaseTime) {
        this.releaseTime = releaseTime;
    }
    public String getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }
    @Override
    public String toString() {
        return "Versions [id=" + id + ", time=" + time + ", releaseTime="
                + releaseTime + ", type=" + type + "]";
    }
}

Finally you can parse the JSON as like here

JsonReader reader = new JsonReader(new FileReader(Constants.VersJson));
Gson gson = new Gson();
Version version = gson.fromJson(reader, Version.class);

Answer 2

i have also faced json array parsing using gson here is my code solved it

this is my reader class functions

JsonReader reader = new JsonReader(new InputStreamReader(new FileInputStream(myFile)));
	System.out.println( reader);
		 Gson gson = new Gson();
		    JsonParser parser = new JsonParser();
			   JsonArray jArray = parser.parse(reader).getAsJsonArray();
			    ArrayList<JsonOperations> lcs = new ArrayList<JsonOperations>();
 for(JsonElement obj : jArray )
	    {
	    	JsonOperations cse = gson.fromJson( obj , JsonOperations.class);
			    	
		        lcs.add(cse);
	  }
	    for ( JsonOperations tUser : lcs)
		  		{
			  		  System.out.println(tUser);
			  		}

my json operation class is

public class JsonOperations {
	String match_id, pool_name, team1_name, team1_image, team2_name,
			team2_image, match_date, match_country, match_venue, predicted;

	public JsonOperations() {
		
	}

	public JsonOperations(String match_id, String pool_name, String team1_name,
			String team1_image, String team2_name, String team2_image,
			String match_date, String match_country, String match_venue,
			String predicted) {

		this.match_id = match_id;
		this.pool_name = pool_name;
		this.team1_name = team1_name;
		this.team1_image = team1_image;
		this.team2_name = team2_name;
		this.team2_image = team2_image;
		this.match_date = match_date;
		this.match_country = match_country;
		this.match_venue = match_venue;
		this.predicted = predicted;

	}

	public void set_team1(String team1_name) {

		this.team1_name = team1_name;
	}

	public void set_team2(String team2_name) {

		this.team2_name = team2_name;
	}

	public String get_team1() {

		return team1_name;
	}

	public String get_team2() {

		return team2_name;
	}

	@Override
	public String toString() {
		// TODO Auto-generated method stub
		return this.get_team1() + this.get_team2();
	}

}