How to use json in client side

Hello everyone , can you help me please?

in my server wich connect with mysql databse i send to my client one json table like that 

rs = stmt.executeQuery("SELECT * FROM test");

res ="[";

while (rs.next()) {

String titre = rs.getString("id");

String auteur = rs.getString("comment");

res += "\t{\"Titre\": \""+titre+ "\",\n";

res += "\t\"Auteur\": \""+auteur+ "\",\n";

res += "\t},\n";

}

res += "]\n";

 and after i try to receive and use json data but dont work 

in my client side 

final ProjectServiceAsync getService = GWT.create(ProjectService.class);

getService.connection( new AsyncCallback<String>() 

  {

   public void onFailure(Throwable caught) 

   {

    System.out.println("error");

   }

           

   public void onSuccess(String result) 

   {

    JSONValue jsonValue = JSONParser.parseStrict(result);

    com.google.gwt.json.client.JSONObject customerObject = jsonValue.isObject();

    com.google.gwt.json.client.JSONArray jsonArray = customerObject.get("titre").isArray();

    StringBuilder builder = new StringBuilder("** Livre ** \n"); 

    builder.append(jsonArray.get(0).isObject().get("Titre").isString().stringValue()).append(" ");

    Window.alert(builder.toString());

   

    //resultTxt.setText(result);

   }

  });

}

if i use resultTxt.setText(result); i have my data but i want to writte table with line received. thanks for you helping sorry for my english

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