We Keep Coding

getting null JSONObject values

I'm trying to create a JSONObject as code below. But Android Studio is saying that it's null. Where is my mistake?
I tried two different ways to create it.
1st
String JSONString = "{" +
" \"retorno\": {" +
" \"empresas\": [" +
" {" +
" \"cnpj\": \"05.743.645/0001-38\"," +
" \"razao_social\": \"GISELA TRANSPORTES E DISTRIBUIDORA DE FLORES LTDA - ME\"," +
" \"endereco\": \"EST RSC-453 (ROTA DO SOL) KM 93,8\"," +
" \"bairro\": \"BAIRRO ALFANDEGA\"," +
" \"numero\": 26," +
" \"complemento\": \"\"," +
" \"telefone\": \"3462 2749\"," +
" \"celular\": \"\"," +
" \"email\": \"giselaflores#giselaflores.com.br\"" +
" }" +
" ]" +
" }" +
"}";
try {
JSONObject jsonEmpresa = new JSONObject(JSONString);
String email = jsonEmpresa.getString("email");
} catch (JSONException e) {
e.printStackTrace();
}
2nd
try {
JSONObject jsonEmpresa = new JSONObject();
jsonEmpresa.put("cnpj", "05.743.645/0001-38");
jsonEmpresa.put("razao_social", "GISELA TRANSPORTES E DISTRIBUIDORA DE FLORES LTDA - ME");
jsonEmpresa.put("endereco", "EST RSC-453 (ROTA DO SOL) KM 93,8");
jsonEmpresa.put("bairro", "BAIRRO ALFANDEGA");
jsonEmpresa.put("numero", 26);
jsonEmpresa.put("complemento", "");
jsonEmpresa.put("telefone", "3462 2749");
jsonEmpresa.put("celular", "");
jsonEmpresa.put("email", "giselaflores#giselaflores.com.br");
String email = jsonEmpresa.getString("email");
} catch (JSONException e) {
e.printStackTrace();
}
String email's value is null, it should be giselaflores#giselaflores.com.br.
When I tried to debug, I had the message jsonEmpresa: "null".

To get email value for given example, you should to do like
String JSONString = "{" +
" \"retorno\": {" +
" \"empresas\": [" +
" {" +
" \"cnpj\": \"05.743.645/0001-38\"," +
" \"razao_social\": \"GISELA TRANSPORTES E DISTRIBUIDORA DE FLORES LTDA - ME\"," +
" \"endereco\": \"EST RSC-453 (ROTA DO SOL) KM 93,8\"," +
" \"bairro\": \"BAIRRO ALFANDEGA\"," +
" \"numero\": 26," +
" \"complemento\": \"\"," +
" \"telefone\": \"3462 2749\"," +
" \"celular\": \"\"," +
" \"email\": \"giselaflores#giselaflores.com.br\"" +
" }" +
" ]" +
" }" +
"}";
try {
JSONObject jsonEmpresa = new JSONObject(JSONString);
JSONObject retorno = jsonEmpresa.getJSONObject("retorno");
JSONArray empresas = retorno.getJSONArray("empresas");
JSONObject empresa = empresas.getJSONObject(0);
String email =empresa.getString("email");
} catch (JSONException e) {
e.printStackTrace();
}

How to call methods (maybe recursive) itself JAVA

Hello I am new in Java and I have a question.
I am using a package to parse JSON Markups but the following problem is this:
{
"example": {
"subThing": "value"
},
"anotherThing" : 0
...
}
if I call MyClass.getString("example").getString("subThing"); then I am getting the value of subThing.
I want to call these getString() so often as possible ina for loop programmatically with index variable. But I don't know how to do.
for(int i = 0; i > getCurrentState(); i++) {
//Here I want to call getString();
//I want in round loop to call getString();
//In second round loop to call getString().getString();
}
Sorry I just started using java 1 week ago.
edit:
I mean how to call get() and/or getString() programmatically in for loop?

I'm not sure if I understand you correctly, but you may use the following technique here:
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class App
{
public static void main( String[] args ) throws JSONException {
JSONObject newObj = new JSONObject("{" +
"\"data\": [\n" +
" {\n" +
"\"id\": 1,\n" +
" \"userId\": 1,\n" +
" \"name\": \"ABC\",\n" +
" \"modified\": \"2014-12-04\",\n" +
" \"created\": \"2014-12-04\",\n" +
" \"items\": [\n" +
" {\n" +
" \"email\": \"abc#gmail.com\",\n" +
" \"links\": [\n" +
" {\n" +
" }\n" +
" ]\n" +
" }\n" +
" ]\n" +
" }\n" +
" ]\n" +
"\n" +
"}");
JSONArray items = newObj.getJSONArray("data");
for (int it = 0; it < items.length(); it++) {
JSONObject contactItem = items.getJSONObject(it);
String userName = contactItem.getString("name");
JSONArray item = contactItem.getJSONArray("items");
for (int i = 0; i < items.length(); i++) {
String email = item.getJSONObject(i).getString("email");
System.out.println(email);
}
System.out.println("Name----------" + userName);
}
}
}
or even better and simpler is to use JsonPath
For your json is would be smth like this
String substring = JsonPath.parse(json).read("$.example.subThing", String.class);
String anotherstring = JsonPath.parse(json).read("$.anotherThing", String.class);

Losing focus on SwingX JCOMBO BOX

I want to achieve AutoSuggest ComboBox 2 problems I am facing
1st getting an array of id and name both want the name only.
Array i am receiving
2nd losing focus on typing the text.
Please help
database Query
public SentenceList getAutoProductList() {
return new StaticSentence(s, "SELECT "
+ "P.ID, "
+ "P.REFERENCE, "
+ "P.CODE, "
+ "P.CODETYPE, "
+ "P.NAME, "
+ "P.PRICEBUY, "
+ "P.PRICESELL, "
+ "P.CATEGORY, "
+ "P.TAXCAT, "
+ "P.ATTRIBUTESET_ID, "
+ "P.STOCKCOST, "
+ "P.STOCKVOLUME, "
+ "P.IMAGE, "
+ "P.ISCOM, "
+ "P.ISSCALE, "
+ "P.ISKITCHEN, "
+ "P.PRINTKB, "
+ "P.SENDSTATUS, "
+ "P.ISSERVICE, "
+ "P.ATTRIBUTES, "
+ "P.DISPLAY, "
+ "P.ISVPRICE, "
+ "P.ISVERPATRIB, "
+ "P.TEXTTIP, "
+ "P.WARRANTY, "
+ "P.STOCKUNITS "
+ "FROM PRODUCTS P "
+ "ORDER BY NAME", null, ProductInfoExt.getSerializerRead());
}
Auto Complete JcomboBox Code
SentenceList sentProductNames = dlSales.getAutoProductList();
m_JComboProductName.setEditable(true);
ComboBoxValModel m_jProductNameModel = new ComboBoxValModel();
editor = (JTextComponent) m_JComboProductName.getEditor().getEditorComponent();
List productList = null;
try {
productList = sentProductNames.list();
} catch (Exception e) {
}
productList.add(0, null);
m_jProductNameModel = new ComboBoxValModel(productList);
m_JComboProductName.setModel(m_jProductNameModel);
AutoCompleteDecorator.decorate(m_JComboProductName);
System.out.println("product List "+ productList);
if(m_JComboProductName.getItemCount()>0){
m_JComboProductName.setSelectedIndex(0);
}

Cycle for error

I have one problem with my cycle for.
I parse data with JsonParser and after i use one cycle for print all data but i recive only the last result.
This is the code:
try{
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Log.d("id_Persons", "id: " + json_data.getString("id_Persons")
+ ", nome: " + json_data.getString("name")
+ json_data.getString("address")
);
stringaFinale = json_data.getString("id_Persons") + " "
+ json_data.getString("name") + " "
+ json_data.getString("address");
}
return stringaFinale;
}
catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
but, with
Log.d("id_Persons", "id: " + json_data.getString("id_Persons")
+ ", nome: " + json_data.getString("name")
+ json_data.getString("address")
);
I do not understand what is the error.
This is the screen of app

You are overwriting its value in each iteration of for loop.
Change
stringaFinale = json_data.getString("id_Persons") + " " + json_data.getString("name") + " " + json_data.getString("address");
to
stringaFinale += json_data.getString("id_Persons") + " " + json_data.getString("name") + " " + json_data.getString("address");
Note: You should initialize stringaFinale with empty string like this
String stringaFinale = "";
Update: Another nicer way is to use StringBuilder like this
// declare it before the loop
StringBuilder stringaFinale = new StringBuilder(200); // use appropriate size
//Inside the loop
stringaFinale.append(json_data.getString("id_Persons") + " " + json_data.getString("name") + " " + json_data.getString("address"));
//Get the value
stringFinale.toString();

JSON String to POJO, using GSON, clarification needed

I have a JSON file, as String:
String compString = "{\n" +
" \"Component\": {\n" +
" \"name\": \"Application\",\n" +
" \"environment\": \"QA\",\n" +
" \"hosts\": [\n" +
" \"box1\",\n" +
" \"box2\"\n" +
" ],\n" +
" \"directories\": [\n" +
" \"/path/to/dir1/\",\n" +
" \"/path/to/dir2/\",\n" +
" \"/path/to/dir1/subdir/\",\n" +
" ]\n" +
" }\n" +
" }";
I have a bean representing it (correct if incorrectly)
public class Component {
String name;
String environment;
List<String> hosts = new ArrayList<String>();
List<String> directories = new ArrayList<String>();
// standard getters and setters
}
I am trying to feed this String to this class by:
Gson gson = new Gson();
Component component = gson.fromJson(compString, Component.class);
System.out.println(component.getName());
Above does not work. (I am getting null back, as if Component's name value is never set)
What am i missing please?

In fact, you have to remove the enclosing class from Json.
Indeed, JSON begins with the content of the enclosing class.
So your JSON would be:
String compString = "{\n" +
" \"name\": \"Application\",\n" +
" \"environment\": \"QA\",\n" +
" \"hosts\": [\n" +
" \"box1\",\n" +
" \"box2\"\n" +
" ],\n" +
" \"directories\": [\n" +
" \"/path/to/dir1/\",\n" +
" \"/path/to/dir2/\",\n" +
" \"/path/to/dir1/subdir/\",\n" +
" ]\n" +
" }\n";

String compString =
" {\n" +
" \"name\": \"Application\",\n" +
" \"environment\": \"QA\",\n" +
" \"hosts\": [\n" +
" \"box1\",\n" +
" \"box2\"\n" +
" ],\n" +
" \"directories\": [\n" +
" \"/path/to/dir1/\",\n" +
" \"/path/to/dir2/\",\n" +
" \"/path/to/dir1/subdir/\",\n" +
" ]}" ;
I think you should read more about json, I have removed something in your json string and then success.