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Java: Create CSV from Get Array with Object

I have
data= [{
id=1,
employee_name=Tiger Nixon,
employee_salary=320800,
employee_age=61,
profile_image=
},
{
id=2,
employee_name=Garrett Winters,
employee_salary=170750,
employee_age=63,
profile_image=
},
{
id=3,
employee_name=Ashton Cox,
employee_salary=86000,
employee_age=66,
profile_image=
},
{
id=4,
employee_name=Cedric Kelly,
employee_salary=433060,
employee_age=22,
profile_image=
}
]
I have employee class
public class Employee {
private String employee_name;
private String employee_salary;
private String employee_age;
private String id;
private String profile_image;
public String toCsvRow() {
String csvRow = "";
for (String value : Arrays.asList(employee_name,employee_salary,employee_age)) {
String processed = value;
if (value.contains("\"") || value.contains(",")) {
processed = "\"" + value.replaceAll("\"", "\"\"") + "\"";
}
csvRow += "," + processed;
}
return csvRow.substring(1);
}
public String getEmployee_name() {
return employee_name;
}
public String getEmployee_salary() {
return employee_salary;
}
public String getEmployee_age() {
return employee_age;
}
}
I tried for
Map<String, ArrayList<Employee>> map = mapper.readValue(url, Map.class);
ArrayList<Employee> emps = map.get("data");
emps.get(0).toCsvRow()
Exception in thread "main" java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to org.example.model.Employee
Now I cannot call toCSVRow using emps.

Use Gson to parse JSON to ArrayList, for CSV conversion you can use org.json.CDL
See this is working fine
String str = "[{" +
" id=1," +
" employee_name=\"Tiger Nixon\"," +
" employee_salary=320800," +
" employee_age=61," +
" profile_image=\"khkjh\"" +
" }," +
" {" +
" id=2," +
" employee_name=\"Garrett Winters\"," +
" employee_salary=170750," +
" employee_age=63," +
" profile_image=\"\"" +
" }," +
" {" +
" id=3," +
" employee_name=\"Ashton Cox\"," +
" employee_salary=86000," +
" employee_age=66," +
" profile_image=\"\"" +
" }," +
" {" +
" id=4," +
" employee_name=\"Cedric Kelly\"," +
" employee_salary=433060," +
" employee_age=22," +
" profile_image=\"\"" +
" }" +
" ]";
try{
Gson gson = new Gson();
ArrayList<Employee> list = gson.fromJson(str, ArrayList.class);
String csv = CDL.toString(new JSONArray(list));
}catch (Exception e){
e.printStackTrace();
}
Output:
id,employee_name,employee_salary,employee_age,profile_image
1.0,Tiger Nixon,320800.0,61.0,khkjh
2.0,Garrett Winters,170750.0,63.0,
3.0,Ashton Cox,86000.0,66.0,
4.0,Cedric Kelly,433060.0,22.0

consuming json to model using java

People, I need help, if anyone can help me, I thank you!
I am getting a JSON and wanted to know if I can bring the information to a LIST of my model.
is a call to send 1 SMS
This is the first time I try to do something with JSON
my model has all getters and setters.
Model
public class Zenvia {
#JsonProperty("sendSmsResponse")
private String sendSmsResponse;
//Request
#JsonProperty("id")
private String id;
#JsonProperty("from")
private String from;
#JsonProperty("to")
private String to;
#JsonProperty("msg")
private String msg;
#JsonProperty("schedule")
private String schedule;
#JsonProperty("callbackOption")
private String callbackOption;
#JsonProperty("aggregateId")
private String aggregateId;
#JsonProperty("flashSms")
private boolean flashSms;
//Response
private long stats;
#JsonProperty("statusCode")
private String statusCode;
#JsonProperty("statusDescription")
private String statusDescription;
#JsonProperty("detailCode")
private String detailCode;
#JsonProperty("detailDescription")
private String detailDescription;
#JsonProperty("mobileOperatorName")
private String mobileOperatorName;
#JsonProperty("received")
private String received;
//getters and setters
}
my call
public Zenvia senderUnique(Zenvia zenvia) {
Response response = null;
try {
Client client = ClientBuilder.newClient();
Entity payload = Entity.json(" {\n"
+ " \"sendSmsRequest\": {\n"
+ " \"from\": \"" + zenvia.getFrom() + "\",\n"
+ " \"to\": \"" + zenvia.getTo() + "\",\n"
+ " \"schedule\": \"" + zenvia.getSchedule() + "\",\n"
+ " \"msg\": \"" + zenvia.getMsg() + "\",\n"
+ " \"callbackOption\": \"" + zenvia.getCallbackOption() + "\",\n"
+ " \"id\": \"" + zenvia.getId() + "\",\n"
+ " \"aggregateId\": \"" + zenvia.getAggregateId() + "\",\n"
+ " \"flashSms\": " + zenvia.isFlashSms() + "\n"
+ " }\n"
+ " }");
response = client.target("https://api-rest.zenvia360.com.br/services/send-sms")
.request(MediaType.APPLICATION_JSON_TYPE)
.header("Authorization", "Basic ***********")
.header("Accept", "application/json")
.post(payload);
System.out.println("status: " + response.getStatus());
System.out.println("headers: " + response.getHeaders());
System.out.println("body:" + response.readEntity(String.class));
response.close();
} catch (Exception e) {
e.printStackTrace();
}
return zenvia;
}
at this point I have this return, which is the best practice of consuming this data, I have a model prepared to receive this information.
converting to a LIST?
as?
string JSON response that im getting
body:{
"sendSmsMultiResponse" : {
"sendSmsResponseList" : [ {
"statusCode" : "10",
"statusDescription" : "Error",
"detailCode" : "080",
"detailDescription" : "Message with same ID already sent"
}, {
"statusCode" : "10",
"statusDescription" : "Error",
"detailCode" : "080",
"detailDescription" : "Message with same ID already sent"
}, {
"statusCode" : "10",
"statusDescription" : "Error",
"detailCode" : "080",
"detailDescription" : "Message with same ID already sent"
} ]
}
}
can be one or more results, so is a list.

You can read the response to a String and then Map it to your Entity class using jackson
ObjectMapper mapper = new ObjectMapper();
String jsonInString = response.readEntity(String.class);
//Convert JSON from String to Object
List<YourEntityModelObject> objList = mapper.readValue(jsonInString, new TypeReference<List<YourEntityModelObject>>(){});

How wrap json array to custom object with collection via Gson?

How wrap json array to custom object with collection containing this array via Gson? I have following json string:
[
{
"showId":410,
"siteId":85,
"name":"Майстер і маргарита",
"duration":7200,
"providerId":1016,
"events":[
{
"siteId":85,
"eventSiteId":0,
"providerId":1016,
"eventId":1178,
"hallId":0,
"premiere":false,
"origin":"20140912190000"
}
]
}
]
and want to deserialize it to the object bellow:
public class Shows {
private List<Show> shows;
public List<Show> getShows() {
return shows;
}
public void setShows(List<Show> shows) {
this.shows = shows;
}
}

This Json message is represent a List<Show> that Show contains a List of Events as well.
This is not a Json of Shows, if so it should be like this.
{
"shows":[
{
"showId":410,
"siteId":85,
"name":"Майстер і маргарита",
"duration":7200,
"providerId":1016,
"events":[
{
"siteId":85,
"eventSiteId":0,
"providerId":1016,
"eventId":1178,
"hallId":0,
"premiere":false,
"origin":"20140912190000"
}
]
}
]
}
But you can try this way to get List<Show> and set it to Shows
You can try this way.
Type collectionType = new TypeToken<List<Show>>() {
}.getType();
String jsonString="[\n" +
"\n" +
" {\n" +
" \"showId\":410,\n" +
" \"siteId\":85,\n" +
" \"name\":\"Майстер і маргарита\",\n" +
" \"duration\":7200,\n" +
" \"providerId\":1016,\n" +
" \"events\":[\n" +
" {\n" +
" \"siteId\":85,\n" +
" \"eventSiteId\":0,\n" +
" \"providerId\":1016,\n" +
" \"eventId\":1178,\n" +
" \"hallId\":0,\n" +
" \"premiere\":false,\n" +
" \"origin\":\"20140912190000\"\n" +
" }\n" +
" ]\n" +
" }\n" +
"\n" +
"]";
List<Show> showList=new Gson().fromJson(jsonString,collectionType);
Shows shows=new Shows();
shows.setShows(showList);
System.out.println(shows);
My result.
Shows{shows=[Show{showId=410, siteId=85, name='Майстер і маргарита',
duration=7200, providerId=1016, events=[Events{siteId=85,
eventSiteId=0, providerId=1016, eventId=1178, hallId=0,
premiere=false, origin='20140912190000'}]}]}
My Show class.
public class Show {
private int showId;
private int siteId;
private String name;
private int duration;
private int providerId;
private List<Events> events;
//getters and setters
#Override
public String toString() {
return "Show{" +
"showId=" + showId +
", siteId=" + siteId +
", name='" + name + '\'' +
", duration=" + duration +
", providerId=" + providerId +
", events=" + events +
'}';
}
}
My Events class
public class Events {
private int siteId;
private int eventSiteId;
private int providerId;
private int eventId;
private int hallId;
private boolean premiere;
private String origin;
// getters and setters
#Override
public String toString() {
return "Events{" +
"siteId=" + siteId +
", eventSiteId=" + eventSiteId +
", providerId=" + providerId +
", eventId=" + eventId +
", hallId=" + hallId +
", premiere=" + premiere +
", origin='" + origin + '\'' +
'}';
}
}

You can try this.
//lets assume the json string to be in the variable data
Shows shows = new Gson().fromJson(data, Shows.class);

Parsing JSON string in Java

I am trying to parse a JSON string in java to have the individual value printed separately. But while making the program run I get the following error-
Exception in thread "main" java.lang.RuntimeException: Stub!
at org.json.JSONObject.<init>(JSONObject.java:7)
at ShowActivity.main(ShowActivity.java:29)
My Class looks like-
import org.json.JSONException;
import org.json.JSONObject;
public class ShowActivity {
private final static String jString = "{"
+ " \"geodata\": ["
+ " {"
+ " \"id\": \"1\","
+ " \"name\": \"Julie Sherman\","
+ " \"gender\" : \"female\","
+ " \"latitude\" : \"37.33774833333334\","
+ " \"longitude\" : \"-121.88670166666667\""
+ " }"
+ " },"
+ " {"
+ " \"id\": \"2\","
+ " \"name\": \"Johnny Depp\","
+ " \"gender\" : \"male\","
+ " \"latitude\" : \"37.336453\","
+ " \"longitude\" : \"-121.884985\""
+ " }"
+ " }"
+ " ]"
+ "}";
private static JSONObject jObject = null;
public static void main(String[] args) throws JSONException {
jObject = new JSONObject(jString);
JSONObject geoObject = jObject.getJSONObject("geodata");
String geoId = geoObject.getString("id");
System.out.println(geoId);
String name = geoObject.getString("name");
System.out.println(name);
String gender=geoObject.getString("gender");
System.out.println(gender);
String lat=geoObject.getString("latitude");
System.out.println(lat);
String longit =geoObject.getString("longitude");
System.out.println(longit);
}
}
Let me know what is it I am missing, or the reason why I do get that error everytime I run the application. Any comments would be appreciated.

See my comment.
You need to include the full org.json library when running as android.jar only contains stubs to compile against.
In addition, you must remove the two instances of extra } in your JSON data following longitude.
private final static String JSON_DATA =
"{"
+ " \"geodata\": ["
+ " {"
+ " \"id\": \"1\","
+ " \"name\": \"Julie Sherman\","
+ " \"gender\" : \"female\","
+ " \"latitude\" : \"37.33774833333334\","
+ " \"longitude\" : \"-121.88670166666667\""
+ " },"
+ " {"
+ " \"id\": \"2\","
+ " \"name\": \"Johnny Depp\","
+ " \"gender\" : \"male\","
+ " \"latitude\" : \"37.336453\","
+ " \"longitude\" : \"-121.884985\""
+ " }"
+ " ]"
+ "}";
Apart from that, geodata is in fact not a JSONObject but a JSONArray.
Here is the fully working and tested corrected code:
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class ShowActivity {
private final static String JSON_DATA =
"{"
+ " \"geodata\": ["
+ " {"
+ " \"id\": \"1\","
+ " \"name\": \"Julie Sherman\","
+ " \"gender\" : \"female\","
+ " \"latitude\" : \"37.33774833333334\","
+ " \"longitude\" : \"-121.88670166666667\""
+ " },"
+ " {"
+ " \"id\": \"2\","
+ " \"name\": \"Johnny Depp\","
+ " \"gender\" : \"male\","
+ " \"latitude\" : \"37.336453\","
+ " \"longitude\" : \"-121.884985\""
+ " }"
+ " ]"
+ "}";
public static void main(final String[] argv) throws JSONException {
final JSONObject obj = new JSONObject(JSON_DATA);
final JSONArray geodata = obj.getJSONArray("geodata");
final int n = geodata.length();
for (int i = 0; i < n; ++i) {
final JSONObject person = geodata.getJSONObject(i);
System.out.println(person.getInt("id"));
System.out.println(person.getString("name"));
System.out.println(person.getString("gender"));
System.out.println(person.getDouble("latitude"));
System.out.println(person.getDouble("longitude"));
}
}
}
Here's the output:
C:\dev\scrap>java -cp json.jar;. ShowActivity
1
Julie Sherman
female
37.33774833333334
-121.88670166666667
2
Johnny Depp
male
37.336453
-121.884985

To convert your JSON string to hashmap you can make use of this :
HashMap<String, Object> hashMap = new HashMap<>(Utility.jsonToMap(response)) ;
Use this class :) (handles even lists , nested lists and json)
public class Utility {
public static Map<String, Object> jsonToMap(Object json) throws JSONException {
if(json instanceof JSONObject)
return _jsonToMap_((JSONObject)json) ;
else if (json instanceof String)
{
JSONObject jsonObject = new JSONObject((String)json) ;
return _jsonToMap_(jsonObject) ;
}
return null ;
}
private static Map<String, Object> _jsonToMap_(JSONObject json) throws JSONException {
Map<String, Object> retMap = new HashMap<String, Object>();
if(json != JSONObject.NULL) {
retMap = toMap(json);
}
return retMap;
}
private static Map<String, Object> toMap(JSONObject object) throws JSONException {
Map<String, Object> map = new HashMap<String, Object>();
Iterator<String> keysItr = object.keys();
while(keysItr.hasNext()) {
String key = keysItr.next();
Object value = object.get(key);
if(value instanceof JSONArray) {
value = toList((JSONArray) value);
}
else if(value instanceof JSONObject) {
value = toMap((JSONObject) value);
}
map.put(key, value);
}
return map;
}
public static List<Object> toList(JSONArray array) throws JSONException {
List<Object> list = new ArrayList<Object>();
for(int i = 0; i < array.length(); i++) {
Object value = array.get(i);
if(value instanceof JSONArray) {
value = toList((JSONArray) value);
}
else if(value instanceof JSONObject) {
value = toMap((JSONObject) value);
}
list.add(value);
}
return list;
}
}

credit to this blog
This answer may help someone whose requirements are different.
This is your Json string
{
"pageNumber":20,
"pageTitle":"example page title",
"pageInfo": {
"pageName": "Homepage",
"logo": "https://www.example.com/logo.jpg"
},
"posts": [
{
"post_id": "0123456789",
"actor_id": "1001",
"author_name": "Jane Doe",
"post_title": "How to parse JSON in Java",
"comments": [],
"time_of_post": "1234567890"
}
]
}
and this is how to read it
import org.json.JSONArray;
import org.json.JSONObject;
public class ParseJSON {
static String json = "...";
public static void main(String[] args) {
JSONObject obj = new JSONObject(json);
String pageTitle = obj.getString("pageTitle");
String pageNumber= obj.getInt("pageNumber");
String pageName = obj.getJSONObject("pageInfo").getString("pageName");
System.out.println(pageNumber);
System.out.println(pageTitle );
System.out.println(pageName);
JSONArray arr = obj.getJSONArray("posts");
for (int i = 0; i < arr.length(); i++) {
String post_id = arr.getJSONObject(i).getString("post_id");
System.out.println(post_id);
}
}
}

Looks like for both of your objects (inside the array), you have an extra closing brace after "Longitude".

Firstly there is an extra } after every array object.
Secondly "geodata" is a JSONArray. So instead of JSONObject geoObject = jObject.getJSONObject("geodata"); you have to get it as JSONArray geoObject = jObject.getJSONArray("geodata");
Once you have the JSONArray you can fetch each entry in the JSONArray using geoObject.get(<index>).
I am using org.codehaus.jettison.json.

Here is the example of one Object, For your case you have to use JSONArray.
public static final String JSON_STRING="{\"employee\":{\"name\":\"Sachin\",\"salary\":56000}}";
try{
JSONObject emp=(new JSONObject(JSON_STRING)).getJSONObject("employee");
String empname=emp.getString("name");
int empsalary=emp.getInt("salary");
String str="Employee Name:"+empname+"\n"+"Employee Salary:"+empsalary;
textView1.setText(str);
}catch (Exception e) {e.printStackTrace();}
//Do when JSON has problem.
}
I don't have time but tried to give an idea. If you still can't do it, then I will help.

you have an extra "}" in each object,
you may write the json string like this:
public class ShowActivity {
private final static String jString = "{"
+ " \"geodata\": ["
+ " {"
+ " \"id\": \"1\","
+ " \"name\": \"Julie Sherman\","
+ " \"gender\" : \"female\","
+ " \"latitude\" : \"37.33774833333334\","
+ " \"longitude\" : \"-121.88670166666667\""
+ " }"
+ " },"
+ " {"
+ " \"id\": \"2\","
+ " \"name\": \"Johnny Depp\","
+ " \"gender\" : \"male\","
+ " \"latitude\" : \"37.336453\","
+ " \"longitude\" : \"-121.884985\""
+ " }"
+ " }"
+ " ]"
+ "}";
}

How to add names of class and function automatically to my log

I'm using android.util.Log
class Foo
{
private void boo()
{
// This is the basic log of android.
Log.i("tag", "Start");
}
}
I want the log should be printed [Foo::boo] Start.
Can I get the class and function name in Java? Then how do I wrap the code?

here
UPDATED
String tag = "[";
tag += this.getClass().toString();
tag += " :: ";
tag += Thread.currentThread().getStackTrace()[1].getMethodName().toString();
tag += "]";
Log.i(tag, "Message");
this.getClass().toString() will return class name as String
UPDATE
if function is static then use following code
String tag = "[";
tag += Thread.currentThread().getStackTrace()[1].getClassName().toString();
tag += " :: ";
tag += Thread.currentThread().getStackTrace()[1].getMethodName().toString();
tag += "]";
Log.i(tag, "Message");

Get The Current Class Name and Function Name :
Log.i(getFunctionName(), "Start");
private String getFunctionName()
{
StackTraceElement[] sts = Thread.currentThread().getStackTrace();
if(sts == null)
{
return null;
}
for(StackTraceElement st : sts)
{
if(st.isNativeMethod())
{
continue;
}
if(st.getClassName().equals(Thread.class.getName()))
{
continue;
}
if(st.getClassName().equals(this.getClass().getName()))
{
continue;
}
return mClassName + "[ " + Thread.currentThread().getName() + ": "
+ " " + st.getMethodName() + " ]";
}
return null;
}

You can use these methods of java.lang.Class class
getClass().getname() - to get the name of the class
getClass().getMethods() - to get the methods declared in that class.