Trying to get a random word from this JSON file
public class Main {
public static void main(String[] args) {
JSONObject obj = JSONUtils.getJSONObjectFromFile("/adjs.json");
JSONArray jsonArray = obj.getJSONArray("adjs");
for(int i = 0; i < jsonArray.length(); i++) {
System.out.println(jsonArray.get(i));
}
Random r = new Random();
int id1 = r.nextInt(jsonArray.length());
String word1 = jsonArray.getJSONObject(id1).getString("adjs");
System.out.println(word1);
//String word = jsonArray.getJSONObject(r.nextInt(jsonArray.length())).getString("adjs");
}
}
There is the code I am using and I keep getting this error.
Exception in thread "main" org.json.JSONException: JSONArray[671] is not a JSONObject.
at org.json.JSONArray.getJSONObject(JSONArray.java:428)
at Job.Main.main(Main.java:23)
How can I achieve it?
Below is the JSON I'm working with:
{
"description": "A list of English adjectives.",
"adjs":
[
"Aristotelian",
"Arthurian",
"Bohemian",
"Brethren",
"Mosaic",
"Oceanic",
"Proctor",
"Terran",
"Tudor",
"abroad",
"absorbing",
"abstract",
"academic",
"accelerated",
"accented",
"accountant",
"acquainted",
"acute",
"addicting",
"addictive",
"adjustable",
"admired",
"adult",
"adverse",
"advised"
]
}
Looking for ways around it. Oh yea is just a little bit of the JSON file.
String word1 = jsonArray.getJSONObject(id1).getString("adjs");
The variable jsonArray contains a JSONArray, which contains strings, not nested JSONObjects. What you want is
String word1 = jsonArray.getString(id1);
The code you actually wrote expects JSON in the following form:
{
"description": "A list of English adjectives.",
"adjs":
[
{ "adjs": "Aristotelian" },
{ "adjs": "Arthurian" },
...
]
}
Mentioning the key "adjs" twice in your code could have been a clue :-)
Related
I need to read a JSON file with following form:
{
"Data":[{
"foo":"22",
"bar":"33",
"array":[
{
"1foo":"22",
"1bar":"33"
},
{
"2foo":"22",
"2bar":"33",
}
],
"anotherData":{
"foofoo":"22",
"barbar":"33"
},
"some more data":"11",
"some more data":"11"
},
{and the cycle here starts again from -->
"foo":"22",
"bar":"33",
"array":[
My question stands : How do I access individual elements given it's sometimes JSONObject and sometimes JSONArray. I tried using org.json library but I'm failing to access anything after this line -> "array":[. I tried various combinations of JSONObject and JSONArray up to no avail.
My latest code looked something like this:
List<Data> data= new ArrayList<>();
String rawJson = getJsonAsString();
JSONObject outer = new JSONObject(rawJson);
JSONArray jArr= outer.getJSONArray("Data");
JSONObject inner= outer.getJSONObject("array");
for(int i =0; i<jArr.length(); i++){
JSONObject jsonEvent = jArr.getJSONObject(i);
String foo = jsonEvent.getString("foo"); <-- this works,
String 1foo = jsonEvent.getString("1foo"); <-- but this doesn't and i cant access it
I tried dozens of different solutions(tried myself and tried to find something here as well, but every case with those nested arrays is different and I can't add those solutions together to get answer for my case)
You can increase your readability if you beautify your raw JSON string:
{
"Data":[
{
"foo":"22",
"bar":"33",
"array":[
{
"1foo":"22",
"1bar":"33"
},
{
"2foo":"22",
"2bar":"33"
}
],
"anotherData":{
"foofoo":"22",
"barbar":"33"
},
"some more data":"11",
"some more data":"11"
},
{ and the cycle here starts again from -->
"foo":"22",
"bar":"33",
"array":[
...
],
...
}
]
}
So, stick to the following code:
JSONArray jArr = outer.getJSONArray("Data");
jArr is now filled with array of your Object.
And to loop through your Object array, you can use a for-loop which you have done it correctly.
for (int i = 0; i < jArr.length(); i++) {
// The below gets your Object
JSONObject jsonEvent = jArr.getJSONObject(i);
}
And now each jsonEvent contains your Object, which you can access the Object by their type.
For example, if you would like to access foo, you can use:
String foo = jsonEvent.getString("foo"); // foo = "22"
String bar = jsonEvent.getString("bar"); // bar = "33"
// Note that your array is another Array, you need to get it as JSONArray first
JSONArray arrayJson = jsonEvent.getJSONArray("array");
And as 1foo is in the first Object for your array, you need to access it like this:
JSONObject firstObjectInArray = arrayJson.getJSONObject(0);
String target = firstObjectInArray.getString("1foo"); // target = "22"
And to access foofoo, as it is an attribute of the JSON Object anotherData, so you should obtain anotherData as JSONObject first, and then you can access foofoo:
JSONObject anotherDataObject = jsonEvent.getJSONObject("anotherData");
String foofoo = anotherDataObject.getString("foofoo"); // foofoo = "22"
So the full code within your for-loop should look like this:
for (int i = 0; i < jArr.length(); i++) {
// The below gets your Object
JSONObject jsonEvent = jArr.getJSONObject(i);
String foo = jsonEvent.getString("foo");
JSONArray arrayJson = jsonEvent.getJSONArray("array");
String target = arrayJson.getJSONObject(0).getString("1foo");
// Add to get foofoo
JSONObject anotherDataObject = jsonEvent.getJSONObject("anotherData");
String foofoo = anotherDataObject.getString("foofoo");
}
I have problems with my code, I need to extract the "materias" markup in the arraylist. Example data:
[{
"name": "A114",
"grupo": "DAW2",
"tutor": 15,
"materias": ["DWES", "DWEC", "IW", "DAW", "IE"]
}]
I tried this, work but i need the content of the arraylist:
try { // this read the JSON file
line = new String(Files.readAllBytes(Paths.get("fileAulas")));
} catch (Exception ex) {
ex.printStackTrace();
}
JSONArray recs = new JSONArray(line);
for (Object rec : recs) {
Aula datos = new Aula();
JSONObject obj = ((JSONObject) rec);
String name = obj.getString("name");
//datos.setNombre(name);
String grupo = obj.getString("grupo");
//datos.setGrupo(grupo);
int tutor = obj.getInt("tutor");
//datos.setTutor(tutor);
}
My objetive is to read the arraylist and then datos.setArraylist to my another class. All works fine except read the arraylist
PD: I use java downloaded from Maven, to execute i use "javac -cp ./*: program.java"
materias is also an array, so you need something like:
JSONArray materias = obj.getJsonArray("materias");
List<String> materiasList = materias.getValuesAs(String.class);
This is not type-safe so you need to make sure the array will only have String values.
Also, if you are using Java 8, you can iterate over the values and store them manually (JsonArray is also a Collection<JsonValue>)
Quickly created short test implementation of your needs:
String json = "[{ \"name\":\"A114\",\"grupo\": \"DAW2\",\"tutor\":15,\"materias\": [\"DWES\",\"DWEC\",\"IW\",\"DAW\",\"IE\"]}]";
JSONArray objectArray = new JSONArray(json);
for (int x = 0; x < objectArray.length(); x++) {
JSONObject obj = objectArray.getJSONObject(x);
System.out.println("Name: " + obj.get("name"));
System.out.println("Grupo: " + obj.get("grupo"));
System.out.println("Tutor: " + obj.get("tutor"));
JSONArray materias = obj.getJSONArray("materias");
for (int y = 0; y < materias.length(); y++) {
System.out.println("Materia " + y + ": " + materias.get(y));
}
}
Output
Name: A114
Grupo: DAW2
Tutor: 15
Materia 0: DWES
Materia 1: DWEC
Materia 2: IW
Materia 3: DAW
Materia 4: IE
First gotta make your JSON Valid.
[{
"name": "A114",
"grupo": "DAW2",
"tutor": 15,
"materias": ["DWES", "DWEC", "IW", "DAW", "IE"]
}]
Secondly, you can try the following :
for (JsonElement rec : recs) {
Aula datos = new Aula();
JSONObject obj = rec.getAsJsonObject();
String name = obj.get("name").getAsString();
//datos.setNombre(name);
String grupo = obj.get("grupo").getAsString();
//datos.setGrupo(grupo);
int tutor = obj.get("tutor").getAsInt();
JsonObject obj = rec.getAsJsonObject();
JsonArray materias = obj.getAsJsonArray("materias");
List<String> materiasList = new ArrayList<>();
for (JsonElement item:
materias) {
materiasList.add(item.getAsString());
}
}
I believe that the syntax for an array in json is different that what you have in your file. For example - a simple complete json that contains an array of simple elements would be:
{"contacts":[
{ "firstName":"John", "lastName":"Doe" },
{ "firstName":"Jen", "lastName":"Smith" },
{ "firstName":"David", "lastName":"Jones" }
]}
In your text, you specify an array, without the opening and closing JSON '{' and '}'. Also, You would need to name the array element ("contacts" in the example above). I think that what you want would be (I used "arrayName" for the array element name):
{"arrayName":[{ "name":"A114","grupo": "DAW2","tutor":15,"materias":["DWES","DWEC","IW","DAW","IE"] },
{ "name":"121","grupo": "DAW1","tutor":8,"materias":["PROGRA","BD","SIS","LM","FOL"] },
{ "name":"A112","grupo": "AUTO1","tutor":5 },
{ "name":"A127","grupo": "ASIR1","tutor":2 },
{ "name":"A114","grupo": "SMR2","tutor":11 },
{ "name":"A128","grupo": "ASIR2","tutor":9,"materias":["IAW","ABD","ASIS","SI","IE"] },
{ "name":"A125","grupo": "ADM2","tutor":12 } ] }
I have a JSONArray which contains multiple JSONObjects
[
{
"record":[
{
"timeStamp":"2018-10-11T05:36:51+00:00",
"code":200,
"text":"OK"
},
{
"hostname":"qwe",
"address":"192.168.1.1",
"type":"A",
"priority":"0",
"ttl":"3600"
},
{
"hostname":"www",
"address":"test.com",
"type":"CNAME",
"priority":"0",
"ttl":"3600"
}
]
},
{
"record":[
{
"timeStamp":"2018-10-11T05:36:52+00:00",
"code":200,
"text":"OK"
},
{
"hostname":"rty",
"address":"192.168.1.2",
"type":"A",
"priority":"0",
"ttl":"300"
},
{
"hostname":"*",
"address":"test",
"type":"CNAME",
"priority":"0",
"ttl":"3600"
}
]
}
]
How can I parse this JSONArray and export it as a CSV File.
This is what I have tried so far
File file=new File("/home/administrator/Desktop/test.csv");
String csv = jsonArray;
FileUtils.writeStringToFile(file, csv);
System.out.println("CSV created.");
My desired output is
timeStamp,code,text,hostname,address,type,priority,ttl,hostname,address,type,priority,ttl
2018-10-11T05:36:51+00:00,200,OK,qwe,192.168.1.1,A,0,300,www,test.com,CNAME,0,3600
2018-10-11T05:36:52+00:00,200,OK,rty,192.168.1.2,A,0,300,*,test,CNAME,0,3600
Is it possible to have an output like this given the JSONArray above?
Sorry for the late respond was bashing my keyboard for the past 30 minutes but I finally got it done, here is the code.
public static String getCSVData() throws IOException, JSONException {
Path jsonFile = Paths.get("json");
String json = new String(Files.readAllBytes(jsonFile), StandardCharsets.UTF_8);
JSONArray jsonArray = new JSONArray(json.trim());
List<List<String>> jsonArrays = new ArrayList<>();
for (int i = 0; i < jsonArray.length(); i++) {
List<String> jsonObjects = new ArrayList<>();
JSONArray record = jsonArray.getJSONObject(i).getJSONArray("record");
for (int i2 = 0; i2 < record.length(); i2++) {
JSONObject jsonObject = record.getJSONObject(i2);
if (i2 == 0) {
jsonObjects.add(jsonObject.get("timeStamp").toString());
jsonObjects.add(jsonObject.get("code").toString());
jsonObjects.add(jsonObject.get("text").toString());
} else {
jsonObjects.add(jsonObject.get("hostname").toString());
jsonObjects.add(jsonObject.get("address").toString());
jsonObjects.add(jsonObject.get("type").toString());
jsonObjects.add(jsonObject.get("priority").toString());
jsonObjects.add(jsonObject.get("ttl").toString());
}
}
jsonArrays.add(jsonObjects);
}
StringBuilder stringBuilder = new StringBuilder("timeStamp,code,text,hostname,address,type,priority,ttl,hostname,address,type,priority,ttl\n");
for(List<String> arrays : jsonArrays){
stringBuilder.append(StringUtils.join(arrays, ",")).append("\n");
}
return stringBuilder.toString().trim();
}
To explain the code first I looped over the first Array and then get the jsonObject of the first JSONArray and then get the jsonArray named "record" from the JsonObject I have gotten by looping over the first JSONArray and then loop over record and get all the items and save them into an ArrayList. and join them via StringUtils which is provided by JDK.
if you want to write it to file use this
Files.write(Paths.get("YOUR CSV FILE"), getCSVData().getBytes(StandardCharsets.UTF_8));
all the code I used are provided by JDK and org.json.
after we print out getCSVDate(); the output is:
timeStamp,code,text,hostname,address,type,priority,ttl,hostname,address,type,priority,ttl
2018-10-11T05:36:51+00:00,200,OK,qwe,192.168.1.1,A,0,3600,www,test.com,CNAME,0,3600
2018-10-11T05:36:52+00:00,200,OK,rty,192.168.1.2,A,0,300,*,test,CNAME,0,3600
I am not able to format below string :
"Sony,20,30,40;LG,1,4,8"
In below JSON format:
"reported": {
"SETS": [
{
"prodName": "Sony",
"fmtd": "20",
"lmtd": "30",
"lm": "40"
},
{
"prodName": "LG",
"mtd": "1",
"lmtd": "4",
"lm": "8"
}
]
}
I tried below code but not getting proper results.
String stringFromProc = "SONY,20,30,40;LG,1,4,8";
String[] array1 = stringFromProc.split("[\\;]");
JSONObject jsonSubObject = null;
JSONObject jsonFinal = new JSONObject();
JSONArray jsonArrayRET = new JSONArray();
for(int i=0;i<array1.length;i++){
String []array2 = array1[i].split("[\\,]");
for(int j=0;j<array2.length;j++){
System.out.println(array2[j]);
jsonSubObject = new JSONObject();
jsonSubObject.put("prodName", array2[0]);
jsonSubObject.put("mtd", array2[1]);
jsonSubObject.put("lmtd", array2[2]);
jsonSubObject.put("lm", array2[3]);
jsonArrayRET.add(jsonSubObject);
jsonFinal.put("reported", jsonArrayRET);
}
}
But getting this format:
{"SETS":[{"lm":"40","lmtd":"30","mtd":"20","prodName":"MNP"},{"lm":"40","lmtd":"30","mtd":"20","kpiName":"MNP"},{"lm":"40","lmtd":"30","mtd":"20","kpiName":"MNP"},{"lm":"40","lmtd":"30","mtd":"20","kpiName":"MNP"},]}
I know that I am making loop after splitting the comma separated array but not able to get the correct approach of how to split. Someone please suggest.
Just remove the internal loop
String stringFromProc = "SONY,20,30,40;LG,1,4,8";
String[] array1 = stringFromProc.split(";"); // simply use ;
// array1[0] = SONY,20,30,40
// array1[1] = LG,1,4,8
JSONObject jsonSubObject = null;
JSONObject jsonFinal = new JSONObject();
JSONArray jsonArrayRET = new JSONArray();
for(int i=0;i<array1.length;i++){
String []array2 = array1[i].split(","); // simply use ,
// create jsonobjects
// when i=0 mean for sony and next time i = 1 mean for LG
jsonSubObject = new JSONObject();
jsonSubObject.put("prodName", array2[0]);
jsonSubObject.put("mtd", array2[1]);
jsonSubObject.put("lmtd", array2[2]);
jsonSubObject.put("lm", array2[3]);
// put every object in array
jsonArrayRET.add(jsonSubObject);
}
// finally put array in reported jsonobject
jsonFinal.put("reported", jsonArrayRET);
Note : ; and , are not special regular expressions characters so no escaping \\ is required and instead of long info just read about character class []
Move
jsonFinal.put("reported", jsonArrayRET);
outside of 2nd loop, you are overwritting reported object.
for(int i=0;i<array1.length;i++){
String []array2 = array1[i].split("[\\,]");
for(int j=0;j<array2.length;j++){
System.out.println(array2[j]);
jsonSubObject = new JSONObject();
jsonSubObject.put("prodName", array2[0]);
jsonSubObject.put("mtd", array2[1]);
jsonSubObject.put("lmtd", array2[2]);
jsonSubObject.put("lm", array2[3]);
jsonArrayRET.add(jsonSubObject);
}
jsonFinal.put("reported", jsonArrayRET);
}
i'm creating a mcq for a medical application and i'm trying to get some question from my databse with the different choice with this JSON :
{
"QCM": [{
"question": "Est-ce que Guillaume a pris?",
"id": "34",
"choix": ["Oui", "Non"]
}]
}
then i past my question string to a textview and if i have 2 choice, i create only 2 button, but only 1 button is create and in my button i have this string :
["Oui", "Non"]
So i don't understand because i create a second JSONArray loop for it ...
Here is my Java
try
{
JSONArray QCM = response.getJSONArray("QCM");
for (int i=0; i<QCM.length(); i++) {
JSONObject getQcmObject = QCM.getJSONObject(i);
String questionGet = getQcmObject.getString("question");
symptomesQuestions.setText(questionGet);
for (int x=0; x<QCM.length(); x++){
JSONObject getChoixObject = QCM.getJSONObject(x);
String choiceGet = getChoixObject.getString("choix");
lesChoixButton.setText(choiceGet);
}
}
If someone can explain me how to do it, i want to learn ! can't find any exemple for this kind of request.
Thanks folks !
you use wrong parser ,change it like this:
JSONArray QCM = response.getJSONArray("QCM");
for (int i = 0; i < QCM.length(); i++) {
JSONObject getQcmObject = QCM.getJSONObject(i);
String questionGet = getQcmObject.getString("question");
symptomesQuestions.setText(questionGet);
JSONArray choiceGet = getChoixObject.getJSONArray("choix");
lesChoixButton1.setText(choiceGet.getString(0));
lesChoixButton2.setText(choiceGet.getString(1));
}
use this site to create java pojo model from your json : http://www.jsonschema2pojo.org/