Develop Reference

count key value in JSON and extract values

I have following JSONObject (not array, which I don't mind to convert). I am trying to do two things:
get the count of genre entry as "poetry" (count = 2).
get the key value of author name and genre:
authorName = malcolm
genreName = newsarticle
authorName = keats
genreName = poetry
{ "AddressBook" :{
"Details" :{
"authorname" :{
"Author-malcolm":{
"genre" :"poetry"
}
"Author-keats":{
"genre" :"poetry"
}
}
}
}
}
Code which I tried:
public static void main(String[] args) throws Exception, IOException, ParseException {
JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader("My path to JSON"));
JSONObject jsonObject = (JSONObject) obj;
JSONArray arrayhere = new JSONArray();
arrayhere.add(obj);
System.out.println(arrayhere);
int count = 0;
for(int i = 0; i < arrayhere.size(); i++) {
JSONObject element = arrayhere.getJSONObject(i);//The method getJSONObject(int) is undefined for the type JSONArray
String branchName = element.getString("genre");//The method getString(String) is undefined for the type JSONObject
if(branchName.equals("poetry")) {
count ++;
}
}
System.out.println("Count f0r poetry genre=" + count);
}
}
I have looked at solutions all over. There is no question similar to this at stackoverflow. I am not sure if the procedure is correct.

A few problems here.
First, I'm not sure where you got that example JSON but you can't work with that. That's not even valid JSON Formatting.
Looks like you want something like this:
{
AddressBook:
[
{
authorname: "author-malcom",
genre:"poetry"
},
{
authorname: "author-keats",
genre: "poetry"
}
]
}
That's the structure you're trying to create in JSON.
So, you're parsing this in from a file into a JSONObject that has a key called AddressBook inside of it. That key points to an array of JSONObjects representing authors. Each of those objects will have a key called genre. You're trying to access the genre key and count on a condition.
What you did above was create attempt to create a JSONObject from an invalid string, and then add the entire JSONObject itself into the JSONArray. JSONArray.add() doesn't convert an object to an array, it literally adds it onto the array.
jsonObj => {"Name":"name1","Id":1000}
jsonArray.add(jsonObj)
jsonArray => [{"Name":"name1","Id":1000}]
That's what you did in your code above. You didn't create an array from a JSONObject, you added an object to the array.
Proper use is going to look like:
Object obj = parser.parse(new FileReader("path_to_file"));
JSONObject jobj = (JSONObject) obj;
//access key AddressBook
JSONArray author_array = jobj.getJSONArray("AddressBook");
int poetry = 0;
for(int i = 0; i < author_array.length(); i++) {
JSONObject author = (JSONObject) author_array.get(i);
if(author.getString("genre").equals("poetry")) {
poetry++;
}
}
To summarize, you're problems come from a lack of understanding about JSON Formatting and how to access elements within a JSON Object.
Paste in the sample JSONObject I gave you above here. That site will let you visualize what you're working with.

Google Places detail "photos[]" jsonarray is always null

So I get place_id by storing it in a Hashmap with the "name" of the place as the key.
private HashMap<String, String> placeTitleId = new HashMap<>();
if (!place.isNull("place_id")) {
placeId = place.getString("place_id");
placeTitleId.put(name, placeId);
}
Later, I create the Places Detail search url:
private String createPlaceDetailsUrl(String placeId) {
StringBuilder stringBuilder = new StringBuilder("https://maps.googleapis.com/maps/api/place/details/json?");
stringBuilder.append("placeid=").append(placeId);
stringBuilder.append("&key=").append(GOOGLE_PLACES_API_KEY);
return stringBuilder.toString();
}
Finally, I parse the json response:
JSONObject data = new JSONObject(result);
if (data.getString("status").equalsIgnoreCase("OK")) {
JSONArray photoArray = data.getJSONArray("photos");
}
What I don't understand is why the "photos" json array has no value
Android Monitor: W/System.err: org.json.JSONException: No value for photos
The documentation says that the photos[] jsonarray should have up to 10 photos. However, the json output schema does not contain a photos[] object, which I find weird. Is there a problem with how I am obtaining place_id or parsing the response?
EDIT:
The "result" String is incredibly long, but I can provide a gist:
result {
"address components" : [
*bunch of stuff*
]
...
"geometry" : {
*bunch of stuff*
}
"icon"
"id"
"photos" : [
{
"height"
"html_attributions:
"photo_reference!!
}
{
...
"photo_reference!!
}
*bunch more of these*
]
}
EDIT:
Fix is getting json object "result
JSONObject jsonObject = new JSONObject(result);
JSONObject data = new JSONObject("result");
The data object has "pictures"

Try this.
JSONObject data = new JSONObject(result);
// add log here ,make sure you have photos in your result
Log.e("result", result + "");
if (data.getString("status").equalsIgnoreCase("OK")) {
// edited here
JSONArray photoArray = data.optJSONArray("photos");
}
Edit
if (data .has("photos")) {
Log.e("photos", "photos exists");
} else {
Log.e("photos", "photos not exists");
}
Use data .has("photos") in your code and judge it .
Note
Use
JSONObject data = new JSONObject(result);
if(data.has("TAG")){
// if has it in your data,do something
}
to determine whether this tag is present in the data

Get dynamically list of object using json.simple

Asking after searching and trying many examples .
I'm trying to dynamically get list of values from json in order to insert into array .
The json looks like :
{
"Test_name":"mft",
"parameters":[
{
"Remotehost":"vl-tlv-ctm-qa22",
"Ftptype":"sftp",
"file_name":"blabla.txt"
}
]
}
i'm using the following code :
JSONParser parser = new JSONParser();
try {
Object obj = parser.parse(new FileReader("c:/temp/test.txt"));
JSONObject jsonObject = (JSONObject) obj;
String testname = (String) jsonObject.get("Test_name");
System.out.println(testname)
JSONArray msg = (JSONArray) jsonObject.get("parameters");
Iterator<JSONObject> iterator = msg.iterator();
while (iterator.hasNext()) {
JSONObject factObj = (JSONObject) iterator.next();
System.out.println(factObj);
the output is :
mft
{"Remotehost":"vl-tlv-ctm-qa22","file_name":"blabla.txt","Ftptype":"sftp"}
how do i break the pairs in the nested so i can use the as variables and not as single line ?
Thanks ,
Zohar

You can get the pairs as key-value pair from JSONObject as below:
while (iterator.hasNext()) {
JSONObject factObj = (JSONObject) iterator.next();
for (Object key : factObj.keySet()) {
System.out.println(key+":"+factObj.get(key));
}
}

Error parsing the JSON file using Java

I am getting the error while parsing the the following JSON file. If anybody please help me out, highly appreciated!
{"Name":"Abc", "Author":"fgd", "Company List":{"Company":"C1","Companyone":"Compa2"}}
Here is my code:-
JSONParser parser = new JSONParser();
try {
Object obj = parser.parse(new FileReader("/Users/abcdefgh/Documents/File1.txt"));
JSONObject jsonObject = (JSONObject) obj;
String name = (String) jsonObject.get("Name");
String author = (String) jsonObject.get("Author");
System.out.println("Name: " + name);
System.out.println("Author: " + author);
// JSONArray companyList= new JSONArray();
//companyList.add(obj);
JSONArray companyList = (JSONArray) jsonObject.get("Company List");
System.out.println("Company List:");
/* for (int i=0;i<2;i++){
System.out.println(companyList.get(i));
}
*/Iterator<String> iterator = companyList.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}
Output:-
Name: Abc
Author: fgd
java.lang.ClassCastException: org.json.simple.JSONObject cannot be
cast to org.json.simple.JSONArray at
com.selenium.test.JSONRead.main(JSONRead.java:29)

The property type of "Company List" property is object, not an array.
Replace the line
JSONArray companyList = (JSONArray) jsonObject.get("Company List");
for:
JSONObject companyList = jsonObject.getJSONObject("Company List");
If you want to get the values ​​of this object, you can do the following:
JSONObject companyList = jsonObject.getJSONObject("Company List");
String company = companyList.getString("Company");
And remember to get the value of a property of a JSONObject which is an array, you must use the method getJSONArray.

companyList is a JSON Object, not an array. That's why you are getting that class cast exception.

Parse json array from webserver

I'm going to parse a json array from web server to android app.The array looks like this
{"Level":
[
{"route":[{"lat":38.889762,"lgn":-77.081764},
{"lat":38.89096,"lgn":-77.081916}]},
{"route":[{"lat":38.889762,"lgn":-77.081764},
{"lat":38.89096,"lgn":-77.081916}]},
{"route":[{"lat":38.889762,"lgn":-77.081764},
{"lat":38.89096,"lgn":-77.081916}]}
]
}
my java code is
JSONObject json = new JSONObject(result);
JSONArray jArray = json.getJSONArray("Level");
rlevel = new ArrayList<LatLng>();
System.out.println("*****JARRAY*****"+jArray.length());
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
jlat = json_data.getDouble("lat");
jlgn = json_data.getDouble("lgn");}
but not works! any idea?after this i want to save each route into an array (etc $plan[1]=first route from json, $plan[2]=second route from json)

Try something like this:
//code is a String where you saved the json
JSonObject json= new JsonParser().parse(code).getAsJsonObject();
JsonArray jArray= json.getAsJsonArray("Level");
rLevel=new ArrayList<LatLng>();
//notice the use of the size() method. There is not length() method defined for ArrayList
System.out.println("*****JARRAY*****"+jArray.size());
for(int i=0;i<jArray.size();i++){
//notice that inside the Level Array you have route-arrays
JSonObject level_item = jArray.get(i).getAsJsonObject();
JSonArray route= level_item.getAsJSonArray("route");
//now I don't know exactly what data you want to extract, since there are 2
//pairs of LatLng, for the first one:
jlat = route.get(0).get("lat").getAsDouble();
jlgn= route.get(0).get("lgn").getASDouble();
The exact names for methods and JsonObjects tend to differ from a library to another, but the principle is the same.

This parse task can be done very easily using droidQuery:
try {
JSONObject json = $.parseJSON(result);
if (json.has("Level")) {
Object[] datas = $.makeArray(json.getJSONArray("Level"));
for (Object data : datas) {
JSONObject obj = (JSONObject) data;
Object[] coordinates = $.makeArray(obj.getJSONArray("route"));
for (Object coord : coordinates) {
Map<String, ?> map = $.map((JSONObject) coord);
double latitude = (Double) map.get("lat");
double longitude = (Double) map.get("lgn");
//TODO: do something with these values
}
}
}
else {
Log.d("JSON", "Result does not contain 'Levels' variable");
}
}
catch (Throwable t) {
t.printStackTrace();
}