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JSON object is getting removed with remove method in JSON file instead of JSON array [duplicate]

This question already has answers here:
How to remove an element from JSON string in Java?
(2 answers)
Closed 6 months ago.
I am trying to remove JSON array from a JSON file using org.json library
I am trying to remove webAutomation JSON array from the JSON file as follows
{
"instructor": "Test_Instructor",
"url": "www.google.com",
"services": "Test Automation Service",
"expertise": "Testing",
"linkedIn": "linkedIn",
"courses": {
"webAutomation": [
{
"price": "500",
"courseTitle": "Selenium"
},
{
"price": "333",
"courseTitle": "Protractor"
}
],
"apiAutomation": [
{
"price": "344.00",
"courseTitle": "Rest Assured API Automation"
}
],
"mobileAutomation": [
{
"price": "4555",
"courseTitle": "Appium"
}
]
}
}
I tried following code. Here str has JSON file
JSONObject jsonObject = new JSONObject(str);
jsonObject.getJSONObject("courses").getJSONArray("webAutomation");
System.out.println("after removal");
String str2 = mapper.writeValueAsString(jsonObject);
System.out.println(str2);
This is removing the whole JSON object instead of just JSON Array.
The output is {"empty":false}
Please help

You can use remove method in org.json.JSONObject#remove.
JSONObject json = new JSONObject(str);
json.getJSONObject("courses").remove("webAutomation");
System.out.println(json);
The output will be:
{
"instructor": "Test_Instructor",
"url": "www.google.com",
"services": "Test Automation Service",
"expertise": "Testing",
"linkedIn": "linkedIn",
"courses": {
"apiAutomation": [
{
"price": "344.00",
"courseTitle": "Rest Assured API Automation"
}
],
"mobileAutomation": [
{
"price": "4555",
"courseTitle": "Appium"
}
]
}
}

What is the best way to extract data from this JSON string? [duplicate]

I have some trouble with parsing a JSON response. The response data:
{
"deal": {
"categorie": {
"description": "Offres Shopping",
"idcategorie": "1",
"nom": "Shopping"
},
"conditions": "2 personne au plus",
"dateAjout": "2013-01-07T00:00:00+01:00",
"dateExp": "2013-01-31T00:00:00+01:00",
"description": "nuit dans un hotel 5 etoile",
"heurexp": "12",
"iddeal": "1",
"minutesexp": "30",
"prestataire": {
"adresse": "Qu zohour 44",
"codePostale": "12600",
"description": "Hotel 5 etoiles",
"idprestataire": "1",
"nom": "Hotel ronald",
"pays": "France",
"telephone": "99999999",
"ville": "Brest"
},
"prix": "80.0",
"prixHabituel": "200.0",
"tags": "hotel",
"titre": "Nuit 5 etoiles"
}
}
When trying to parse this response to a List<Deal> I get this exception:
com.google.gson.JsonObject cannot be cast to com.google.gson.JsonArray
This is the code that I am using for the parse:
if (reponse != null && !reponse.isEmpty()) {
System.out.println(reponse);
Gson g = new Gson();
JsonParser parser = new JsonParser();
JsonObject jObject = parser.parse(reponse).getAsJsonObject();
JsonArray jArray = jObject.getAsJsonArray("deal"); // here goes the Exception
for (JsonElement elem : dealArray) {
deals.add(g.fromJson(elem, Deal.class));
}
System.out.println(deals.toString());
return "success";
}
thanks

Well, deal is not a JSON array, its a JSON object. Hence the exception. A JSON array, for reference, would look more like this:
"deal" : [{"attr" : "value"}, {"attr" : "value"}]

The sum of several items in a json

I have a JSON source with more empty_slots elements (in the example exist below only one, but in the reality exist more stations with empty_slots). How can I sum the values from empty_slots and return as double? Thanks!
JAVA
public static double getValueFromJSONString(String jString) throws JSONException
{
JSONObject json = new JSONObject(jString);
return json.getJSONObject("empty_bikes").getDouble(jString);
}
JSON
{"network": {
"company": [
"Gewista Werbegesellschaft m.b.H"
],
"id": "citybike-wien",
"location": {
"city": "Wien",
},
"stations": [
{
"empty_slots": 3,
"extra": {
"slots": "26",
},
"free_bikes": 23
}]}

Checkout JsonPath. Below code is not tested but should work with RestAssured dependency - https://github.com/rest-assured/rest-assured
JsonPath jsonPath = new JsonPath(jsonString);
List<Integer> companyEntityIds = jsonPath.getList("network.stations.empty_slots");
Once you have the array you can just use a stream or whatever to add these up.

Parsing Chrome Bookmarks Json file : Java

Currently I am using netbeans IDE. I tried using other solution, but to no luck so far.
Problem is, i am facing errors when trying to read the Json file from google Chrome bookmarks file (C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Bookmarks)
p/s: although there is no file type written in the name of Bookmarks, its content have been known as JSON
This is the what inside the Bookmarks.json:
{
"checksum": "20fdfad51db6d3199f8a09c3220dd93b",
"roots": {
"bookmark_bar": {
"children": [ {
"date_added": "13124893413824227",
"id": "6",
"name": "YouTube",
"type": "url",
"url": "https://www.youtube.com/"
}, {
"date_added": "13124893435163243",
"id": "7",
"name": "Welcome to Facebook",
"type": "url",
"url": "https://www.facebook.com/"
} ],
"date_added": "13124893381424539",
"date_modified": "13124893435163243",
"id": "1",
"name": "Bookmarks bar",
"type": "folder"
},
"other": {
"children": [ ],
"date_added": "13124893381424547",
"date_modified": "0",
"id": "2",
"name": "Other bookmarks",
"type": "folder"
},
"synced": {
"children": [ ],
"date_added": "13124893381424550",
"date_modified": "0",
"id": "3",
"name": "Mobile bookmarks",
"type": "folder"
}
},
"version": 1
}
And here is my code (JsonParser.java):
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
public class JsonParser{
private static String jsonFile = "C:\\Users\\Admin\\AppData\\Local\\Google\\Chrome\\User Data\\Default\\Bookmarks";
public static void main (String[] args) {
try {
FileReader reader = new FileReader (jsonFile); //access the file
JSONObject jsonObject = (JSONObject) new JSONParser().parse(reader);
String c =(String) jsonObject.get("checksum"); //place
// String r =(String) jsonObject.get("roots"); //place
// String r =(String) jsonObject.get("children"); //place
System.out.println("check: " + c);
//System.out.println("roots: " + r);
JSONArray lang = (JSONArray) jsonObject.get("roots");
for (int i=0; i<lang.size(); i++) {
System.out.println ("Url Name : " + lang.get(i)+"\n");
} //data in the array
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}
}
}
For some reason when I run the code these are the errors I got:
check: 4d55f8a0888f7dd918a702eda2821ccd
Exception in thread "main" java.lang.ClassCastException: org.json.simple.JSONObject cannot be cast to org.json.simple.JSONArray
at JsonParser.main(JsonParser.java:28)
C:\Users\Admin\Documents\NetBeansProjects\Keep-It\nbproject\build-impl.xml:1051: The following error occurred while executing this line:
C:\Users\Admin\Documents\NetBeansProjects\Keep-It\nbproject\build-impl.xml:805: Java returned: 1
BUILD FAILED (total time: 2 seconds)
As you can see, only checksum succeed in being read, but the roots failed and gave out these errors.
You should also notice that there are some codes I put as comments, those are things i tried but still got the errors.
I hope anyone can help me to get these things working.
Thank you very much for helping

Issue is , you cannot cast object to array like (JSONArray) jsonObject.get("roots"); you have to follow the structure so parse according to object and array as shown below
JSONObject jsonObject = (JSONObject) new JSONParser().parse(reader);
String checksum =jsonObject.optString("checksum");
// get root object
JSONObject root = jsonObject.getJSONObject("roots");
// get root bookmarks object from root
JSONObject bookmarks = root.getJSONObject("bookmark_bar");
// get root children array from bookmarks
JSONArray childrens = bookmarks.getJSONArray("children");
JSONObject temp ;
for (int i=0; i<childrens.size(); i++) {
// get object using index from childrens array
temp = childrens.getJSONObject(i);
// get url
String url = temp.optString("url");
}
as your structure follow
JObject => root
root JSONObject has : bookmark_bar JSONObject
bookmark_bar JSONObject has : children JSONArray
children JSONArray has JSONObject which further has String: url

roots is not a JSONArray but a JSONObject.
So what you have to do is
JSONObject lang = jsonObject.get("roots");
and then you have too loop through all keys in the object which should be:
bookmark_bar
other
synced

It seems to me like "roots" is not an array, but an object when looking at the JSON. "children" under "bookmark_bar" is an array however

Unable to get specific data from a JSON object

I am trying to extract specific data from a json response using org.json.JSONObject library
Heres is my json response :
{
"facets": {
"application": [
{
"name": "38",
"distribution": 1
}
],
"node": [
{
"name": "frstlwardu03_05",
"distribution": 1
}
],
"area": [
{
"name": "x",
"distribution": 1
}
],
"company": [
{
"name": "war001",
"distribution": 1
}
]
},
"duObjects": [
{
"id": "TASK|TSK(ZRM760J)(000)(ZRM760JU00)(000)|ZSRPSRM000",
"name": "TSK(ZRM760J)(000)(ZRM760JU00)(000)",
"mu": "ZSRPSRM000",
"label": "",
"session": "ZRM760J|000",
"sessionLabel": "SAP SRM Achats frais generaux execution",
"uprocHeader": "ZRM760JU00|000",
"uprocHeaderLabel": "Header for SRM760J",
"uprocHeaderType": "CL_INT",
"domain": "M",
"domainLabel": "",
"application": "38",
"applicationLabel": "magasin",
"highlightResult": {
"name": "name",
"word": "TSK"
}
}
],
"totalCount": 1,
"pageSize": 10,
"pageCurrent": 1,
"pageNb": 1
}
Here is the method I used to convert the URL call to a jsonobject :
public static JSONObject readJsonFromUrl(String url) throws IOException, JSONException
{
InputStream is = new URL(url).openStream();
try {
BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-
8")));
String jsonText = readAll(rd);
JSONObject json = new JSONObject(jsonText);
return json;
} finally {
is.close();
}
}
When I call this method I am able to get the data in teh Duobject :
public static void main(String[] args) throws IOException, JSONException {
JSONObject json = readJsonFromUrl("http://frstmwarwebsrv.orsyptst.com:9000/duobject?
searchString=TSK(ZRM760J)(000)(ZRM760JU00)
(000)&filterchecks=nameJob,nameWF,nameSWF,application,domain&p.index=0&p.size=10");
System.out.println(json.getJSONArray("duObjects"));
}
Is there anyway I can extract only the name field of the DuObjects?

You can use
System.out.println(json.getJSONArray("duObjects").getJSONObject(0).getString("name"));
to get the name.

1 : your complete response is a JSON OBJECT
2 : if any element is written like
"some key name " : { " some value " }
this is a JSON Object
3 : if any element is writen like
"some key name " : " some value "
this is value inside you json object which you can get by
jsonObject.getString("key name")
4 : if any element is writen like
"some key name " : [ " some value " ]
then this is a JSON Array and you have to take it in to a JSON ARRAY and then traverse its elements by
jsonObject.getJSONARRAY("key name for JSON ARRAY IN RESPONSE ")
and then you can traverse the elements of the JSON ARRAY by
`jsonArrayObj.get(0);`

You can use Jackson libraries to covert to java. Jackson api provides annotation level and it automatically converts json to pojo object and object to json vice versa . refer this link. you can get good idea about this
http://wiki.fasterxml.com/JacksonSampleSimplePojoMapper
http://www.mkyong.com/java/how-to-convert-java-object-to-from-json-jackson/