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.
Related
I've two JSON Objects as below
firstJSON: {"200":"success"}
secondJSON: {"401":"not found"}
I need to combine them as {"codes":{"200":"success"},{"401":"not found"}} using java.
I tried in 3 ways but couldn't achieve the desired output. Could you please help with code snippet?
code which I've tried as below
JSONObject firstJSON = new JSONObject();
firstJSON.put("200", "success");
String firstJSONStr = firstJSON.toString();
System.out.println("firstJSONStr--> " + firstJSONStr);
JSONObject secondJSON = new JSONObject();
secondJSON.put("401", "not found");
String secondJSONStr = secondJSON.toString();
System.out.println("secondJSONStr--> "+secondJSONStr);
String finalJSONStr = firstJSONStr + "," + secondJSONStr;
JSONObject finalJSON1 = new JSONObject();
finalJSON1.put("codes", new JSONObject(finalJSONStr));
System.out.println("finalJSON1--> " + finalJSON1.toString());
JSONObject finalJSON2 = new JSONObject();
finalJSON2.put("codes", finalJSONStr);
System.out.println("finalJSON2--> " + finalJSON2.toString());
JSONObject finalJSON3 = new JSONObject();
ArrayList<JSONObject> jsonArray = new ArrayList<JSONObject>();
jsonArray.add(firstJSON);
jsonArray.add(secondJSON);
finalJSON3.put("codes", jsonArray);
System.out.println("finalJSON3--> " + finalJSON3.toString());
Output:
firstJSONStr--> {"200":"success"}
secondJSONStr--> {"401":"not found"}
finalJSON1--> {"codes":{"200":"success"}}
finalJSON2--> {"codes":"{\"200\":\"success\"},{\"401\":\"not found\"}"}
finalJSON3--> {"codes":[{"200":"success"},{"401":"not found"}]}
Your expected JSON {"codes":{"200":"success"},{"401":"not found"}} is invalid. You can verify it with https://jsonlint.com/ which will produce an error:
Error: Parse error on line 4:
...00": "success" }, { "401": "not foun
---------------------^
Expecting 'STRING', got '{'
You most likely want an array to group the first and second object which results in below JSON (do notice the square brackets [ and ]):
{"codes":[{"200":"success"},{"401":"not found"}]}
This can be achieved with:
JSONObject first = new JSONObject();
first.put("200", "success");
JSONObject second = new JSONObject();
second.put("401", "not found");
JSONArray codes = new JSONArray();
codes.put(first);
codes.put(second);
JSONObject root = new JSONObject();
root.put("codes", codes);
System.out.println(root);
Got the logic finally.
JSONObject successJSON = new JSONObject();
successJSON.put("description", "success");
JSONObject scJSON = new JSONObject();
scJSON.put("200", successJSON);
JSONObject failJSON = new JSONObject();
failJSON.put("description","failure");
scJSON.put("401", failJSON);
JSONObject finalJSON = new JSONObject();
finalJSON.put("codes", scJSON);
System.out.println("finalJSON --> "+finalJSON.toString());
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));
}
}
I have a question that would like to seek your expertise on.
I have Class call Technology and i retrieve data from the DB as object list of Technology classtechnologyList= getProjectBD().getAllTechnology();
my question is how to store data as key value pair in Json array.
This is my code
JSONArray technologyArray=new JSONArray();
for (Technology technology : technologyList) {
JSONArray gridRow=new JSONArray();
gridRow.put(technology.getTechnologyId());
gridRow.put(technology.getTechnologyName());
technologyArray.put(gridRow);
}
I need to pass this data to select option in my jsp as id and name.
ex:-[1:JAVA,2:C#...]
Try to use com.google.gson.* elements like that :
private JsonArray serializetechnologies(List<Technology> technologyList) {
JsonArray jsonArray = new JsonArray();
for (Technology technology : technologyList) {
JsonObject jsonObject = new JsonObject();
jsonObject.addProperty(technology.getTechnologyId()+"", technology.getTechnologyName());
jsonArray.add(jsonObject);
}
return jsonArray;
}
And if you want to get value :
for (JsonElement jsonElement : jsonArray) {
JsonObject jsonObject = (JsonObject) jsonElement;
String name = jsonObject.get(technologyX.getTechnologyId() + "").getAsString();
System.out.println("The name of technology witch Id = " + technologyX.getTechnologyId() + " is : "
+ name);
}
I hope that will help :)
I have a JSON Object that looks like this :
"TripList":{
"noNamespaceSchemaLocation":"http://api.vasttrafik.se/v1/hafasRestTrip.xsd",
"servertime":"11:27",
"serverdate":"2013-04-02",
"Trip":[{
"Leg":{
"name":"Spårvagn 3",
"type":"TRAM",
"id":"9015014500300079",
"direction":"Kålltorp",
"fgColor":"#004b85",
"bgColor":"#ffffff",
"stroke":"Solid",
"accessibility":"wheelChair",
"Origin":{
"name":"Brunnsparken, Göteborg",
"type":"ST",
"id":"9022014001760004",
"routeIdx":"19",
"time":"11:27",
"date":"2013-04-02",
"track":"D ",
"rtTime":"11:31",
"rtDate":"2013-04-02",
"$":"\n"
}
to get the name inside the Leg object is working fine.
But if I wanna get thetime inside the Origin object how do I do that?
My code is like this so far:
JSONParser parser = new JSONParser();
Object obj = parser.parse(Planner.getPlanner().getJsonDataForTrip(Planner.getPlanner().getStartLocationID(), Planner.getPlanner().getDestinationID()));
JSONObject topObject = (JSONObject) obj;
JSONObject locationList = (JSONObject) topObject.get("TripList");
JSONArray array = (JSONArray) locationList.get("Trip");
Iterator<JSONObject> iterator = array.iterator();
while (iterator.hasNext()) {
JSONObject jsonObj = iterator.next();
jsonObj = (JSONObject) jsonObj.get("Leg");
String line = (String) jsonObj.get("name");
Planner.getPlanner().setLines(line);
System.out.println(jsonObj.get("Origin"));
Long time = (Long) jsonObj.get("time");
String track =(String) jsonObj.get("track");
System.out.println(line);
System.out.println(time);
System.out.println(track);
}
}
And in the console it say like this :
{"routeIdx":"19","id":"9022014001760004","rtDate":"20130402","time":"15:02","$":"\n","name:"Brunnsparken, Göteborg","track":"D ","rtTime":"15:06","date":"2013-04-02","type":"ST"}
Spårvagn 3
null
null
So basiclly i am getting the name Spårvang 3 already. But I wanna get the time.
so the time that I am trying to get out by using jsonObj.get("time"); is giving a null value.
Whats the problem and how can I get the time from the object "Origin"??
Since "Time" is part of the "Origin"-object, you would need to extract the "Origin"-object first:
JSONOject origin = (JSONObject) jsonObj.get("Origin");
And then:
String time = origin.getString("time");
You are getting 'time' and 'track' properties of 'Leg' object, not the 'Origin' object..
It should be:
JSONParser parser = new JSONParser();
Object obj = parser.parse(Planner.getPlanner().getJsonDataForTrip(Planner.getPlanner().getStartLocationID(), Planner.getPlanner().getDestinationID()));
JSONObject topObject = (JSONObject) obj;
JSONObject locationList = (JSONObject) topObject.get("TripList");
JSONArray array = (JSONArray) locationList.get("Trip");
Iterator<JSONObject> iterator = array.iterator();
while (iterator.hasNext()) {
JSONObject jsonObj = iterator.next();
jsonObj = (JSONObject) jsonObj.get("Leg");
String line = (String) jsonObj.get("name");
Planner.getPlanner().setLines(line);
System.out.println(jsonObj.get("Origin"));
// Added this line
jsonObj = (JSONObject) jsonObj.get("Origin");
String time = (String) jsonObj.get("time");
String track =(String) jsonObj.get("track");
System.out.println(line);
System.out.println(time);
System.out.println(track);
}
Do following code
JSONOject origin = (JSONObject) jsonObj.get("Origin");
String time = (String) origin.getString("time");
them use SimpleDateFormat to parse time string and get date object
I have the following code:
JsonParser parser = new JsonParser();
System.out.println("gson.toJson: " + gson.toJson(roomList));
JsonObject json2 = parser.parse("{\"b\":\"c\"}").getAsJsonObject();
System.out.println("json2: " + json2);
JsonObject json = parser.parse(gson.toJson(roomList)).getAsJsonObject();
System.out.println("json: " + json);
It gives me the following output:
gson.toJson: [{"id":"8a3d16bb328c9ba201328c9ba5db0000","roomID":9411,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328b9f3a01328b9f3bb80000","roomID":1309,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328ba09101328ba09edd0000","roomID":1304,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bb8af640000","roomID":4383,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd271fe0001","roomID":5000,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd2e0e30002","roomID":2485,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd3087b0003","roomID":6175,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd35a840004","roomID":3750,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd366250005","roomID":370,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd3807d0006","roomID":9477,"numberOfUsers":4,"roomType":"BigTwo"}]
json2: {"b":"c"}
java.lang.IllegalStateException: This is not a JSON Object.
Can someone please help me parse my Json string to JsonObject? I have checked in http://jsonlint.com/ that my json is valid though.
It's because due to the JSON structure..
I have to put it into a JSONObject first, like so
JsonObject jsonObj = new JsonObject();
jsonObj.addProperty(ServerConstants.JSONoutput, gson.toJson(roomList));
Then I would deserialize like
List<RoomData> roomList = gson.fromJson(jsonObj.get(CardGameConstants.JSONoutput).toString(), listType);
for (RoomData roomData : roomList) {
System.out.println(roomData.getRoomID());
}
This should give you some basic idea.
ArrayList<String> roomTypes = new ArrayList<String>();
JSONArray jsonArray = new JSONArray(jsonString);
for(int i =0; i<jsonArray.length(); i++){
roomTypes.add(jsonArray.getJSONObject(i).getString("roomType"));
}
The problem with the code is that roomList is not a JsonObject as evident in the printed output. It's actually a JsonArray.
To fix the code, call .getAsJsonArray() (instead of .getAsJsonObject())
JsonParser parser = new JsonParser();
System.out.println("gson.toJson: " + gson.toJson(roomList));
JsonObject json2 = parser.parse("{\"b\":\"c\"}").getAsJsonObject();
System.out.println("json2: " + json2);
JsonArray json = parser.parse(gson.toJson(roomList)).getAsJsonArray();
System.out.println("json: " + json);