Pls help me to understand why this java program doesn't find array from json file. I didn't find similar type json file via google so pls educate me.
Error:
C:\temp\example.json
org.json.JSONException: JSONObject["result"] not found.
at org.json.JSONObject.get(JSONObject.java:572)
at org.json.JSONObject.getJSONArray(JSONObject.java:765)
at JsonParsingMachine.main(JsonParsingMachine.java:17)
.java content:
import java.io.FileReader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import org.json.*;
public class JsonParsingMachine {
public static void main(String[] args) {
String tiedosto = "C:/temp/example.json";
System.out.println(Paths.get(tiedosto));
try {
String contents = new String((Files.readAllBytes(Paths.get(tiedosto))));
JSONObject o = new JSONObject(contents);
JSONArray res = o.getJSONArray("result");
for (int i = 0; i < res.length(); i++) {
System.out.println();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
json file (example.json)
{
"quoteResponse" : {
"result" : [ {
"language" : "en-US",
"region" : "US",
"quoteType" : "EQUITY",
"quoteSourceName" : "Nasdaq Real Time Price",
"triggerable" : true
} ]
}
}
result array is inside quoteResponse JSONObject. You need to do this instead:
JSONObject o = new JSONObject(contents);
JSONObject quoteResponse = o.getJSONObject("quoteResponse");
JSONArray res = quoteResponse.getJSONArray("result");
Related
I have json file with this format:
{
"1": {
"path": ["C"],
"Des": ["D"]
},
"2": {
"path": ["A"],
"Des": ["D"]
},
"3": {
"path": ["C"],
"Des": ["B"]
}
}
I want to get values in class objects
and using this code to see result before added it to arraylist
objects
import java.io.FileReader;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
public class test2 {
public static void main(String[] args) {
JSONParser parser = new JSONParser();
try {
Object obj = parser.parse(new FileReader("C:/Users/dell/Desktop/streams.json"));
JSONObject jsonObject = (JSONObject) obj;
JSONObject json0 = (JSONObject) jsonObject.get(0);
System.out.println(json0);
} catch (Exception e) {
e.printStackTrace();
}
}
}
The problem is jsonObject is not array, try to do this:
jsonObject.get("1")
Instead of this:
jsonObject.get(0)
To get all keys of the json object simply do:
jsonObject.keySet()
If you want to put keys to the list:
List<String> keys = new ArrayList<>((Set<String>) jsonObject.keySet());
I want to read this JSON file with java using json library
"ListeCar": [
{
"id": "R",
"size": "2",
"Orientation": "Horizontal",
"Position": {
"Row": "2",
"Column": "0"
}
}
This is my java code :
package rushhour;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import org.json.*;
public class JsonClass {
public static void main(String[] args) throws IOException, JSONException {
try{
JSONObject obj = new JSONObject(new FileReader("C:\\Users\\Nuno\\Desktop\\School\\clg-g41326\\RushHourJson.json"));
JSONObject jsonObject = (JSONObject) obj;
JSONArray Liste = obj.getJSONArray("ListeCar");
String listeCar = Liste.getJSONObject(0).getString("id");
for (int i = 0; i <Liste.length(); i++) {
String id = Liste.getJSONObject(i).getString("id");
System.out.println(id);
String size = Liste.getJSONObject(i).getString("size");
System.out.println(size);
String Orientation = Liste.getJSONObject(i).getString("Orientation");
System.out.println(Orientation);
String Position = Liste.getJSONObject(i).getString("Position");
System.out.println(Position);
}
}catch(JSONException e){
e.printStackTrace();
}
}
}
I'm doing this in netbeans and it's kind a my first time using Json !
I want just to do a system.out from this little json code. I don't know why he's not finding the file that i put in the new JSONObjet ...
{
"ListeCar":[
{
"id":"R",
"size":"2",
"Orientation":"Horizontal",
"Position":{
"Row":"2",
"Column":"0"
}
}]
}
try placing this in your .json file
your json is not valid... try placing it in this site to check for it's validity.... http://json.parser.online.fr/
And the code for the correct output....
public static void main(String[] args) throws IOException, JSONException, ParseException {
try {
JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader("/home/Desktop/temp.json"));
JSONObject objJsonObject = new JSONObject(obj.toString());
System.out.println(objJsonObject);
JSONArray Liste = objJsonObject.getJSONArray("ListeCar");
String listeCar = Liste.getJSONObject(0).getString("id");
for (int i = 0; i < Liste.length(); i++) {
String id = Liste.getJSONObject(i).getString("id");
System.out.println(id);
String size = Liste.getJSONObject(i).getString("size");
System.out.println(size);
String Orientation = Liste.getJSONObject(i).getString("Orientation");
System.out.println(Orientation);
String Position = Liste.getJSONObject(i).getJSONObject("Position").toString();
System.out.println(Position);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
You forgot to parse json... which is done in the above code.... a link about the tutorial on how to do this is as follows:: http://crunchify.com/how-to-read-json-object-from-file-in-java/
I have JSONArray in String format as follows :
{
"productsList": [{
"map": {
"productSubcategory": "Levensverzekering",
"nameFirstInsured": "Akkerman"
}
},
{
"map": {
"productSubcategory": "Lineair dalend",
"nameFirstInsured": "Akkerman"
}
}
]
}
I want to convert this String as follows :
{
"productsList": [{
"productSubcategory": "Levensverzekering",
"nameFirstInsured": "Akkerman"
},
{
"productSubcategory": "Lineair dalend",
"nameFirstInsured": "Akkerman"
}
]
}
I have converted JSONArray to String so need operation as on the String on provided String in JSON format.
How I can change the String as required? What should I put in jsonString.replaceAll("","") function?
There is no easy way to do this, you have to do something like this.
OUTPUT IS:
{
"productsList":[
{
"productSubcategory":"Levensverzekering",
"nameFirstInsured":"Akkerman"
},
{
"productSubcategory":"Lineair dalend",
"nameFirstInsured":"Akkerman"
}
]
}
import java.io.FileReader;
import java.io.IOException;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
public class test {
public static void main(String[] args) throws IOException, InterruptedException {
JSONParser parser = new JSONParser();
JSONObject newObj = new JSONObject();
try {
Object obj = parser.parse(new FileReader("test.json"));
JSONObject jsonObject = (JSONObject) obj;
JSONArray arr = (JSONArray) jsonObject.get("productsList");
JSONArray newArr = new JSONArray();
for(int i = 0 ; i < arr.size();i++){
JSONObject object = (JSONObject) arr.get(i);
JSONObject a = (JSONObject) object.get("map");
newArr.add(a);
}
newObj.put("productsList", newArr);
System.out.println(newObj);
} catch (Exception e) {
e.printStackTrace();
}
}
}
I want to read this JSON file with java using json library
"ListeCar": [
{
"id": "R",
"size": "2",
"Orientation": "Horizontal",
"Position": {
"Row": "2",
"Column": "0"
}
}
This is my java code :
package rushhour;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import org.json.*;
public class JsonClass {
public static void main(String[] args) throws IOException, JSONException {
try{
JSONObject obj = new JSONObject(new FileReader("C:\\Users\\Nuno\\Desktop\\School\\clg-g41326\\RushHourJson.json"));
JSONObject jsonObject = (JSONObject) obj;
JSONArray Liste = obj.getJSONArray("ListeCar");
String listeCar = Liste.getJSONObject(0).getString("id");
for (int i = 0; i <Liste.length(); i++) {
String id = Liste.getJSONObject(i).getString("id");
System.out.println(id);
String size = Liste.getJSONObject(i).getString("size");
System.out.println(size);
String Orientation = Liste.getJSONObject(i).getString("Orientation");
System.out.println(Orientation);
String Position = Liste.getJSONObject(i).getString("Position");
System.out.println(Position);
}
}catch(JSONException e){
e.printStackTrace();
}
}
}
I'm doing this in netbeans and it's kind a my first time using Json !
I want just to do a system.out from this little json code. I don't know why he's not finding the file that i put in the new JSONObjet ...
{
"ListeCar":[
{
"id":"R",
"size":"2",
"Orientation":"Horizontal",
"Position":{
"Row":"2",
"Column":"0"
}
}]
}
try placing this in your .json file
your json is not valid... try placing it in this site to check for it's validity.... http://json.parser.online.fr/
And the code for the correct output....
public static void main(String[] args) throws IOException, JSONException, ParseException {
try {
JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader("/home/Desktop/temp.json"));
JSONObject objJsonObject = new JSONObject(obj.toString());
System.out.println(objJsonObject);
JSONArray Liste = objJsonObject.getJSONArray("ListeCar");
String listeCar = Liste.getJSONObject(0).getString("id");
for (int i = 0; i < Liste.length(); i++) {
String id = Liste.getJSONObject(i).getString("id");
System.out.println(id);
String size = Liste.getJSONObject(i).getString("size");
System.out.println(size);
String Orientation = Liste.getJSONObject(i).getString("Orientation");
System.out.println(Orientation);
String Position = Liste.getJSONObject(i).getJSONObject("Position").toString();
System.out.println(Position);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
You forgot to parse json... which is done in the above code.... a link about the tutorial on how to do this is as follows:: http://crunchify.com/how-to-read-json-object-from-file-in-java/
The code below shows:
JavaApplication1.java:34: error: non-static method get(Object) cannot be referenced from a static context
JSONArray cars = (JSONArray) JSONObject.get("cars");
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 JavaApplication1 {
#SuppressWarnings("unchecked")
public static void main(String[] args) {
JSONParser parser = new JSONParser();
try {
JSONArray a = (JSONArray) parser.parse(new FileReader("C:/Users/Glambert/Dropbox/java/New folder/perfection/UPdate/json.txt"));
for (Object o : a)
{
JSONObject person = (JSONObject) o;
String name = (String) person.get("name");
System.out.println(name);
String city = (String) person.get("city");
System.out.println(city);
String job = (String) person.get("job");
System.out.println(job);
JSONArray cars = (JSONArray) JSONObject.get("cars");
for (Object c : cars)
{
System.out.println(c+"");
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}
}
}
Anyone has any idea why this is the case?
(by the way, this code was found online and I edited it to test run, so that I can create a new code to take in a different kind of txt file.)
Project: Code from StackOverflow page How to read json file into java with simple JSON library
Code Author: https://stackoverflow.com/users/1212960/greg-kopff
Check this line
JSONArray cars = (JSONArray) JSONObject.get("cars");
change it with
JSONArray cars = (JSONArray) person.get("cars");
Issue was since you are calling the get method directly on the class.