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JSON Articles
Page 14 of 16
How can we encode a JSON object in Java?
A JSONObject is a subclass of java.util.HashMap where no order is provided. We can also use the strict ordering of elements as well with the help of the JSONValue.toJSONString(map) method i.e. by the implementation of java.util.LinkedHashMap.We can encode a JSON object in the below two examples.Example import java.util.*; import org.json.simple.JSONObject; public class JSONEncodingTest { public static void main(String[] args) { Map dataMap = new HashMap(); dataMap.put("Name", "Adithya"); dataMap.put("Age", new Integer(25)); dataMap.put("Salary", new Double(25000.00)); dataMap.put("Employee Id", new Integer(115)); dataMap.put("Company", "TutorialsPoint"); JSONObject ...
Read MoreHow can we convert a map to the JSON object in Java?
The JSON is a lightweight, text-based and language-independent data exchange format. The JSON can represent two structured types like objects and arrays. An object is an unordered collection of key/value pairs and an array is an ordered sequence of values. We can convert a Map to JSON object using the toJSONString() method(static) of org.json.simple.JSONValue. It has two important static methods: writeJSONString() method to encode an object into JSON text and write it out, escape() method to escape the special characters and escape quotes, \, /, \r, , \b, \f, \t.Exampleimport java.util.*; import org.json.simple.JSONValue; public class ConvertMapJSONTest { public static void main(String[] args) { ...
Read MoreHow can we add a JSONArray to JSONObject in Java?
The JSON is a text-based format for exchanging data. It is a lightweight component and language independent. We can also add a JSONArray to JSONObject. We need to add a few items to an ArrayList first and pass this list to the put() method of JSONArray class and finally add this array to JSONObject using the put() method. Exampleimport org.json.*; import java.util.*; public class AddJSONArrayToJSONObjTest { public static void main(String args[]) { List list = new ArrayList(); list.add("Raja"); list.add("Jai"); list.add("Adithya"); JSONArray array = new JSONArray(); for(int i = 0; i < list.size(); ...
Read MoreHow can we write JSON objects to a file in Java?\\n
The JSON is one of the widely used data-interchange formats and is a lightweight and language independent. The json.simple is a lightweight JSON processing library that can be used to write JSON files and it can be used to encode or decode JSON text and fully compliant with JSON specification(RFC4627). In order to read a JSON file, we need to download the json-simple.jar file and set the path to execute it.Exampleimport java.io.*; import java.util.*; import org.json.simple.*; import org.json.simple.parser.*; public class JSONObjectWriterToFileTest { public static void main(String[] args) throws IOException { JSONObject obj = new JSONObject(); obj.put("Name", "Adithya"); ...
Read MoreHow can we convert a JSON string to a JSON object in Java?
The JSON stands for JavaScript Object Notation and it can be used to transfer and storage of data. The JSONObject can parse text from a String to produce a map-like object. The object provides methods for manipulating its contents, and for producing a JSON compliant object serialization. The JSONArray can parse text from a String to produce a vector-like object. The object provides methods for manipulating its contents, and for producing a JSON compliant array serialization.In the below two examples, We can convert a JSON string to a JSON object.Example 1import org.json.JSONObject; import org.json.JSONArray; public class StringToJSONTest { public static void main(String args[]) { ...
Read MoreHow I can create Python class from JSON object?
We can use python-jsonschema-objects which is built on top of jsonschema.The python-jsonschema-objects provide an automatic class-based binding to JSON schemas for use in Python.We have a sample json schema as followsschema = '''{ "title": "Example Schema", "type": "object", "properties": { "firstName": { "type": "string" }, "lastName": { "type": "string" }, "age": { "description": "Age in years", ...
Read MoreHow can I convert a bytes array into JSON format in Python?
You need to decode the bytes object to produce a string. This can be done using the decode function from string class that will accept then encoding you want to decode with. examplemy_str = b"Hello" # b means its a byte string new_str = my_str.decode('utf-8') # Decode using the utf-8 encoding print(new_str)OutputThis will give the outputHelloOnce you have the bytes as a string, you can use the JSON.dumps method to convert the string object to JSON. examplemy_str = b'{"foo": 42}' # b means its a byte string new_str = my_str.decode('utf-8') # Decode using the utf-8 encoding import json d = json.dumps(my_str) ...
Read MoreHow to add/insert additional property to JSON string using Gson in Java?\\n
The com.google.gson.JSonElement class represents an element of Json. We can use the toJsonTree() method of Gson class to serialize an object's representation as a tree of JsonElements. We can add/ insert an additional property to JSON string by using the getAsJsonObject() method of JSonElement. This method returns to get the element as JsonObject.Syntaxpublic JsonObject getAsJsonObject()Exampleimport com.google.gson.*; public class AddPropertyGsonTest { public static void main(String[] args) { Gson gson = new GsonBuilder().setPrettyPrinting().create(); // pretty print JSON Student student = new Student("Adithya"); String jsonStr = gson.toJson(student, Student.class); System.out.println("JSON String: " + jsonStr); ...
Read MoreHow to convert an array to JSON Array using JSON-lib API in Java?\\n
A Java array is an object which stores multiple variables of the same type, it can hold primitive types and object references whereas JSONArray is an ordered sequence of values. Its external text form is a string wrapped in square brackets with commas separating the values, an internal form is an object having get() and opt() methods for accessing the values by index and element() method for adding or replacing values. In the first step, we can create an Object[] array and pass this parameter as an argument to the toJSON() of JSONSerializer class and typecasting it to get the JSON array.We can convert Object[] array to JSONArray in the below exampleExampleimport ...
Read MoreHow can we sort a JSONObject in Java?\\n
A JSONObject is an unordered collection of a key, value pairs, and the values can be any of these types like Boolean, JSONArray, JSONObject, Number and String. The constructor of a JSONObject can be used to convert an external form JSON text into an internal form whose values can be retrieved with the get() and opt() methods or to convert values into a JSON text using the put() and toString() methods.In the below example, we can sort the values of a JSONObject in the descending order.Exampleimport org.json.*; import java.util.*; public class JSonObjectSortingTest { public static void main(String[] args) { ...
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