How can we read JSON file - json

Question

Utility to read JSON file from file server
2. Utility should run at scheduled time let’s say 6AM
3. Error message if JSON file is not properly formatted
4. Error message if Category is missing and ITEM need that Category to be saved.
5. Entity mapping as per the given relationship in data model
5. Documentation for the API, preferably using any tool
6. Junit Test cases using Mockito
7. Use either MySQL or Oracle for API development
8. add one point as JSON validation for not null and value range
Thanks

Answer 1

i tried below to cover first question of this problem but not sure what to do to answer remaining 7 questions related with this probelm:-
Create a class named "JSONRead" in eclipse. In this we will using "JSONParser" to convert the JSON string in the file to JSONOBject.
In order to use JSON Parser makes sure that your string is in JSON format.
enter code here`enter code here`
enter code here
{
package logicProgramming;
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 JsonRead {
public static void main(String[] args) {
JSONParser parser = new JSONParser();
//JsonParser to convert JSON string into Json Object
try {
Object obj = parser.parse(new FileReader("g:\\newfile.json"));
//parsing the JSON string inside the file that we created earlier.
JSONObject jsonObject = (JSONObject) obj;
System.out.println(jsonObject);
//Json string has been converted into JSONObject
String name = (String) jsonObject.get("name");
System.out.println(name);
String department = (String) jsonObject.get("department");
System.out.println(department);
String branch = (String) jsonObject.get("branch");
System.out.println(branch);
long year = (long) jsonObject.get("year");
System.out.println(year);
//Displaying values from JSON OBject by using Keys
JSONArray remarks = (JSONArray) jsonObject.get("remarks");
//converting the JSONObject into JSONArray as remark was an array.
Iterator<String> iterator = remarks.iterator();
//Iterator is used to access the each element in the list
//loop will continue as long as there are elements in the array.
while (iterator.hasNext()) {
System.out.println(iterator.next());
//accessing each elemnt by using next function.
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}
}
}
enter code here
enter code here
Thanks