decode json file in java tutorial

1package com.howtodoinjava.demo.jsonsimple;
2 
3import java.io.FileNotFoundException;
4import java.io.FileReader;
5import java.io.IOException;
6 
7import org.json.simple.JSONArray;
8import org.json.simple.JSONObject;
9import org.json.simple.parser.JSONParser;
10import org.json.simple.parser.ParseException;
11 
12public class ReadJSONExample 
13{
14    @SuppressWarnings("unchecked")
15    public static void main(String[] args) 
16    {
17        //JSON parser object to parse read file
18        JSONParser jsonParser = new JSONParser();
19         
20        try (FileReader reader = new FileReader("employees.json"))
21        {
22            //Read JSON file
23            Object obj = jsonParser.parse(reader);
24 
25            JSONArray employeeList = (JSONArray) obj;
26            System.out.println(employeeList);
27             
28            //Iterate over employee array
29            employeeList.forEach( emp -> parseEmployeeObject( (JSONObject) emp ) );
30 
31        } catch (FileNotFoundException e) {
32            e.printStackTrace();
33        } catch (IOException e) {
34            e.printStackTrace();
35        } catch (ParseException e) {
36            e.printStackTrace();
37        }
38    }
39 
40    private static void parseEmployeeObject(JSONObject employee) 
41    {
42        //Get employee object within list
43        JSONObject employeeObject = (JSONObject) employee.get("employee");
44         
45        //Get employee first name
46        String firstName = (String) employeeObject.get("firstName");    
47        System.out.println(firstName);
48         
49        //Get employee last name
50        String lastName = (String) employeeObject.get("lastName");  
51        System.out.println(lastName);
52         
53        //Get employee website name
54        String website = (String) employeeObject.get("website");    
55        System.out.println(website);
56    }
57}
58

1package com.howtodoinjava.demo.jsonsimple;
2 
3import java.io.FileWriter;
4import java.io.IOException;
5 
6import org.json.simple.JSONArray;
7import org.json.simple.JSONObject;
8 
9public class WriteJSONExample
10{
11    @SuppressWarnings("unchecked")
12    public static void main( String[] args )
13    {
14        //First Employee
15        JSONObject employeeDetails = new JSONObject();
16        employeeDetails.put("firstName", "Lokesh");
17        employeeDetails.put("lastName", "Gupta");
18        employeeDetails.put("website", "howtodoinjava.com");
19         
20        JSONObject employeeObject = new JSONObject(); 
21        employeeObject.put("employee", employeeDetails);
22         
23        //Second Employee
24        JSONObject employeeDetails2 = new JSONObject();
25        employeeDetails2.put("firstName", "Brian");
26        employeeDetails2.put("lastName", "Schultz");
27        employeeDetails2.put("website", "example.com");
28         
29        JSONObject employeeObject2 = new JSONObject(); 
30        employeeObject2.put("employee", employeeDetails2);
31         
32        //Add employees to list
33        JSONArray employeeList = new JSONArray();
34        employeeList.add(employeeObject);
35        employeeList.add(employeeObject2);
36         
37        //Write JSON file
38        try (FileWriter file = new FileWriter("employees.json")) {
39 
40            file.write(employeeList.toJSONString());
41            file.flush();
42 
43        } catch (IOException e) {
44            e.printStackTrace();
45        }
46    }
47}
48