Maestro Vladimir :
Hello i have a json file with data exists like this
[
{
"employee": {
"firstName": "Rudi",
"lastName": "Anton"
}
},
{
"employee": {
"firstName": "Syafira",
"lastName": "Zarakaria"
}
}
]
I want to append json data to this file.
My code now not appending data, re-write file.
Help me
This is my code
JSONObject employeeDetails = new JSONObject();
employeeDetails.put("firstName", "Justin");
employeeDetails.put("lastName", "Saklitinov");
JSONObject employeeObject = new JSONObject();
employeeObject.put("employee", employeeDetails);
JSONObject employeeDetails2 = new JSONObject();
employeeDetails2.put("firstName", "Zara");
employeeDetails2.put("lastName", "Lovez");
JSONObject employeeObject2 = new JSONObject();
employeeObject2.put("employee", employeeDetails2);
//Add employees to list
JSONArray employeeList = new JSONArray();
employeeList.add(employeeObject);
employeeList.add(employeeObject2);
//Write JSON file
try{
String strPath = "employee.json";
File strFile = new File(strPath);
boolean fileCreated = strFile.createNewFile();
//File appending
Writer objWriter = new BufferedWriter(new FileWriter(strFile));
//objWriter.write(employeeList.toJSONString());
objWriter.flush();
objWriter.close();
out.flush();
out.print("OK");
} catch (IOException e) {
e.printStackTrace();
}
Smile :
You should read the json file into an JSONArray. Add new employee data to this JSONArray and write it to the file. I have modified some of your code.
// Read json file
String jsonFileStr = new String(
Files.readAllBytes(Paths
.get("PATH TO YOUR EMPLOYEE JSON")),
StandardCharsets.UTF_8);
System.out.println(jsonFileStr);
JSONArray jsonArray = (JSONArray) new JSONParser().parse(jsonFileStr);
// Create employee data to be add to json file
JSONObject employeeDetails = new JSONObject();
employeeDetails.put("firstName", "Justin");
employeeDetails.put("lastName", "Saklitinov");
JSONObject employeeObject = new JSONObject();
employeeObject.put("employee", employeeDetails);
JSONObject employeeDetails2 = new JSONObject();
employeeDetails2.put("firstName", "Zara");
employeeDetails2.put("lastName", "Lovez");
JSONObject employeeObject2 = new JSONObject();
employeeObject2.put("employee", employeeDetails2);
// Add data to jsonArray read from json file
jsonArray.put(employeeObject);
jsonArray.put(employeeObject2);
// Writing the jsonArray back to file
String strPath = "PATH TO EMPLOYEE JSON";
File strFile = new File(strPath);
boolean fileCreated = strFile.createNewFile();
Writer objWriter = new BufferedWriter(new FileWriter(strFile));
objWriter.write(jsonArray.toString());
objWriter.flush();
objWriter.close();
Note: You might want to reconsider using the same key 'employee' multiple times in the json.
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