CODEWITHSUNDEEP
javajson
Anubhav Singh
Anubhav Singh

Reputation: 8699

How to add append a new class object to the existing JSON file in Java?

I am trying to append a class object to the existing json file using java but getting following output:

[{"email_id":"[email protected]","password":"Password ","user_name":"Anubhav Singh"}] {"email_id":"[email protected]","password":"madhav1234", "user_name":"Madhav kumar"}

But the expected output should be:

[{"email_id":"[email protected]", "password":"Password ","user_name":"Anubhav Singh"},{"email_id":"[email protected]","password":"madhav1234","user_name":"Madhav kumar"}]

My code:

FileWriter file = new FileWriter("/home/anubhav55182/NetBeansProjects/Tweetoria/src/java/Signup/data.json",Boolean.TRUE);//output json file
            JSONObject obj = new JSONObject();//for json file generation
            obj.put("user_name",name);
            obj.put("user_id",username);
            obj.put("email_id",email);
            obj.put("password",pass);
            file.write(obj.toJSONString());
            file.flush();

Could someone help me to append new object to existing json file using java.

Thanks in advance for your help.

Upvotes: 0

Views: 1756

Answers (1)

MyStackFlowethOver
MyStackFlowethOver

Reputation: 197

You're currently only adding another JSONObject to the file. The functionality you're looking for requires you to read in the existing file (with email_id: [email protected]) as a JSONArray. From there, you can append the array with your new object.

You'll want to read in the file as an array, put the info to be added into a JSONObject (as you have above) and then add that object to the array.

Here are the Oracle docs for JSONArray: http://docs.oracle.com/javaee/7/api/javax/json/JsonArray.html

Upvotes: 2

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