Concat two json objects in java

Question

I want to concat multiple json object.

I have two json like this

{"message":"test","status":"0"}

and this

{"message":"test-2","status":"1"}

result must be

[{"message":"test","status":"0"},{"message":"test-2","status":"1"}]

How can I do this in Java ?

You want to concat the values from JSON objects, or you want to create array of them ? You can refer to another link on SO: stackoverflow.com/questions/2403132/concat-multiple-jsonobjects — Mandar Pandit
– Mandar Pandit, Commented Aug 7, 2014 at 10:56
I can't use concat with json object.I want to create array of them — Tolgay Toklar
– Tolgay Toklar, Commented Aug 7, 2014 at 10:57
Do you want to handle them as Strings or as JSONObjects in a JSONArray? — user1907906
– user1907906, Commented Aug 7, 2014 at 10:58

Thusitha Thilina Dayaratne · Accepted Answer · 2014-08-07 11:27:31Z

5

You can easily use JSONObject.toString() and concatenate the strings easily e.g

String x = "[" + obj1.toString() "," + obj2.toString() + "]";

or

StringBuilder newStr = new StringBuilder() ;
newStr.append("[").append(obj1.toString()).append(",").append(obj2.toString());

answered Aug 7, 2014 at 11:27

Thusitha Thilina Dayaratne

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1 Comment

Jiwa Chhetri Over a year ago

missed a + between obj1.toString() and ","

shlomi33 · Accepted Answer · 2014-08-07 11:23:37Z

3

Do something like this:

List<String> array = new ArrayList<String>();
array.add("{\"message\":\"test\",\"status\":\"0\"}");
array.add("{\"message\":\"test-2\",\"status\":\"1\"}");
array.toString();

If you want to user support for JSON object in Java, consider using Gson:

import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

public class Main {

    public static void main(String[] args) {
        JsonObject json1 = (JsonObject) new JsonParser().parse("{\"message\":\"test\",\"status\":\"0\"}");
        JsonObject json2 = (JsonObject) new JsonParser().parse("{\"message\":\"test-2\",\"status\":\"1\"}");
        JsonArray array = new JsonArray();
        array.add(json1);
        array.add(json2);
        System.out.println(array.toString());
    }
}

This would give you what you want this time using objects.

edited Aug 7, 2014 at 11:23

answered Aug 7, 2014 at 10:57

shlomi33

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8 Comments

Tolgay Toklar Over a year ago

'<>' operator is not allowed for source level below 1.7 for line 1

shlomi33 Over a year ago

And generics is not allowed before 1.5! So what?!

shlomi33 Over a year ago

Just do: new ArrayList<String>()

Tolgay Toklar Over a year ago

It's fixed but I have one more problem,I have to use this add method with jsonobject.But add method is only accepting string value.What can I do ?

shlomi33 Over a year ago

@TolgayToklar What JSONObject are you using?

|

ArK · Accepted Answer · 2016-08-31 05:24:31Z

private static void concatJSON() throws IOException, InterruptedException {

JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader(new File(Main.class.getResource("/file/user.json").toURI())));

JSONObject jsonObj = (JSONObject) obj; //usernameJsonObj

String [] values = {"0.9" , Date.from(Calendar.getInstance().toInstant()).toLocaleString()},
        innermost = {"Accomplished", "LatestDate"}, 
        inner = {"Lesson1", "Lesson2", "Lesson3", "Lesson4"};
String in = "Jayvee Villa";

JSONObject jo1 = new JSONObject();
for (int i = 0; i < innermost.length; i++)
    jo1.put(innermost[i], values[i]);

JSONObject jo2 = new JSONObject();
for (int i = 0; i < inner.length; i++)
    jo2.put(inner[i], jo1);

JSONObject jo3 = new JSONObject();
jo3.put(in, jo2);

String merger = jsonObj.toString().substring(0, jsonObj.toString().length()-1) + "," +jo3.toString().substring(1);

System.out.println(merger);
FileWriter pr = new FileWriter(file);
pr.write(merger);
pr.flush();
pr.close();
}

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