CODEWITHSUNDEEP
javajson
TAP
TAP

Reputation: 25

Change a value in a json file using jsonparser

I am very new to Java but have figured out how to extract values from a json file - but I can not understand how to change the value.

JsonElement staff = gson.fromJson(new FileReader("file1.json"), JsonElement.class);
String json = gson.toJson(staff);
JsonParser parser = new JsonParser();
JsonElement jsonTree = parser.parse(json);
JsonObject jsonObject = jsonTree.getAsJsonObject();
JsonElement f3obj = ((JsonObject) ((JsonObject) ((JsonArray) jsonObject.get("Options")).get(1)).get("Option").get("Dialog");

How can I update the value of "Dialog" in this object?

Upvotes: 0

Views: 2744

Answers (2)

cody123
cody123

Reputation: 2080

You can update using below mentioned code.

        JsonObject f3obj = ((JsonArray) jsonObject.get("Options")).get(1).getAsJsonObject().get("Option").getAsJsonObject();
        f3obj.addProperty("Dialog", new Integer(10));
        System.out.println(f3obj);

I am using Guava library so below mentioned packages are being used.

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonIOException;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;

Upvotes: 1

Rotem
Rotem

Reputation: 1379

You can create new Json from the given response values.

def jsonData = new JsonSlurper().parseText(response.contentAsString)

And you can use the JSONObject as follows:

JSONObject newStudent  = jsonData.getJSONObject("student");
newStudent.put("name", "John");

If you get an Array as a response use the following code:

JSONObject newStudent  = jsonData.getJSONObject(0).getJSONObject("student");
nweStudent.put("name", "John");

For building JSON using a builder you can use the Json builder:

def builder = new JsonBuilder()
builder([
    [type: 'string', values: ['no', 'name', 'here']]
])

Upvotes: 0

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