gistfile1.txt

import okhttp3.*;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.io.IOException;

public class OAuth2TokenGenerator {

    private static final String TOKEN_URL = "https://your-auth-server.com/oauth/token";
    private static final String CLIENT_ID = "your-client-id";
    private static final String CLIENT_SECRET = "your-client-secret";
    private static final String GRANT_TYPE = "client_credentials"; // or other grant types
    private static final String SCOPE = "your-scope";

    public static void main(String[] args) throws IOException {
        OkHttpClient client = new OkHttpClient();

        RequestBody formBody = new FormBody.Builder()
            .add("client_id", CLIENT_ID)
            .add("client_secret", CLIENT_SECRET)
            .add("grant_type", GRANT_TYPE)
            .add("scope", SCOPE)
            .build();

        Request request = new Request.Builder()
            .url(TOKEN_URL)
            .post(formBody)
            .build();

        try (Response response = client.newCall(request).execute()) {
            if (!response.isSuccessful()) {
                throw new IOException("Unexpected code " + response);
            }

            String responseBody = response.body().string();
            JsonObject json = JsonParser.parseString(responseBody).getAsJsonObject();
            String accessToken = json.get("access_token").getAsString();

            System.out.println("Access Token: " + accessToken);
        }
    }
}