I understand that you want to set up an authentication flow for the Sheets API in Java. In that case I advise you to get familiar with the service builder. As the docs says, it needs abstract objects (an HTTP transport, a JSON factory and an HTTP requests) to initialise correctly.
However there is a simpler approach that you can use to set up the authentication flow easily. Here you have a working example ready to be used. It has all the dependencies imported and all the flow already scripted. You can use that example as a base just by copying and pasting it in your project. Please keep in mind that you may need to install some libraries or set up credentials, so please read the rest of that page for more instructions.
UPDATE
After studying your new comments I believe that these are your goals:
- Set up an OAuth 2.0 credentials flow on the Sheets API.
- To create a new Sheet file.
- Using a Java environment.
If those target are accurate, then you can use the following script:
import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.sheets.v4.Sheets;
import com.google.api.services.sheets.v4.SheetsScopes;
import com.google.api.services.sheets.v4.model.ValueRange;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.GeneralSecurityException;
import java.util.Collections;
import java.util.List;
public class SheetsAPI {
private static final String APPLICATION_NAME = "Sheets API";
private static final JsonFactory JSON_FACTORY = GsonFactory.getDefaultInstance();
private static final String TOKENS_DIRECTORY_PATH = "tokens";
private static final List < String > SCOPES = Collections.singletonList(SheetsScopes.SPREADSHEETS_READONLY);
private static final String CREDENTIALS_FILE_PATH = "/credentials.json";
private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
InputStream in = SheetsQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
if ( in == null) {
throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
}
GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader( in ));
GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES).setDataStoreFactory(new FileDataStoreFactory(new java.io.File(TOKENS_DIRECTORY_PATH))).setAccessType("offline").build();
LocalServerReceiver receiver = new LocalServerReceiver.Builder().setPort(8888).build();
return new AuthorizationCodeInstalledApp(flow, receiver).authorize("user");
}
public static void main(String...args) throws IOException, GeneralSecurityException {
final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
Sheets service = new Sheets.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials(HTTP_TRANSPORT))
.setApplicationName(APPLICATION_NAME)
.build();
Spreadsheet sheet = new Spreadsheet().setProperties(new SpreadsheetProperties().setTitle("My new Sheet"));
sheet = service.spreadsheets().create(sheet).setFields("spreadsheetId").execute();
System.out.println("Sheet ID: " + sheet.getSpreadsheetId());
}
}
That script is based on the Sheets API Java quickstart as discussed in my original answer. I have just modified the original code to interact with the Sheet.Spreadsheets class in order to create a new Sheet (and with the class SpreadsheetProperties too to give it a filename).
Please be aware that I am assuming two things. First, you already have a Java project structure to store the script above. Secondly, you already know your OAuth 2.0 credentials. Those credentials should be stored on a file called credentials.json inside your resources folder (ideally on src/main/resources/) with the format shown below. As an alternative, you could download a ready-for-use credentials.json file from the Cloud Platform.
{
"installed": {
"client_id": "012345678901-abcdefghijklmnopqrstuvwxyzabcdef.apps.googleusercontent.com",
"project_id": "abcdef-012345",
"auth_uri": "https://accounts.google.com/o/oauth2/auth",
"token_uri": "https://oauth2.googleapis.com/token",
"auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
"client_secret": "abcdefghijklmnopqrstuvwx",
"redirect_uris": [
"urn:ietf:wg:oauth:2.0:oob",
"http://localhost"
]
}
}
Please test this approach and let me know if it works for your scenario. Don't hesitate to drop a comment if you need further guidance.
