刷新令牌并重用此令牌以获得新的访问令牌

Question

我如何从第一次授权代码中获得刷新令牌和访问令牌？并且，我如何重用这个刷新令牌来获得一个新的访问令牌，以便使用Java API上传到Google Drive？这不是一个web应用程序。它在Java Swing代码中。

Answer 1

我们可以通过以下代码重用刷新令牌以获得新的访问令牌

public class OAuthRefreshToken implements CredentialRefreshListener  {

    public static GoogleCredential getAccessTokenFromRefreshToken( String refreshToken, HttpTransport transport, com.google.api.client.json.JsonFactory jsonFactory, String CLIENT_ID, String CLIENT_SECRET) throws IOException
    {
        GoogleCredential.Builder credentialBuilder = new GoogleCredential.Builder()
        .setTransport(transport).setJsonFactory(jsonFactory)
        .setClientSecrets(CLIENT_ID, CLIENT_SECRET);
        credentialBuilder.addRefreshListener(new OAuthRefreshToken());

        GoogleCredential credential = credentialBuilder.build();
        credential.setRefreshToken(refreshToken);
        credential.refreshToken();
        return credential;
    }

    @Override
    public void onTokenErrorResponse(Credential arg0, TokenErrorResponse arg1)
            throws IOException {
        // TODO Auto-generated method stub
        System.out.println("Error occured !");
        System.out.println(arg1.getError());
    }

    @Override
    public void onTokenResponse(Credential arg0, TokenResponse arg1)
            throws IOException {
        // TODO Auto-generated method stub
        System.out.println(arg0.getAccessToken());
        System.out.println(arg0.getRefreshToken());
    }

}