使用刷新令牌访问Google Drive API，无浏览器，401错误

Question

我试图使用刷新令牌访问GoogleDrive API（我自己的A/C）--从OAuth Playground发布--如下所示。我正在使用我的刷新令牌和访问令牌进行脱机访问，但我得到了一个未经授权的401。我的代码是基于参考Belwo，以及google-api javadocs构建离线请求的建议

ref: http://stackoverflow.com/questions/10533203/fetching-access-token-from-refresh-token-using-java

public static void main(String[] args) throws IOException {
        HttpTransport TRANSPORT = new NetHttpTransport();
        JsonFactory JSON_FACTORY = new JacksonFactory();

        String refreshTokenString="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"; //from console

        String accessTokenString ="yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy"; //from console

        GoogleCredential credential = createCredentialWithRefreshToken(
            TRANSPORT, JSON_FACTORY, new TokenResponse().setRefreshToken(refreshTokenString));
    credential.setAccessToken("accessTokenString");


    //exeucute HTTP request for offline accessTokenString

    // Execute HTTP GET request to revoke current token.
    HttpResponse response = TRANSPORT.createRequestFactory()
            .buildGetRequest(new GenericUrl(
                    String.format(
                            "https://www.googleapis.com/drive/v2/changes",
                            credential.getAccessToken()))).execute();

    System.out.println("RESPONSE: " +response);

}

 public static GoogleCredential createCredentialWithRefreshToken(HttpTransport transport,
                                                                    JsonFactory jsonFactory, TokenResponse tokenResponse) {

    HttpTransport TRANSPORT = new NetHttpTransport();
    JsonFactory JSON_FACTORY = new JacksonFactory();
    return new GoogleCredential.Builder().setTransport(transport)
            .setJsonFactory(JSON_FACTORY)
            .setClientSecrets(CLIENT_ID, CLIENT_SECRET)
            .build()
            .setFromTokenResponse(tokenResponse);
}

    {
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "required",
    "message": "Login Required",
    "locationType": "header",
    "location": "Authorization"
   }
  ],
  "code": 401,
  "message": "Login Required"
 }
}

Answer 1

我只能使用刷新令牌访问，因为它没有过期？

否。必须将刷新令牌转换为访问令牌。