如何使用服务帐户验证com.google.cloud.bigquery.BigQuery`

Question

I want to use this library

com.google.cloud.bigquery.BigQuery

as in the example:

https://cloud.google.com/bigquery/create-simple-app-api

However I want to authenticate the BigQuery client with service account.

How can I do this?

I see only a default credentials way.

  BigQuery bigquery =
                new BigQueryOptions.DefaultBigqueryFactory().create(BigQueryOptions.defaultInstance());

Answer 1

Try using setCredentials and ServiceAccountCredentials.fromStream while building the service.

BigQuery bigquery = BigQueryOptions.newBuilder()
    .setCredentials(
       ServiceAccountCredentials.fromStream(
         new FileInputStream("your_json_service_keyfile.json"))
    )
    .build().getService()

This ought to be better documented in Google's API doc.

Hope it helps, it's my first answer on stackoverflow :-)

Answer 2

Beware that as per Issue #3535 , the project ID may not be set correctly by setCredentials alone ("Missing project ID" error) and thus should be set explicitly using setProjectId .

Eg

   ServiceAccountCredentials credentials;
   File credentialsPath = new File("/pathToJSONfile/SOME_NAME.json");

   try (FileInputStream serviceAccountStream = new FileInputStream(credentialsPath)) {
      credentials = ServiceAccountCredentials.fromStream(serviceAccountStream);
   }

   BigQuery bigquery = BigQueryOptions.newBuilder()
         .setCredentials(credentials)
         .setProjectId(credentials.getProjectId())
         .build().getService();