阅读Google电子表格

Question

I am trying to read Google SpreadSheet using java code. For that I have downloaded the client_secret.json file and configured in my java code as below:

public static Credential authorize() throws IOException {
        // Load client secrets.
        GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY,
                new InputStreamReader(SpreadSheetReader.class.getResourceAsStream("/client_secret.json")));

                // Build flow and trigger user authorization request.
        GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(HTTP_TRANSPORT, JSON_FACTORY,
                clientSecrets, SCOPES).setDataStoreFactory(DATA_STORE_FACTORY).setAccessType("offline").build();
        Credential credential = new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver())
                .authorize(service_account);
        System.out.println("Credentials saved to " + DATA_STORE_DIR.getAbsolutePath());
        logger.info("Credentials saved to " + DATA_STORE_DIR.getAbsolutePath());
        return credential;
    }

Above code is working fine. Here I have placed client_secret.json file in src/main/resources/ path.

But now I want to read client_secret.json from some custom path like below:

GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY,
                new InputStreamReader(SpreadSheetReader.class.getResourceAsStream("D:/test/client_secret.json")));  

But when I change to some different path I am facing "NullPointerException" in the above exact line though I give correct absolute path.

If anyone has encountered similar issue could you please help me?

Answer 1

SpreadSheetReader.class.getResourceAsStream("D:/test/client_secret.json") - is most likely what's causing the NPE, since getResourceAsStream is looking for resources in the classpath (inside your JAR, basically).

D:/ is definitely not in the classpath, so I suggest you use a FileInputStream instead:

... new InputStreamReader(new FileInputStream("D:/test/.."));