如何在不請求示波器的情況下訪問用戶的電子郵件信息userinfo.profile

目前，我只想根據用戶的憑據瞭解用戶的電子郵件。如何在不請求示波器的情況下訪問用戶的電子郵件信息userinfo.profile

public static Userinfoplus getUserInfo(Credential credentials) 
{ 
    Oauth2 userInfoService = 
     new Oauth2.Builder(httpTransport, JSON_FACTORY, credentials).setApplicationName("JStock").build(); 
    Userinfoplus userInfo = null; 
    try { 
     userInfo = userInfoService.userinfo().get().execute(); 
    } catch (IOException e) { 
     System.err.println("An error occurred: " + e); 
    } 
    if (userInfo != null && userInfo.getId() != null) { 
     return userInfo; 
    } else { 
     return null; 
    } 
} 

System.out.println(getUserInfo(credential).getEmail());

然而，爲了使上面的代碼工作，我需要包括https://www.googleapis.com/auth/userinfo.profile太

Set<String> scopes = new HashSet<String>(); 
scopes.add("https://www.googleapis.com/auth/userinfo.email"); 
scopes.add("https://www.googleapis.com/auth/userinfo.profile"); 
scopes.add(DriveScopes.DRIVE_APPDATA);

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