使用Gmail API发送电子邮件时出错？

Question

我正在尝试使用Gmail java API发送邮件.我得到以下错误.

Exception in thread "main" com.google.api.client.googleapis.json.GoogleJsonResponseException: 403 Forbidden
{
  "code" : 403,
  "errors" : [ {
    "domain" : "global",
    "message" : "Insufficient Permission",
    "reason" : "insufficientPermissions"
  } ],
  "message" : "Insufficient Permission"
}
    at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:145)
    at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:111)
    at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:38)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:314)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1060)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:412)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:345)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:463)
    at GMailLibrary.SendEmail.sendMessage(SendEmail.java:32)
    at GMailLibrary.GMailAuthentication.main(GMailAuthentication.java:85)
Java Result: 1

我使用身份验证代码完成了身份验证部分.以下是我发送电子邮件的代码.

public class SendEmail 
{
      public static void sendMessage(Gmail service, String userId, MimeMessage email)throws MessagingException, IOException 
      {
            Message message = createMessageWithEmail(email);
            message = service.users().messages().send(userId, message).execute();

            System.out.println("Message id: " + message.getId());
            System.out.println(message.toPrettyString());
      }

      public static Message createMessageWithEmail(MimeMessage email)throws MessagingException, IOException 
      {
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            email.writeTo(bytes);
            String encodedEmail = Base64.encodeBase64URLSafeString(bytes.toByteArray());
            Message message = new Message();
            message.setRaw(encodedEmail);

            return message;
      }

      public static MimeMessage createEmail(String to, String from, String subject, String bodyText) throws MessagingException 
      {
            Properties props = new Properties();
            Session session = Session.getDefaultInstance(props, null);

            MimeMessage email = new MimeMessage(session);
            //InternetAddress tAddress = new InternetAddress(to);
            //InternetAddress fAddress = new InternetAddress(from);

            email.setFrom(new InternetAddress(from));
            email.addRecipient(javax.mail.Message.RecipientType.TO,new InternetAddress(to));
            email.setSubject(subject);
            email.setText(bodyText);

            return email;
      }

      public static MimeMessage createEmailWithAttachment(String to, String from, String subject,String bodyText, String fileDir, String filename) throws MessagingException, IOException 
      {
            Properties props = new Properties();
            Session session = Session.getDefaultInstance(props, null);

            MimeMessage email = new MimeMessage(session);
            InternetAddress tAddress = new InternetAddress(to);
            InternetAddress fAddress = new InternetAddress(from);

            email.setFrom(fAddress);
            email.addRecipient(javax.mail.Message.RecipientType.TO, tAddress);
            email.setSubject(subject);

            MimeBodyPart mimeBodyPart = new MimeBodyPart();
            mimeBodyPart.setContent(bodyText, "text/plain");
            mimeBodyPart.setHeader("Content-Type", "text/plain; charset=\"UTF-8\"");

            Multipart multipart = new MimeMultipart();
            multipart.addBodyPart(mimeBodyPart);

            mimeBodyPart = new MimeBodyPart();
            DataSource source = new FileDataSource(fileDir + filename);

            mimeBodyPart.setDataHandler(new DataHandler(source));
            mimeBodyPart.setFileName(filename);
            String contentType = Files.probeContentType(FileSystems.getDefault()
                .getPath(fileDir, filename));
            mimeBodyPart.setHeader("Content-Type", contentType + "; name=\"" + filename + "\"");
            mimeBodyPart.setHeader("Content-Transfer-Encoding", "base64");

            multipart.addBodyPart(mimeBodyPart);

            email.setContent(multipart);

            return email;
      }
}

我通过传递所需的信息从主类调用SendMail方法.

MimeMessage email = SendEmail.createEmail(to, from, subject, bodytext); 
SendEmail.sendMessage(service, USER, email);

请帮我.我已经尽力了.如果需要更多信息,请与我们联系.

Answer 1

我在列出messagesd时遇到了同样的问题.我试图删除〜/ .credentials/gmail-api-quickstar中的"StoredCredential",但这无济于事.您需要的是将"GmailScopes"设置为MAIL_GOOGLE_COM,该MAIL_GOOGLE_COM对应于完全权限访问权限.

 /** Global instance of the scopes required by this quickstart. */
private static final List<String> SCOPES =
        Arrays.asList(GmailScopes.MAIL_GOOGLE_COM);