发送网格电子邮件 API ， 发送电子邮件附件

我使用sendgrid发送电子邮件，使用以下代码工作正常，但没有附件。

package sendgrid;

import com.sendgrid.Content;
import com.sendgrid.Email;
import com.sendgrid.Mail;
import com.sendgrid.Method;
import com.sendgrid.Request;
import com.sendgrid.Response;
import com.sendgrid.SendGrid;
import java.io.IOException;

public class SendEmail {
    public static void main(String[] args) throws IOException {
    Email from = new Email("test@example.com");
    String subject = "Hello World from the SendGrid Java Library!";

    Email to = new Email("shareef@gmail.com");
    Content content = new Content("text/plain", "Hello, Email!");
    Mail mail = new Mail(from, subject, to, content);

    SendGrid sg = new SendGrid("SG.rIEh84OgQBybYEJcOMie1wd.AZqqdWNYXbOqTarUJcG-iSg0UtHJtCto4oe6tVzn6es");
    Request request = new Request();
    try {

      request.method = Method.POST;
      request.endpoint = "mail/send";
      request.body = mail.build();

      Response response = sg.api(request);
      System.out.println(response.statusCode);
      System.out.println(response.body);
      System.out.println(response.headers);

    } catch (IOException ex) {
      throw ex;
    }
  }

}

但是我需要的是用它发送附件，所以我搜索了github源代码和Web文档API，并且由于某种原因没有javadocs，但有一个示例GitHub sendgrid，所以我尝试直到它工作，我缩小了一些异常和响应代码，起初我得到了未经授权的禁止，它得到了更好的响应202， 意味着有效和排队（检查这里）任何方式这里都是我的代码，剂量发送电子邮件和附件，但当你打开附件时，它的零大小，并说无法打开或预览文件！

 package sendgrid;

    import com.sendgrid.Attachments;
    import com.sendgrid.Content;
    import com.sendgrid.Email;
    import com.sendgrid.Mail;
    import com.sendgrid.MailSettings;
    import com.sendgrid.Method;
    import com.sendgrid.Request;
    import com.sendgrid.SendGrid;
    import com.sendgrid.Setting;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;


    public class SendEmailAttachmentV2 {

        public static void main(String[] args) throws IOException {
            sendmail();
        }

        // Fully populated Mail object
        public static void sendmail() throws IOException {

            com.sendgrid.Response response1;

            Email from = new Email("shareef@gmail.com");
            String subject = "Hello World from the SendGrid Java Library!";

            Email to = new Email("shareef@gmail.com");
            Content content = new Content("text/plain", "Hello, Email!");
            Mail mail = new Mail(from, subject, to, content);

            File file = new File("C:\\x.png");
            byte[] fileData = null;
            try {
                fileData = org.apache.commons.io.IOUtils.toByteArray(new FileInputStream(file));
            } catch (IOException ex) {
            }

            Attachments attachments3 = new Attachments();            
            attachments3.setContent(new String(fileData, 0, (int) file.length(), "UTF-8"));
            attachments3.setType("image/png");//"application/pdf"
            attachments3.setFilename("x.png");
            attachments3.setDisposition("attachment");
            attachments3.setContentId("Banner");
            mail.addAttachments(attachments3);


            MailSettings mailSettings = new MailSettings();
            Setting sandBoxMode = new Setting();
            sandBoxMode.setEnable(true);
            mailSettings.setSandboxMode(sandBoxMode);

            SendGrid sg = new SendGrid("SG.1Hg78VK0TJ6kexUnByZUYg.LAa5A4GufssZ9lpPQdV6PcZCY6SZ9Xq6LvqfMRG0wesKw");
            Request request1 = new Request();
            try {
                request1.method = Method.POST;
                request1.endpoint = "mail/send";

                request1.body = mail.build();

                response1 = sg.api(request1);
                System.out.println(response1.statusCode);
                System.out.println(response1.body);
                System.out.println(response1.headers);

            } catch (IOException ex) {
                System.out.println(ex);
            }
        }

    }

仅供参考：使用从 sendgrid 控制台生成的生成的 API 密钥