SendGrid emailing API , 发送邮件附件

Question

我正在使用 sendgrid 发送电子邮件，使用以下代码可以正常工作，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("[e-mail]");
    String subject = "Hello World from the SendGrid Java Library!";

    Email to = new Email("[e-mail]");
    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;
    }
  }

}

但我需要的是用它发送附件，所以我搜索了 github 源代码和网络文档 API，由于某种原因没有 javadocs 但有一个 GitHub sendgrid 示例所以我一直在尝试直到它起作用，我缩小了一些例外和响应代码，起初我是未经授权的禁止的，它更好地响应 202，意味着有效和排队（ 检查这里）这里是我的代码发送电子邮件和附件但是当你打开附件时它的大小为零并且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("[e-mail]");
            String subject = "Hello World from the SendGrid Java Library!";

            Email to = new Email("[e-mail]");
            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

原文由 shareef 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

当我执行代码时，我在 netbeans 的日志中收到以下消息

 202

 {X-Frame-Options=DENY, Server=nginx, Connection=keep-alive,
 X-Message-Id=vqVw2RtUShSVQ_ymVEVqaw, Content-Length=0, Date=Tue, 26
 Jul 2016 20:05:54 GMT, Content-Type=text/plain; charset=utf-8}

解决这个问题的技巧是使用 commons apache 编解码器 commons-codec-1.8.jar 及其包中的 encodeAsString 方法对附件进行编码

org.apache.commons.codec.binary.Base64

 Attachments attachments3 = new Attachments();
Base64 x = new Base64();
String imageDataString = x.encodeAsString(fileData);
attachments3.setContent(imageDataString);
attachments3.setType("image/png");//"application/pdf"
attachments3.setFilename("x.png");
attachments3.setDisposition("attachment");
attachments3.setContentId("Banner");
mail.addAttachments(attachments3);

甚至内容长度也被重新设置为 0 以响应 它的工作。

原文由 shareef 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 2

这是您可以使用 SendGrid API 发送附件的方式。

 Mail mail = createEmail();
    Attachments attachments = new Attachments();
    Base64 x = new Base64();
    String encodedString = x.encodeAsString(loadPdfFromClasspath());
    attachments.setContent(encodedString);
    attachments.setDisposition("attachment");
    attachments.setFilename("xyx.pdf");
    attachments.setType("application/pdf");
    mail.addAttachments(attachments);

try {
        request.method = com.sendgrid.Method.POST;
        request.endpoint = "mail/send";
        request.body = mail.build();
        // Uncomment once connectivity with sendgrid is resolved
        Response response = sg.api(request);

}catch (IOException ex) {
        throw ex;
    }

原文由 Nayan 发布，翻译遵循 CC BY-SA 3.0 许可协议