Question

使用sendgrid发送电子邮件，使用以下代码可以正常工作但它没有附件。

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;
    }
  }

}

但我需要的是发送附件，所以我搜索github源和Web文档API，由于某种原因没有javadocs但有一个例子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，起初我是未经授权禁止的，它更好地响应202，意味着有效和排队（check here）这里任何方式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零大小并说不能打开或预览文件！

 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

Answer 1

当我执行代码时，我在netbeans

中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}

解决问题的诀窍是使用包中的commons apache编解码器commons-codec-1.8.jar and its 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);

即使内容长度在响应工作时被重新设为0。

Answer 2

这是您使用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;
    }

Answer 3

它对我有用（the latest maven version SendGrid Java » 4.4.1）：

        import com.sendgrid.helpers.mail.objects.Attachments;
        import com.sendgrid.helpers.mail.objects.Content;
        import com.sendgrid.helpers.mail.objects.Email;
        import com.sendgrid.helpers.mail.Mail;

        ......

        Content content = new Content("text/html", body);
        Mail mail = new Mail(from, subject, to, content);
        Path file = Paths.get(filePath);
        Attachments attachments = new Attachments();
        attachments.setFilename(file.getFileName().toString());
        attachments.setType("application/pdf");
        attachments.setDisposition("attachment");

        byte[] attachmentContentBytes = Files.readAllBytes(file);
        String attachmentContent = Base64.getMimeEncoder().encodeToString(attachmentContentBytes);
        attachments.setContent(attachmentContent);
        mail.addAttachments(attachments);

        SendGrid sg = new SendGrid(apiKey);
        Request request = new Request();

        request.setMethod(Method.POST);
        request.setEndpoint("mail/send");
        request.setBody(mail.build());
        Response response = sg.api(request);

SendGrid通过电子邮件发送API，发送电子邮件附件

3 个答案: