通过Gmail API发送带有纯文本后缀的HTML电子邮件 [英] Send HTML email with plain text fallback via Gmail API
问题描述
但是，如果收件人的电子邮件服务器/客户端不支持HTML电子邮件？
例如当使用 Apache commons电子邮件时，我执行以下操作：
//设置html消息
email.setHtmlMsg（< html>我们的徽标 - < img src = \ CID： + CID + \ >< / HTML>中）;
//设置替代消息
email.setTextMsg（您的电子邮件客户端不支持HTML消息）;
有没有办法告诉Gmail API如果收件人电子邮件服务器/客户端有什么邮件回退不支持HTML？
PS
我对Java代码示例感兴趣。
谢谢
要给出两个选项，您可以将 Content-Type 设置为 mixed / alternative 而不是 text / plain 或 text / html ：
如果我们希望在 API资源管理器中尝试这样做，我们只是对邮件进行Base64编码，并将所有 / 替换为 _ 并将所有 + 与 - 。
在开发者控制台中： （
$ example@gmail.com> \r\\\
+
To：< example@gmail.com> \r\\\
+
Content-Type：multipart / alternative; boundary = \foo_bar\\r\\\
\r\\\
+
--foo_bar\r\\ n+
Content-Type：text / plain; charset = UTF-8\r\\\
\r\\\
+
*粗体示例消息文本* \r\\\
\r\\\
+
--foo_bar\r\\\
+
Content-Type：text / html; charset = UTF-8 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ ; / b>< / div> \r\\\
\r\\\
+
--foo_bar--
）.replace（/ \ + / g，' - '）。replace（/ \ // g，'_'）;
POST https://www.googleapis.com/gmail/v1/users/me/messages /发送ACCESS_TOKEN = {} YOUR_API_KEY
{
原始： U3ViamVjdDogRXhhbXBsZSBTdWJqZWN0DQpGcm9tOiA8ZXhhbXBsZUBnbWFpbC5jb20-DQpUbzogPGV4YW1wbGVAZ21haWwuY29tPg0KQ29udGVudC1UeXBlOiBtdWx0aXBhcnQvYWx0ZXJuYXRpdmU7IGJvdW5kYXJ5PSJmb29fYmFyIg0KDQotLWZvb19iYXINCkNvbnRlbnQtVHlwZTogdGV4dC9wbGFpbjsgY2hhcnNldD1VVEYtOA0KDQoqQm9sZCBleGFtcGxlIG1lc3NhZ2UgdGV4dCoNCg0KLS1mb29fYmFyDQpDb250ZW50LVR5cGU6IHRleHQvaHRtbDsgY2hhcnNldD1VVEYtOA0KDQo8ZGl2IGRpcj0ibHRyIj48Yj5Cb2xkIGV4YW1wbGUgbWVzc2FnZSB0ZXh0PC9iPjwvZGl2Pg0KDQotLWZvb19iYXItLQ ==
}？
要在Java中执行等效操作，可以执行以下操作：
消息消息=新的MimeMessage（session）;
Multipart multiPart = new MimeMultipart（alternative）;
MimeBodyPart textPart = new MimeBodyPart（）;
textPart.setText（text，utf-8）;
MimeBodyPart htmlPart = new MimeBodyPart（）;
htmlPart.setContent（html，text / html; charset = utf-8）;
multiPart.addBodyPart（textPart）;
multiPart.addBodyPart（htmlPart）;
message.setContent（multiPart）;
ByteArrayOutputStream output = new ByteArrayOutputStream（）;
message.writeTo（output）;
String rawEmail = Base64.encodeBase64URLSafeString（output.toByteArray（））;
消息消息= new Message（）;
message.setRaw（rawEmail）;
message = service.users（）。messages（）。send（userId，message）.execute（）;
An answered question at StackOverflow suggests that adding html-markup to the body of the email will do the trick. Is that solution correct?
But what if the recipient's email server/client does not support HTML email?
E.g. when using Apache commons email, I do the following:
// set the html message
email.setHtmlMsg("<html>Our logo - <img src=\"cid:"+cid+"\"></html>");
// set the alternative message
email.setTextMsg("Your email client does not support HTML messages");
Is there any way to tell Gmail API what email to fall back to if the recipient email server/client does not support HTML?
P.S. I'm especially interested in Java code samples.
Thanks
To give two alternatives, you can set the Content-Type to mixed/alternative instead of either text/plain or text/html:
If we want to try this out in the API explorer, we just Base64-encode the mail, and make it url-safe by replacing all / with _ and all + with -.
In the Developer Console:
btoa(
"Subject: Example Subject\r\n" +
"From: <example@gmail.com>\r\n" +
"To: <example@gmail.com>\r\n" +
"Content-Type: multipart/alternative; boundary=\"foo_bar\"\r\n\r\n" +
"--foo_bar\r\n" +
"Content-Type: text/plain; charset=UTF-8\r\n\r\n" +
"*Bold example message text*\r\n\r\n" +
"--foo_bar\r\n" +
"Content-Type: text/html; charset=UTF-8\r\n\r\n" +
"<div dir=\"ltr\"><b>Bold example message text</b></div>\r\n\r\n" +
"--foo_bar--"
).replace(/\+/g, '-').replace(/\//g, '_');
POST https://www.googleapis.com/gmail/v1/users/me/messages/send?access_token={YOUR_API_KEY}
{
"raw": "U3ViamVjdDogRXhhbXBsZSBTdWJqZWN0DQpGcm9tOiA8ZXhhbXBsZUBnbWFpbC5jb20-DQpUbzogPGV4YW1wbGVAZ21haWwuY29tPg0KQ29udGVudC1UeXBlOiBtdWx0aXBhcnQvYWx0ZXJuYXRpdmU7IGJvdW5kYXJ5PSJmb29fYmFyIg0KDQotLWZvb19iYXINCkNvbnRlbnQtVHlwZTogdGV4dC9wbGFpbjsgY2hhcnNldD1VVEYtOA0KDQoqQm9sZCBleGFtcGxlIG1lc3NhZ2UgdGV4dCoNCg0KLS1mb29fYmFyDQpDb250ZW50LVR5cGU6IHRleHQvaHRtbDsgY2hhcnNldD1VVEYtOA0KDQo8ZGl2IGRpcj0ibHRyIj48Yj5Cb2xkIGV4YW1wbGUgbWVzc2FnZSB0ZXh0PC9iPjwvZGl2Pg0KDQotLWZvb19iYXItLQ=="
}
To do the equivalent in Java, you could do:
Message message = new MimeMessage(session);
Multipart multiPart = new MimeMultipart("alternative");
MimeBodyPart textPart = new MimeBodyPart();
textPart.setText(text, "utf-8");
MimeBodyPart htmlPart = new MimeBodyPart();
htmlPart.setContent(html, "text/html; charset=utf-8");
multiPart.addBodyPart(textPart);
multiPart.addBodyPart(htmlPart);
message.setContent(multiPart);
ByteArrayOutputStream output = new ByteArrayOutputStream();
message.writeTo(output);
String rawEmail = Base64.encodeBase64URLSafeString(output.toByteArray());
Message message = new Message();
message.setRaw(rawEmail);
message = service.users().messages().send(userId, message).execute();
这篇关于通过Gmail API发送带有纯文本后缀的HTML电子邮件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
