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The goal is to send an email with inline image. Everything is working well, except the image is not appearing in the email.
My approach is based on this Jersey-example of Mailgun's User Guide.
public static ClientResponse SendInlineImage() {
Client client = Client.create();
client.addFilter(new HTTPBasicAuthFilter("api",
"YOUR_API_KEY"));
WebResource webResource =
client.resource("https://api.mailgun.net/v3/YOUR_DOMAIN_NAME" +
"/messages");
FormDataMultiPart form = new FormDataMultiPart();
form.field("from", "Excited User <YOU@YOUR_DOMAIN_NAME>");
form.field("to", "[email protected]");
form.field("subject", "Hello");
form.field("text", "Testing some Mailgun awesomness!");
form.field("html", "<html>Inline image here: <img src=\"cid:test.jpg\"></html>");
File jpgFile = new File("files/test.jpg");
form.bodyPart(new FileDataBodyPart("inline",jpgFile,
MediaType.APPLICATION_OCTET_STREAM_TYPE));
return webResource.type(MediaType.MULTIPART_FORM_DATA_TYPE).
post(ClientResponse.class, form);
}
However, I need to use Spring's RestTemplate.
This is what I've got so far:
RestTemplate template = new RestTemplate();
MultiValueMap<String, Object> map = new LinkedMultiValueMap<>();
// ... put all strings in map (from, to, subject, html)
HttpHeaders headers = new HttpHeaders();
// ... put auth credentials on header, and content type multipart/form-data
template.exchange(MAILGUN_API_BASE_URL + "/messages", HttpMethod.POST,
new HttpEntity<>(map, headers), String.class);
The remaining part is to put the *.png file into the map. Not sure how to do that. Have tried reading all its bytes via ServletContextResource#getInputStream, but without success: Image is not appearing in the resulting e-mail.
Am I missing something here?
955
This turned out to be a case where everything was set up correctly, but only a small detail prevented it from working.
map.add("inline", new ServletContextResource(this.servletContext,
"/resources/images/email-banner.png"));
For Mailgun you need to use the map-key "inline". Also, the ServletContextResource has a method getFilename(), which is used to resolve against the image tag. Thus, the image tag should have the following content id:
<img src="cid:email-banner.png"/>
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