我想使用javamail发送带有内嵌图像的电子邮件。
我正在做这样的事情。
MimeMultipart content = new MimeMultipart("related");
BodyPart bodyPart = new MimeBodyPart();
bodyPart.setContent(message, "text/html; charset=ISO-8859-1");
content.addBodyPart(bodyPart);
bodyPart = new MimeBodyPart();
DataSource ds = new ByteArrayDataSource(image, "image/jpeg");
bodyPart.setDataHandler(new DataHandler(ds));
bodyPart.setHeader("Content-Type", "image/jpeg; name=image.jpg");
bodyPart.setHeader("Content-ID", "<image>");
bodyPart.setHeader("Content-Disposition", "inline");
content.addBodyPart(bodyPart);
msg.setContent(content);
我也试过了
bodyPart.setHeader("inline; filename=image.jpg");
和
bodyPart.setDisposition("inline");
但无论如何,图像都作为附件发送,内容处理正在变成“附件”。
如何使用javamail在电子邮件中内联发送图像?
据我所知,它看起来像你创建消息的方式,一切都是正确的!您使用正确的MIME类型和所有内容。
我不确定为什么你使用DataSource和DataHandler,并且在图像上有ContentID,但是你需要为我完成问题才能解决更多问题。特别是,以下行:
bodyPart.setContent(message, "text/html; charset=ISO-8859-1");
什么是message
?它是否包含<img src="cid:image" />
?
您是否尝试使用String cid = ContentIdGenerator.getContentId();
而不是使用image
生成ContentID
这篇博客文章教我如何使用正确的消息类型,附加我的图像并引用HTML正文中的附件:How to Send Email with Embedded Images Using Java
您必须使用MimeMultipart
类创建内容。使用字符串"related"
作为构造函数的参数非常重要,告诉JavaMail您的部件“一起工作”。
MimeMultipart content = new MimeMultipart("related");
您需要生成ContentID,它是一个字符串,用于标识您附加到电子邮件中的图像,并从电子邮件正文中引用它。
String cid = ContentIdGenerator.getContentId();
注意:这个ContentIdGenerator
类是假设的。您可以创建一个或内联创建内容ID。在我的例子中,我使用一个简单的方法:
import java.util.UUID;
// ...
String generateContentId(String prefix) {
return String.format("%s-%s", prefix, UUID.randomUUID());
}
HTML代码是MimeMultipart
内容的一部分。使用MimeBodyPart
类。设置该部分的文本时,不要忘记指定encoding
和"html"
!
MimeBodyPart htmlPart = new MimeBodyPart();
htmlPart.setText(""
+ "<html>"
+ " <body>"
+ " <p>Here is my image:</p>"
+ " <img src=\"cid:" + cid + "\" />"
+ " </body>"
+ "</html>"
,"US-ASCII", "html");
content.addBodyPart(htmlPart);
请注意,作为图像的来源,我们使用cid:
和生成的ContentID。
我们可以创建另一个MimeBodyPart
用于附加图像。
MimeBodyPart imagePart = new MimeBodyPart();
imagePart.attachFile("resources/teapot.jpg");
imagePart.setContentID("<" + cid + ">");
imagePart.setDisposition(MimeBodyPart.INLINE);
content.addBodyPart(imagePart);
请注意,我们在<
和>
之间使用相同的ContentID,并将其设置为图像的ContentID。我们还设置了对INLINE
的处置,以表示此图像要显示在电子邮件中,而不是作为附件。
而已!如果您在正确的会话上创建SMTP邮件并使用该内容,则您的电子邮件将包含嵌入的图像!例如:
SMTPMessage m = new SMTPMessage(session);
m.setContent(content);
m.setSubject("Mail with embedded image");
m.setRecipient(RecipientType.TO, new InternetAddress("[email protected]"));
Transport.send(m)
如果这对您有用,请告诉我! ;)
你为什么不尝试这样的事情?
MimeMessage mail = new MimeMessage(mailSession);
mail.setSubject(subject);
MimeBodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setContent(message, "text/html");
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messageBodyPart);
messageBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource(new File("complete path to image.jpg"));
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(fileAttachment.getName());
messageBodyPart.setDisposition(MimeBodyPart.INLINE);
multipart.addBodyPart(messageBodyPart);
mail.setContent(multipart);
在消息中,有一个
<img src="image.jpg"/>
标签,你应该没问题。
祝好运
这对我有用:
MimeMultipart rootContainer = new MimeMultipart();
rootContainer.setSubType("related");
rootContainer.addBodyPart(alternativeMultiPartWithPlainTextAndHtml); // not in focus here
rootContainer.addBodyPart(createInlineImagePart(base64EncodedImageContentByteArray));
...
message.setContent(rootContainer);
message.setHeader("MIME-Version", "1.0");
message.setHeader("Content-Type", rootContainer.getContentType());
...
BodyPart createInlineImagePart(byte[] base64EncodedImageContentByteArray) throws MessagingException {
InternetHeaders headers = new InternetHeaders();
headers.addHeader("Content-Type", "image/jpeg");
headers.addHeader("Content-Transfer-Encoding", "base64");
MimeBodyPart imagePart = new MimeBodyPart(headers, base64EncodedImageContentByteArray);
imagePart.setDisposition(MimeBodyPart.INLINE);
imagePart.setContentID("<image>");
imagePart.setFileName("image.jpg");
return imagePart;
如果您使用Spring,请使用MimeMessageHelper
发送包含内联内容的电子邮件(References)。
如果您使用的是Spring Boot,请创建JavaMailSender bean或通过向application.properties文件添加相应的属性来配置它。
@Bean
public JavaMailSender getJavaMailSender() {
JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
mailSender.setHost(host);
mailSender.setPort(port);
mailSender.setUsername(username);
mailSender.setPassword(password);
Properties props = mailSender.getJavaMailProperties();
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.auth", authEnable);
props.put("mail.smtp.starttls.enable", starttlsEnable);
//props.put("mail.debug", "true");
mailSender.setJavaMailProperties(props);
return mailSender;
}
创建算法以生成唯一的CONTENT-ID
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Random;
public class ContentIdGenerator {
static int seq = 0;
static String hostname;
public static void getHostname() {
try {
hostname = InetAddress.getLocalHost().getCanonicalHostName();
}
catch (UnknownHostException e) {
// we can't find our hostname? okay, use something no one else is
// likely to use
hostname = new Random(System.currentTimeMillis()).nextInt(100000) + ".localhost";
}
}
/**
* Sequence goes from 0 to 100K, then starts up at 0 again. This is large
* enough,
* and saves
*
* @return
*/
public static synchronized int getSeq() {
return (seq++) % 100000;
}
/**
* One possible way to generate very-likely-unique content IDs.
*
* @return A content id that uses the hostname, the current time, and a
* sequence number
* to avoid collision.
*/
public static String getContentId() {
getHostname();
int c = getSeq();
return c + "." + System.currentTimeMillis() + "@" + hostname;
}
}
使用内联发送电子邮件。
@Autowired
private JavaMailSender javaMailSender;
public void sendEmailWithInlineImage() {
MimeMessage mimeMessage = null;
try {
InternetAddress from = new InternetAddress(from, personal);
mimeMessage = javaMailSender.createMimeMessage();
mimeMessage.setSubject("Test Inline");
MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true);
helper.setFrom(from);
helper.setTo("[email protected]");
String contentId = ContentIdGenerator.getContentId();
String htmlText = "Hello,</br> <p>This is test with email inlines.</p><img src=\"cid:" + contentId + "\" />";
helper.setText(htmlText, true);
ClassPathResource classPathResource = new ClassPathResource("static/images/first.png");
helper.addInline(contentId, classPathResource);
javaMailSender.send(mimeMessage);
}
catch (Exception e) {
LOGGER.error(e.getMessage());
}
}
使用以下代码段:
MimeBodyPart imgBodyPart = new MimeBodyPart();
imgBodyPart.attachFile("Image.png");
imgBodyPart.setContentID('<'+"[email protected]"+'>');
imgBodyPart.setDisposition(MimeBodyPart.INLINE);
imgBodyPart.setHeader("Content-Type", "image/png");
multipart.addBodyPart(imgBodyPart);
您不需要内联和基本编码 - 您可以传统附加并将链接添加到主消息的文本text/html
。
但是请记住在附加到主消息之前(在附加文件之后)将imgBodyPart
的标题的Content-Type
设置为image/jpg
。
以下是完整的代码
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
private BodyPart createInlineImagePart() {
MimeBodyPart imagePart =null;
try
{
ByteArrayOutputStream baos=new ByteArrayOutputStream(10000);
BufferedImage img=ImageIO.read(new File(directory path,"sdf_email_logo.jpg"));
ImageIO.write(img, "jpg", baos);
baos.flush();
String base64String=Base64.encode(baos.toByteArray());
baos.close();
byte[] bytearray = Base64.decode(base64String);
InternetHeaders headers = new InternetHeaders();
headers.addHeader("Content-Type", "image/jpeg");
headers.addHeader("Content-Transfer-Encoding", "base64");
imagePart = new MimeBodyPart(headers, bytearray);
imagePart.setDisposition(MimeBodyPart.INLINE);
imagePart.setContentID("<sdf_email_logo>");
imagePart.setFileName("sdf_email_logo.jpg");
}
catch(Exception exp)
{
logError("17", "Logo Attach Error : "+exp);
}
return imagePart;
}
MimeMultipart mp = new MimeMultipart();
//mp.addBodyPart(createInlineImagePart());
mp.addBodyPart(createInlineImagePart());
String body="<img src=\"cid:sdf_email_logo\"/>"
我在GMail和Thunderbird中显示内嵌图像时遇到了一些问题,进行了一些测试并使用以下(示例)代码解决:
String imagePath = "/path/to/the/image.png";
String fileName = imagePath.substring(path.lastIndexOf('/') + 1);
String htmlText = "<html><body>TEST:<img src=\"cid:img1\"></body></html>";
MimeMultipart multipart = new MimeMultipart("related");
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setContent(htmlText, "text/html; charset=utf-8");
multipart.addBodyPart(messageBodyPart);
messageBodyPart = new MimeBodyPart();
DataSource fds = new FileDataSource(imagePath);
messageBodyPart.setDataHandler(new DataHandler(fds));
messageBodyPart.setHeader("Content-ID", "<img1>");
messageBodyPart.setDisposition(MimeBodyPart.INLINE);
messageBodyPart.setFileName(fileName);
multipart.addBodyPart(messageBodyPart);
message.setContent(multipart);
只是要注意一些事情:
这对我来说是为一些客户和GMail网络客户端制作内联图像显示,我并不是说这将在所有地方永远工作! :)
(抱歉我的英文和我的错别字!)
RFC规范可以在这里找到(https://tools.ietf.org/html/rfc2392)。
首先,电子邮件html内容需要格式化为:“cid:logo.png”,使用内嵌图片时,请参阅:
<td style="width:114px;padding-top: 19px">
<img src="cid:logo.png" />
</td>
其次,MimeBodyPart对象需要将属性“disposition”设置为MimeBodyPart.INLINE,如下所示:
String filename = "logo.png"
BodyPart image = new MimeBodyPart();
image.setDisposition(MimeBodyPart.INLINE);
image.setFileName(filename);
image.setHeader("Content-ID", "<" +filename+">");
请注意,Content-ID属性必须以透明方式添加前缀和后缀“<”和“>”,并且文件名的值应与img标记的src内容相同,不带前缀“cid:”
最后整个代码如下:
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("[email protected]");
InternetAddress[] recipients = { "[email protected]"};
msg.setRecipients(Message.RecipientType.TO, recipients);
msg.setSubject("for test");
msg.setSentDate(new Date());
BodyPart content = new MimeBodyPart();
content.setContent(<html><body> <img src="cid:logo.png" /> </body></html>, "text/html; charset=utf-8");
String fileName = "logo.png";
BodyPart image = new MimeBodyPart();
image.setHeader("Content-ID", "<" +fileName+">");
image.setDisposition(MimeBodyPart.INLINE);
image.setFileName(fileName);
InputStream stream = MailService.class.getResourceAsStream(path);
DataSource fds = new ByteArrayDataSource(IOUtils.toByteArray(stream), "image/png");
image.setDataHandler(new DataHandler(fds));
MimeMultipart multipart = new MimeMultipart("related");
multipart.addBodyPart(content);
multipart.addBodyPart(getImage(image1));
msg.setContent(multipart);
msg.saveChanges();
Transport bus = session.getTransport("smtp");
bus.connect("username", "password");
bus.sendMessage(msg, recipients);
bus.close();
messageBodyPart.setContent(htmlText,“text / html”); multipart.addBodyPart(messageBodyPart);
messageBodyPart = new MimeBodyPart();
DataSource fds = new FileDataSource("resources/Images/bday.jpg");
messageBodyPart.setDataHandler(new DataHandler(fds));
messageBodyPart.setHeader("Content-ID", "<image>");
// add image to the multipart
multipart.addBodyPart(messageBodyPart);
msg.setContent(multipart);
Transport.send(msg);