在我的SMTP服务器代码中，我有一个MimeMessage实例，我想用它来提取收到的邮件正文（邮件文本）和邮件附件。要做到这一点，我在客户端和服务器端使用了下面的实现。然而，我只能检索邮件附件。这段代码莫名其妙地检测了两次CustomerEngineer.ahmet的东西，但都没有包含邮件正文，这就是......。"This is a message body". 但我可以检索到图像。
在我的java邮件客户端中，我创建了一个具有以下模式的邮件。
try {
// Create a default MimeMessage object
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
// Set Subject
message.setSubject("Hi JAXenter");
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText("This is a message body");
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messageBodyPart);
DataSource source = new FileDataSource(new File(System.getProperty("user.dir").concat("\\src\\main\\java\\emailrelayserver\\CustomerEngineer.png")));
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName("CustomerEngineer.ahmet");
multipart.addBodyPart(messageBodyPart);
message.setContent(multipart);
// Send message
Transport.send(message);
System.out.println("Sent message successfully....");
} catch (MessagingException e) {
throw new RuntimeException(e);
}
在我的服务器端，我使用了以下逻辑。
MimeMessage message = new MimeMessage(session, data);
public void seperateBodyAndAttachments(MimeMessage message) throws MessagingException, IOException {
String mimeType = message.getContentType();
Date dt = new Date();
if (message.isMimeType("text/*")) {
System.out.println("this containst a text file");
} else if (message.isMimeType("multipart/*")) {
Multipart mp = (Multipart) message.getContent();
int idx = 0;
int count = mp.getCount();
for (int i = 0; i < count; i++) {
BodyPart part = mp.getBodyPart(i);
String name = part.getDataHandler().getName();
if (part.isMimeType("text/*")) {
if (name == null) {
name = "text-" + (++idx) + ".txt";
}
System.out.println(name);
} else {
if (name == null) {
name = "attachment-" + (++idx);
}
FileOutputStream fos = new FileOutputStream(System.getProperty("user.dir").concat("\\src\\main\\resources\\DevEnvironmentConfigFile\\" + name));
BufferedOutputStream bos = new BufferedOutputStream(fos);
part.getDataHandler().writeTo(bos);
bos.close();
}
}
} else if (message.isMimeType("message/rfc822")) {
// Not implemented
} else {
Object o = message.getContent();
if (o instanceof String) {
FileWriter fw = new FileWriter(System.getProperty("user.dir").concat("\\src\\main\\java\\emailrelayserver\\downloads\\" + "text.txt"));
BufferedWriter bw = new BufferedWriter(fw);
bw.write((String)o);
bw.close();
} else if (o instanceof InputStream) {
FileOutputStream fos = new FileOutputStream(System.getProperty("user.dir").concat("\\src\\main\\java\\emailrelayserver\\downloads\\" +"message.dat"));
BufferedOutputStream bos = new BufferedOutputStream(fos);
message.getDataHandler().writeTo(bos);
bos.close();
} else {
FileWriter fw = new FileWriter(System.getProperty("user.dir").concat("\\src\\main\\java\\emailrelayserver\\downloads\\" +"unknown.txt"));
BufferedWriter bw = new BufferedWriter(fw);
bw.write((String)o);
bw.close();
}
}
}
不太清楚你的邮件结构。但要注意多部分可以嵌套--所以你要一路向下搜索正文。而对于mutlipartalternative，可能有多个主体。
在你的案例中，你可能会看到
multipart/mixed
multipart/alternative
text/plain
text/html
attachment
样的结构。所以第一个multipart确实不包括body.考虑这个代码。
public void seperateBodyAndAttachments(MimeMessage mm) throws MessagingException, IOException {
String mimeType = message.getContentType();
System.out.println("Message is a " + mimeType);
Object content = mm.getContent();
if(content instanceof String) {
System.out.println("Body: " + content);
} else if(content instanceof MimeMultipart) {
MimeMultipart multi = (MimeMultipart)content;
System.out.println("We have a "+ multi.getContentType());
for(int i = 0; i < multi.getCount(); ++i) {
BodyPart bo = multi.getBodyPart(i);
System.out.println("Content "+i+" is a " + bo.getContentType());
//Now that body part could again be a MimeMultipart...
Object bodyContent = bo.getContent();
//possibly build a recurion here -> the logic is the same as for mm.getContent() above
}
} else {
System.out.println("Some other content: " + content.getClass().getName());
}
}
在你的例子中，混乱来自于两次添加body -part:
// This is the object created
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText("This is a message body");
Multipart multipart = new MimeMultipart();
// you add a reference to this object into the multipart
multipart.addBodyPart(messageBodyPart);
DataSource source = new FileDataSource(new File(System.getProperty("user.dir").concat("\\src\\main\\java\\emailrelayserver\\CustomerEngineer.png")));
//you CHANGE THE CONTENTS of the object to now contain your attachment
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName("CustomerEngineer.ahmet");
//and add it a second time.
multipart.addBodyPart(messageBodyPart);
也许可以试试这样发送:
// Set Subject
message.setSubject("Hi JAXenter");
Multipart multipart = new MimeMultipart("mixed");
//Add Text Part
BodyPart textBodyPart = new MimeBodyPart();
textBodyPart.setContent("This is a message body", "text/plain");
multipart.addBodyPart(textBodyPart);
//Add attachment
DataSource source = new FileDataSource(new File(System.getProperty("user.dir").concat("\\src\\main\\java\\emailrelayserver\\CustomerEngineer.png")));
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName("CustomerEngineer.ahmet");
multipart.addBodyPart(messageBodyPart);
//Set this as message content
message.setContent(multipart);
//This will show you internal structure of your message! D
message.saveChanges();
message.writeTo(System.out);
Transport.send(message);