Reading the full email from GMail using JavaMail

问题

I am making use of javamail and I am having trouble getting the HTML from my gmail emails. I have the following:

Session session = Session.getDefaultInstance(props, null);
Store store = session.getStore("imaps");
store.connect("imap.gmail.com", "myemail@gmail.com", "password");
System.out.println(store);

Folder inbox = store.getFolder("Inbox");
inbox.open(Folder.READ_ONLY);
Message messages[] = inbox.getMessages();
for(Message message:messages) {
System.out.println(message); // com.sun.mail.imap.IMAPInputStream@cec0c5

The above all works fine but I can't print or get the actual HTML or Text email. I just get some sort of InputStream, how do I deal with this easily to get the raw HTML of the email?

I also tried looping through the message but that didn't get me very far:

Message message[] = inbox.getMessages();

    for (int i=0, n=message.length; i<n; i++) {
       System.out.println(i + ": " + message[i].getFrom()[0] 
         + "\t" + message[i].getSubject());
       String content = message[i].getContent().toString();
       if (content.length() > 200) 
    content = content.substring(0, 600);
       System.out.print(content);

}

Thanks all for any hlep.

回答1:

The InputStream object contains the body of the email. You need to read the entirety of the stream to read the entire body of the message. For instance, this SO post details how to write an entire InputStream to an OutputStream such as System.out using an Apache library. That would be a good place to start as you could print the entire message body to the console. Otherwise, you'll need to use some buffers, etc, to pull the data out of the stream and put it into whatever you want to put it in. There is also this SO post that details, using the same library, how to convert an InputStream into a String.

回答2:

The issue is that the data you get is typically the raw data for a mime/multipart stream. You need to do something like this:

for(Message message:messages) {
  if(javax.mail.Multipart.class.isInstance(message)){
    Multipart parts = (Multipart)msg.getContent(), innerPart;
    int i;
    for(i=0;i<parts.getCount();i++){
      javax.mail.BodyPart p = parts.getBodyPart(i);
      if("text/html".equals(p.getContentType())){
        // now you can read out the contents from p.getContent()
        // (which is typically an InputStream, but depending on your javamail
        // libraries may be something else
      }
    }
  }
}

Good luck.

回答3:

You could use IOUtils of Apache Commons or can possibly even try something along the lines of :

BufferedReader br = new BufferedReader(new InputStreamReader(daInputStream));
String oneLine = "";
while ( (oneLine = br.readLine()) !=  null )
    System.out.println(oneLine);

回答4:

if you use java mail, you can use "multipart" and "bodypart" objects to go through the email message to extract the "text/plain" and "text/html" content, which are the content you want.

回答5:

your could try with the MimeMessage class:

Session session = Session.getDefaultInstance(props, null);
Store store = session.getStore("imaps");
store.connect("imap.gmail.com", "myemail@gmail.com", "password");

Folder inbox = store.getFolder("Inbox");
inbox.open(Folder.READ_ONLY);
Message messages[] = inbox.getMessages();
for(Message message:messages) {
    MimeMessage im = new MimeMessage(session, message.getContent());
    im.getFrom();
    im.getMessageID();
    ...
}

来源：https://stackoverflow.com/questions/5928608/reading-the-full-email-from-gmail-using-javamail

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java

gmail

javamail