Sending email with attachment through GMailSender?

问题

I have been reading the blogs and have tried numerous implementations but have still failed to get an image attached to an email that I\'m sending through GMail using java. I downloaded all the jars and added GMailSender.java, GMailAuthenticator.java, and JSSEProvider.java and I\'m able to send regular e-mails just fine. The way I\'ve tried doing it is shown below, with the middle part that\'s commented out being the part I had hoped would add the image. Below that is the output on the logcat when I try to execute this. Surely I am missing something pretty simple. Could someone point it out to me please? Thanks in advance.

    public synchronized void sendMail(String subject, String body, String sender, String recipients) throws Exception {  
        try {  
            Thread.currentThread().setContextClassLoader(getClass().getClassLoader());  
        MimeMessage message = new MimeMessage(session);  
        DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), \"text/plain\"));  
        message.setSender(new InternetAddress(sender));  
        message.setSubject(subject);  
        message.setDataHandler(handler);  

        /*  
        // Create your new message part  
        BodyPart imgPart = new MimeBodyPart();  

        // Create a related multi-part to combine the parts  
        MimeMultipart multipart = new MimeMultipart(\"related\");  
        multipart.addBodyPart(imgPart);

        String fileName = \"http://.../sampleBarcode.png\";  

        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();  
        if (classLoader == null) {  
                classLoader = this.getClass().getClassLoader();  
            if (classLoader == null) {  
                System.out.println(\"IT IS NULL AGAIN!!!!\");  
            }  
        }  

        DataSource ds = new URLDataSource(classLoader.getResource(fileName));  
        imgPart.setDataHandler(new DataHandler(ds));  
        imgPart.setHeader(\"Content-ID\", \"<logoimg_cid>\");  

        multipart.addBodyPart(imgPart);  

        message.setContent(multipart);  
        */  

        if(recipients.indexOf(\',\') > 0) {  
                message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));  
        }  
        else message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));  

        Transport.send(message);  
        }  
        catch(Exception e){Log.e(\"EMAIL_ERROR\",e.getMessage(), e);}  
    }   

null  
java.lang.NullPointerException  
    at javax.activation.URLDataSource.getContentType(URLDataSource.java:91)  
    at javax.activation.DataHandler.getContentType(DataHandler.java:218)  
    ...  
    ...  
    (plus some more)  

回答1:

I modified the function to accept a File parameter and attach it to the email, here it is

public synchronized void sendMail(String subject, String body, String sender, String recipients, File attachment) throws Exception {
    try{
    MimeMessage message = new MimeMessage(session);
    message.setSender(new InternetAddress(sender));
    message.setSubject(subject);

    MimeBodyPart mbp1 = new MimeBodyPart();
    mbp1.setText(body);

    MimeBodyPart mbp2 = new MimeBodyPart();
    FileDataSource fds = new FileDataSource(attachment);
    mbp2.setDataHandler(new DataHandler(fds));
    mbp2.setFileName(fds.getName());

    Multipart mp = new MimeMultipart();
    mp.addBodyPart(mbp1);
    mp.addBodyPart(mbp2);

    message.setContent(mp);

    if (recipients.indexOf(',') > 0)
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
    else
        message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
    Transport.send(message);
    }catch(Exception e){

    }
}

来源：https://stackoverflow.com/questions/6005983/sending-email-with-attachment-through-gmailsender