Send e-mail in Pdf attachment as stream

问题

I want to send a Pdf as an e-mail attachment (I am using the JavaMail API ). I have the Pdf (generated by jasper) as an byte[].

public InputStream exportPdfToInputStream(User user) throws ParseErrorException, MethodInvocationException, ResourceNotFoundException, JRException, IOException{
        JasperPrint jasperPrint = createJasperPrintObject(user);
        byte[] pdfByteArray = JasperExportManager.exportReportToPdf(jasperPrint);
        return new ByteArrayInputStream(pdfByteArray);
    }

Here is the code that I am using to construct the MimeBodyPart that will be the attachment:

    if (arrayInputStream != null && arrayInputStream instanceof ByteArrayInputStream) {
        MimeBodyPart attachment = new MimeBodyPart(arrayInputStream);
        attachment.setHeader("Content-Type", "application/pdf");
        mimeMultipart.addBodyPart(attachment);
    }

This code gives me this error:

javax.mail.MessagingException: IOException while sending message;
  nested exception is:
    java.io.IOException: Error in encoded stream: needed at least 2 valid base64 characters, but only got 1 before padding character (=), the 10 most recent characters were: "\24\163\193\n\185\194\216#\208="

回答1:

The constructor you used is for parsing a mime part from the transport.

Your second example should work out right. You may consider

not to convert to InputStream and back, this will make unnecessary copies
add a disposition ( e.g. bp.setDisposition(Part.ATTACHMENT); )

回答2:

I have found a solution as suggested in this thread. It seems that there is a DataSource class created just for this purpose. Hope this example will help others also.

    if (arrayInputStream != null && arrayInputStream instanceof ByteArrayInputStream) {
        // create the second message part with the attachment from a OutputStrean
        MimeBodyPart attachment= new MimeBodyPart();
        ByteArrayDataSource ds = new ByteArrayDataSource(arrayInputStream, "application/pdf"); 
        attachment.setDataHandler(new DataHandler(ds));
        attachment.setFileName("Report.pdf");
        mimeMultipart.addBodyPart(attachment);
    }

来源：https://stackoverflow.com/questions/4817083/send-e-mail-in-pdf-attachment-as-stream

标签

java

javamail

mime-types