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);     } 

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