Apache FOP - PDF가 Commons 전자 메일 첨부 파일로 스트리밍 됨

Question

XSL-FO와 함께 Apache Fop을 사용하여 PDF를 생성하고 있습니다. 그런 다음 apache.commons.mail.HtmlEmail의 첨부 파일로 pdf를 스트리밍하려고합니다. 첨부 파일이있는 이메일을 받았지만 다음 오류가 발생합니다. 길이 0 바이트, 인코딩 없음 파일 시스템에서 pdf 파일을 아무 문제없이 만들 수 있으므로이 코드의 FOP 부분에는 아무런 문제가 없다는 것을 알고 있으므로 왜 작동하지 않는지 잘 모르겠습니다. 누군가 내가 놓친 걸 말해 줄 수 있니?

내 코드.

private void sendBroadcastNofications(PurchaseRequest pr) { 
    try { 
     ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); 
     //Fop sevice used to generate pdf. 
     this.xmlPDFGeneratorService.generatePDF(pr, outputStream); 
     byte[] bytes = outputStream.toByteArray(); 

     //I'm not sure if "application/pdf" would be an issue since fop is giving 
     //it the MimeConstants.MIME_PDF 
     DataSource source = new ByteArrayDataSource(bytes, "application/pdf");    
     EmailAttachment attachment = new EmailAttachment(source, "purchase_requisition.pdf", "Broadcast Purcahse Requisition"); 

     Util.email("Purchase Request " + pr.getPrNumber(), getGenerateMessage(pr), pr.getAuthorizer().getEmail(), attachment); 

    } catch (IOException ex) { 
     Logger.getLogger(EmailServiceImpl.class.getName()).log(Level.SEVERE, null, ex); 
    } 
} 


public static void email(String subject, String message, String recipient, EmailAttachment attachment) { 
    email(subject, message, Collections.singleton(recipient), Collections.singleton(attachment)); 
} 

public static void email(String subject, String message, Set<String> recipients, Set<EmailAttachment> attachments) { 
    try { 
     HtmlEmail email = new HtmlEmail(); 

     email.setHostName("mailhost"); 
     email.setSubject(subject); 
     email.setHtmlMsg(message); 
     email.setFrom("company@domain.com"); 

     for (EmailAttachment attachment : attachments) { 
      try { 
       email.attach(attachment.getDataSource(), attachment.getName(), attachment.getDescription()); 
      } catch (EmailException ex) { 
       System.err.println("Email Attachment Exception: " + ex.getMessage()); 
      } 
     } 

     for (String recipient : recipients) { 
      email.addTo(recipient); 
     } 
     email.send(); 
    } catch (EmailException ex) { 
     System.err.println("Email Failed to Send: " + ex.getMessage()); 
    } 
} 

는 FOP 클래스

public class XMLPDFGeneratorServiceImpl implements XMLPDFGeneratorService { 

private static final File baseDir = new File("."); 
private static final File xsltfile = new File(baseDir, "./PurchaseRequestPDF.xsl"); 

// configure fopFactory as desired 
private final FopFactory fopFactory = FopFactory.newInstance(); 

public void generatePDF(PurchaseRequest pr, ByteArrayOutputStream outStream) { 

    // configure foUserAgent as desired 
    FOUserAgent foUserAgent = fopFactory.newFOUserAgent(); 

    try { 

     // Setup output 
     outStream = new ByteArrayOutputStream(); 

     // Construct fop with desired output format 
     Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, outStream); 

     // Setup XSLT 
     TransformerFactory factory = TransformerFactory.newInstance(); 
     Transformer transformer = factory.newTransformer(new StreamSource(xsltfile)); 

     // Set the value of a <param> in the stylesheet 
     transformer.setParameter("versionParam", "2.0"); 

     ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
     generateXML(pr, stream); 

     byte[] out = stream.toByteArray(); 
     stream.close(); 

     ByteArrayInputStream in = new ByteArrayInputStream(out); 
     // Setup input for XSLT transformation 
     Source src = new StreamSource(in); 

     // Resulting SAX events (the generated FO) must be piped through to FOP 
     Result res = new SAXResult(fop.getDefaultHandler()); 

     // Start XSLT transformation and FOP processing 
     transformer.transform(src, res); 

    } catch (TransformerException ex) { 
     Logger.getLogger(XMLPDFGeneratorServiceImpl.class.getName()).log(Level.SEVERE, null, ex); 
    } catch (IOException ex) { 
     Logger.getLogger(XMLPDFGeneratorServiceImpl.class.getName()).log(Level.SEVERE, null, ex); 
    } catch (FOPException ex) { 
     Logger.getLogger(XMLPDFGeneratorServiceImpl.class.getName()).log(Level.SEVERE, null, ex); 
    } 
} 

public void generateXML(PurchaseRequest pr, ByteArrayOutputStream stream) { 
    try { 
     // create JAXB context and instantiate marshaller 
     JAXBContext context = JAXBContext.newInstance(PurchaseRequest.class); 
     Marshaller m = context.createMarshaller(); 
     m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE); 
     m.setProperty("com.sun.xml.bind.xmlDeclaration", Boolean.FALSE); 
     m.marshal(pr, new PrintWriter(stream)); 
    } catch (JAXBException ex) { 
     Logger.getLogger(XMLPDFGeneratorServiceImpl.class.getName()).log(Level.SEVERE, "JAXB Failed to produce xml stream", ex); 
    } 
} 

} 당신이 generatePDF에서 outStream을 (덮어 쓰는

Answer 1

) 따라서 당신이 통과 한 빈 유지됩니다. 해당 행을 제거하고 다시 시도하십시오.

outStream = new ByteArrayOutputStream();