我有一个程序可以将输入表单转换为pdf文件，还有一个选项可以上传另一个pdf并将这两个pdf附加到单个文档中。我已经更改了启用多个文件上传的代码。 但是当上传多个pdf时，它会导致0kb文件。
附加代码适用于单个pdf上传
这是我的AgreementsBean。
public void handleFileUpload(FileUploadEvent event) {
try {
Class.forName(drivername);
Connection con = DriverManager.getConnection(urlName, databaseUsername, databasePassword);
Statement st = con.createStatement();
String saved_file = "";
String fileName1 = "";
if (null != event.getFile().getFileName() && event.getFile().getSize() != 0) {
fileName1 = event.getFile().getFileName().replaceAll("\\s", "_");
int mid = fileName1.lastIndexOf(".");
String fname = fileName1.substring(0, mid);
InputStream inputStream = event.getFile().getInputstream();
String ext = fileName1.substring(mid + 1, fileName1.length());
FileUploadDownload fileUploadDownload = new FileUploadDownload();
File file1 = new File(LoginBean.uploadPath + "/generatedagreements");
if (!file1.exists()) {
if (file1.mkdir()) {
}
}
File file2 = new File(LoginBean.uploadPath + "/generatedagreements");
if (!file2.exists()) {
if (file2.mkdir()) {
}
}
String path = "/generatedagreements";
saved_file = fileUploadDownload.upload(path, fname, ext, inputStream);
list.add(new FileInputStream(new File(LoginBean.uploadPath + "generatedagreements/" + saved_file)));
}
mergeFiles();
st.close();
con.close();
} catch (Exception e) {
logger.error("Exception"+e.getMessage());
e.printStackTrace();
System.out.println("ERROR AT Upload" + e.getLocalizedMessage());
}
}
public void concatPDFs(List<InputStream> streamOfPDFFiles,
OutputStream outputStream, boolean paginate) throws DocumentException, IOException {
Document document = new Document();
try {
List<InputStream> pdfs = streamOfPDFFiles;
List<PdfReader> readers = new ArrayList<PdfReader>();
int totalPages = 0;
Iterator<InputStream> iteratorPDFs = pdfs.iterator();
// Create Readers for the pdfs.
while (iteratorPDFs.hasNext()) {
InputStream pdf = iteratorPDFs.next();
PdfReader pdfReader = new PdfReader(pdf);
readers.add(pdfReader);
totalPages += pdfReader.getNumberOfPages();
}
// Create a writer for the outputstream
PdfWriter writer = PdfWriter.getInstance(document, outputStream);
document.open();
BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA,
BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
PdfContentByte cb = writer.getDirectContent(); // Holds the PDF
// data
PdfImportedPage page;
int currentPageNumber = 0;
int pageOfCurrentReaderPDF = 0;
Iterator<PdfReader> iteratorPDFReader = readers.iterator();
// Loop through the PDF files and add to the output.
while (iteratorPDFReader.hasNext()) {
PdfReader pdfReader = iteratorPDFReader.next();
// Create a new page in the target for each source page.
while (pageOfCurrentReaderPDF < pdfReader.getNumberOfPages()) {
document.newPage();
pageOfCurrentReaderPDF++;
currentPageNumber++;
page = writer.getImportedPage(pdfReader,
pageOfCurrentReaderPDF);
cb.addTemplate(page, 0, 0);
// Code for pagination.
if (paginate) {
cb.beginText();
cb.setFontAndSize(bf, 9);
cb.showTextAligned(PdfContentByte.ALIGN_CENTER, ""
+ currentPageNumber + " of " + totalPages, 520,
5, 0);
cb.endText();
}
}
pageOfCurrentReaderPDF = 0;
}
outputStream.flush();
document.close();
outputStream.close();
} catch (Exception e) {
logger.error("Exception"+e.getMessage());
e.printStackTrace();
} finally {
if (document.isOpen()) {
document.close();
}
try {
if (outputStream != null) {
outputStream.close();
}
} catch (IOException ioe) {
logger.error("Exception"+ioe.getMessage());
ioe.printStackTrace();
}
}
}
public void mergeFiles() {
OutputStream out = null;
try {
Date dNow = new Date();
SimpleDateFormat ft = new SimpleDateFormat("yyyyMMddHHmmss");
System.out.println("Current Date: " + ft.format(dNow));
String fileName = ft.format(dNow) + "." + "pdf";
out = new FileOutputStream(new File(LoginBean.uploadPath + "generatedagreements/" + fileName));
mergeFile = LoginBean.uploadPath + "generatedagreements/" + fileName;
try {
// doMerge(list, out);
concatPDFs(list, out, true);
FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Contract Forms", "File Genarated");
RequestContext.getCurrentInstance().showMessageInDialog(message);
} catch (DocumentException ex) {
logger.error("Exception"+ex.getMessage());
//Logger.getLogger(AgreementsBean.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
logger.error("Exception"+ex.getMessage());
//Logger.getLogger(AgreementsBean.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (FileNotFoundException ex) {
logger.error("Exception"+ex.getMessage());
//Logger.getLogger(AgreementsBean.class.getName()).log(Level.SEVERE, null, ex);
} finally {
try {
out.close();
} catch (IOException ex) {
logger.error("Exception"+ex.getMessage());
//Logger.getLogger(AgreementsBean.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
agreements.xhtml
<div class="col-md-12">
<p:fileUpload mode="advanced" dragDropSupport="false" fileUploadListener="#{agreementsBean.handleFileUpload}"
multiple="true" fileLimit="5" allowTypes="/(\.|\/)(pdf)$/" />
<p:commandLink oncomplete="PF('mergepdf').show();" action="#{agreementsBean.mergeFiles}"
rendered="#{agreementsBean.downloadEnable}" ><i class="fa fa-file-pdf-o fa-3x" aria-hidden="true"></i></p:commandLink>
</div>
的web.xml
<filter>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<filter-class>
org.primefaces.webapp.filter.FileUploadFilter
</filter-class>
<init-param>
<description>Maximum size of stored in memory file</description>
<param-name>thresholdSize</param-name>
<param-value>20097152</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
</filter-mapping>
<context-param>
<param-name>primefaces.UPLOADER</param-name>
<param-value>auto</param-value>
</context-param>
通过调试，我发现即使上传了两个文件，event参数也只有一个文件。但无法解决问题所在。