我使用下面的代码从 ftp 服务器检索文件并将其显示在浏览器中。
boolean fileFormatType = fileName.endsWith(".PDF");
if (fileFormatType) {
if (FilePdf != null && FilePdf.length() > 0) {
is = ftp.retrieveFileStream(strFile);
bis = new BufferedInputStream(is);
response.reset();
response.setContentType("application/pdf");
response.setHeader("Content-Disposition",
"inline;filename=example.pdf");
ServletOutputStream outputStream = response
.getOutputStream();
System.out.println("here ");
byte[] buffer = new byte[1024];
int readCount;
while ((readCount = bis.read(buffer)) > 0){
outputStream.write(buffer, 0, readCount);
}
outputStream.flush();
outputStream.close();
}
} else {
is = ftp.retrieveFileStream(strFile);
ByteArrayOutputStream baos = convertTIFFtoPDF(is);
response.setContentType("application/pdf");
response.setContentLength(baos.size());
response.setHeader("Content-disposition",
"attachment;filename=\"" + "importDocs.pdf" + "\"");
ServletOutputStream out = response.getOutputStream();
baos.writeTo(out);
out.flush();
out.close();
但现在，我需要将多个文件添加到一个文件夹中(该文件夹可能包含 PDF 和 TIFF)，并在浏览器中一次显示所有文件。过去三天我一直在尝试，但没有成功。我可以在这里发布我尝试过的代码，但我想要一个新的意见/方法。请帮我解决这个问题。我正在使用 itextpdf5.1 commons-io.util api
顺便说一句，我得到了负数组大小异常。
最佳答案
这是我的问题的最终答案。
for (PdfBean pdfBean : list)
{
if(!pdfBean.getFileName().isEmpty()&&!pdfBean.getFileLocation().isEmpty()){
msgDH.InsertUserHistDtls(pdfBean.getHawb(), userId, pdfBean.getCustomer(), pdfBean.getFileName(), pdfBean.getProduct(), pdfBean.getDocType(), "Print");
msgDH.InsertLogDtls(pdfBean.getFileName(), pdfBean.getProduct(), pdfBean.getCustomer(), userId);
FTPClient ftp = new FTPClient();
int tiffPages = 0;
try
{
ftp.connect(ftpserver);
} catch (SocketException e1)
{
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1)
{
// TODO Auto-generated catch block
e1.printStackTrace();
}
try
{
boolean login = ftp.login(ftpusername, ftppassword);
} catch (IOException e1)
{
// TODO Auto-generated catch block
e1.printStackTrace();
}
int reply;
reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply))
{
ftp.disconnect();
System.out.println("FTP server refused connection.");
} else
{
// ftp.enterLocalPassiveMode();
ftp.enterLocalActiveMode();
ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
ftp.changeWorkingDirectory(pdfBean.getFileLocation());
/* FTPFile[] */
ftpFiles = ftp.listFiles();
/* FTPFile[] */// ftpFiles = ftp.listFiles();
// ftp.completePendingCommand();
}
String fileName = pdfBean.getFileLocation() + "/"
+ pdfBean.getFileName();
if ("/interface/oracle/dds/generic/hold/TIF"
.equalsIgnoreCase(pdfBean.getFileLocation()))
{
int i = 0;
String F = pdfBean.getFileName().replaceAll(".PDF",
".TIF");
// FTPFile[] ftpFiles =
// ftp.listFiles(pdfBean.getFileLocation());
for (FTPFile ftpFile : ftpFiles)
{
if (ftpFile.getName().equals(F))
{
fileName = pdfBean.getFileLocation()
.concat("/").concat(F);
i = 1;
}
}
if (i == 0)
{
F = pdfBean.getFileName().replaceAll(".PDF",
".TIFF");
for (FTPFile ftpFile : ftpFiles)
{
if (ftpFile.getName().equals(F))
{
fileName = pdfBean.getFileLocation()
.concat("/").concat(F);
i = 1;
}
}
}
int Repcode = ftp.getReplyCode();
//
// System.out.println(Repcode);
/* if(fileName.endsWith(".TIF")) */
InputStream is = (InputStream) ftp.retrieveFileStream(fileName);
Repcode = ftp.getReplyCode();
System.out.println(Repcode);
// ftp.completePendingCommand();
Repcode = ftp.getReplyCode();
System.out.println(Repcode);
ra1 = new RandomAccessFileOrArray(is);
tiffPages = TiffImage.getNumberOfPages(ra1);
System.out.println("No of pages in image is : "
+ tiffPages);
for (int a = 1; a <= tiffPages; a++)
{
try
{
Image img = TiffImage.getTiffImage(ra1, a);
if (img != null)
{
if (img.getScaledWidth() > 500
|| img.getScaledHeight() > 700)
{
img.scaleToFit(800, 800);
}
doc.setPageSize(new Rectangle(img
.getScaledWidth(), img
.getScaledHeight()));
img.setAbsolutePosition(0, 0);
cb.addImage(img);
// doc.
doc.newPage();
// ++pages;
}
} catch (Throwable e)
{
System.out.println("Exception " + " page "
+ (a + 1) + " " + e.getMessage());
}
}
is.close();
ra1.close();
}
else{
InputStream pdf = ftp.retrieveFileStream(fileName);
if(pdf != null) {
PdfReader pdfRea = new PdfReader(pdf);
readers.add(pdfRea);
totalPages += pdfRea.getNumberOfPages();
}
/*totalPages += pdfRea.getNumberOfPages();
PdfImportedPage page;
int currentPageNumber = 0;
int pageOfCurrentReaderPDF = 0;
Iterator<PdfReader> iteratorPDFReader = readers.iterator();
BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA,
BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
// 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()) {
doc.newPage();
pageOfCurrentReaderPDF++;
currentPageNumber++;
page = write.getImportedPage(pdfReader, pageOfCurrentReaderPDF);
cb.addTemplate(page, 0, 0);
// Code for pagination.
cb.beginText();
cb.setFontAndSize(bf, 9);
cb.showTextAligned(PdfContentByte.ALIGN_CENTER, ""
+ currentPageNumber + " of " + totalPages, 520, 5, 0);
cb.endText();
}
pageOfCurrentReaderPDF = 0;
}*/
}
ftp.logout();
ftp.disconnect();
ftp = null;
}}
PdfImportedPage page;
int currentPageNumber = 0;
int pageOfCurrentReaderPDF = 0;
Iterator<PdfReader> iteratorPDFReader = readers.iterator();
BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA,
BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
// 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()) {
doc.newPage();
pageOfCurrentReaderPDF++;
currentPageNumber++;
page = write.getImportedPage(pdfReader, pageOfCurrentReaderPDF);
cb.addTemplate(page, 0, 0);
// Code for pagination.
cb.beginText();
cb.setFontAndSize(bf, 9);
cb.showTextAligned(PdfContentByte.ALIGN_CENTER, ""
+ currentPageNumber + " of " + totalPages, 520, 5, 0);
cb.endText();
}
pageOfCurrentReaderPDF = 0;
}
}
doc.close();
write.flush();
write.close();
System.out.println("done printing");
}
FileInputStream fiss = new FileInputStream(temp);
bis = new BufferedInputStream(fiss);
response.reset();
关于java - 将pdf和tiff添加到同一个pdf文档中并在浏览器中显示，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19591425/