My web project combines a few pdf files into a single pdf. I can store the
combined pdf to a file no problem, It's when I try to send the combined pdf to
the browser that nothing happens. I have tested sending a Hello World pdf to
the browser and that works. Here is my code.
if (pageAction.equals("combinePDF")) {
String thesePdfs = request.getParameter("thesePdfs");
logger.info("Process these form id " + thesePdfs);
/*
don't want to create the combined pdf in memory there may not
be enough to handle it.
*/
ResourceBundle pdf_bundle = ResourceBundle.getBundle("pdffilepath");
String outFile = pdf_bundle.getString("combinedfiles") + "\\" +
"CombinedPdf.pdf";
StringTokenizer st = new StringTokenizer(thesePdfs, ",");
// used for testing not all formid's have a pdf
// StringTokenizer st = new StringTokenizer("575,751,761", ",");
response.setContentType("application/pdf");
try {
int pageOffset = 0;
ArrayList masterBookMarkList = new ArrayList();
Document document = null;
PdfCopy writer = null;
PdfReader reader = null;
boolean firstFile = true;
while(st.hasMoreElements()) {
/*
* with the form id
*/
int formId = Integer.parseInt(st.nextToken());
logger.info("Getting DF for formid - " + formId);
DownloadForm df = downloadFormDao.select(formId);
/*
* if df is null the form doesn't exist a message about the non-existent
* form is to be returned
*/
if(df == null){
// put error in session
logger.info("This form id " + formId + " is not in the DownloadForm
table");
continue;
}
/**
* Create a reader for the file that we are reading
*/
reader = new PdfReader(df.getFilecontent());
/**
* Replace all the local named links with the actual
* destinations.
*/
reader.consolidateNamedDestinations();
/**
* Retrieve the total number of pages for this document
*/
int totalPages = reader.getNumberOfPages();
logger.info("# of pages " + totalPages);
/**
* Get the list of bookmarks for the current document If the
* bookmarks are not empty, store the bookmarks into a master
* list
*/
logger.info("Checking for bookmarks...");
List bookmarks = SimpleBookmark.getBookmark(reader);
if (bookmarks != null) {
if (pageOffset != 0)
SimpleBookmark.shiftPageNumbers(bookmarks, pageOffset, null);
masterBookMarkList.addAll(bookmarks);
logger.info("Bookmarks found and storing...");
} else {
logger.info("No bookmarks in this file...");
}
pageOffset += totalPages;
/**
* Merging the files to the first file. If we are passing file1,
* file2 and file3, we will merge file2 and file3 to file1.
*/
if(firstFile){
/**
* Create the document object from the reader
*/
document = new Document(reader.getPageSizeWithRotation(1));
/**
* Create a pdf writer that listens to this document. Any
* changes to this document will be written to the outFile
*
* outFile is a location where the final merged document
* will be written to.
*/
logger.info("Creating an empty PDF...");
writer = new PdfCopy(document, new FileOutputStream(outFile));
// writer = new PdfCopy(document, response.getOutputStream());
/**
* Open this document
*/
document.open();
firstFile = false;
}
/**
* Add the content of the file into this document (writer). Loop
* through multiple Pages
*/
PdfImportedPage page;
for (int currentPage = 1; currentPage <= totalPages; currentPage++) {
page = writer.getImportedPage(reader, currentPage);
writer.addPage(page);
}
/**
* This will get the documents acroform. This will return null
* if no acroform is part of the document.
*
* Acroforms are PDFs that have been turned into fillable forms.
*/
logger.info("Checking for Acroforms");
PRAcroForm form = reader.getAcroForm();
if (form != null) {
writer.copyAcroForm(reader);
logger.info("Acroforms found and copied");
} else
logger.info("Acroforms not found for this file");
} // end of selectledPdfFiles for loop
/**
* After looping through all the files, add the master bookmarklist.
* If individual PDF documents had separate bookmarks, master
* bookmark list will contain a combination of all those bookmarks
* in the merged document.
*/
if (!masterBookMarkList.isEmpty()) {
writer.setOutlines(masterBookMarkList);
logger.info("All bookmarks combined and added");
} else {
logger.info("No bookmarks to add in the new file");
}
writer.close();
/**
* Finally Close the main document, which will trigger the pdfcopy
* to write back to the filesystem.
*/
document.close();
logger.info("File has been merged and written to response output");
logger.info("OutputStream string length " +
response.getOutputStream().toString().length());
logger.info(response.getOutputStream().toString());
response.flushBuffer();
logger.info("Have sent the combined PDF to the response output");
} catch (Exception e) {
e.printStackTrace();
}
return;
}
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