Robin Zhao wrote:
Hi all,
How to merge multiple PDF into a temporary PDF and show on browser?
That's as easy as 1, 2, 3.
temporary means don't save in hardisk.
Then why do you write the file to merge.pdf using a FileOutputStream?
I added some hints to your code.
I don't claim they will work immediately.
MergePDF.servlet:
...
public void run() {
//use ArrayList save file name, because it may be many file
ArrayList aList = new ArrayList();
aList.add("ChapterSection.pdf");
aList.add("SimpleAnnotations1.pdf");
//call another class to merge PDF
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ConcatenateForms merge = new ConcatenateForms(baos);
merge.mergePDF(aList);
boas.writeTo(response.getOutputStream());
}
ConcatenateForms.java:
ByteArrayOutputStream baos;
public ConcatenateForms(ByteArrayOutputStream baos) {
this.baos = baos;
}
public void mergePDF(ArrayList filename) {
...
try {
int pageOffset = 0;
ArrayList master = new ArrayList();
int f = 0;
int count = 0;
count = filename.size();
/*
String outFile = "Merge.pdf";
*/
Document document = null;
PdfCopy writer = null;
while (f < count -1) {
// we create a reader for a certain document
PdfReader reader = new
PdfReader((String)(filename.get(count)));
reader.consolidateNamedDestinations();
// we retrieve the total number of pages
int n = reader.getNumberOfPages();
List bookmarks = SimpleBookmark.getBookmark(reader);
if (bookmarks != null) {
if (pageOffset != 0)
SimpleBookmark.shiftPageNumbers(bookmarks,
pageOffset, null);
master.addAll(bookmarks);
}
pageOffset += n;
if (f == 0) {
// step 1: creation of a document-object
document = new
Document(reader.getPageSizeWithRotation(1));
// step 2: we create a writer that listens to
the document
writer = new PdfCopy(document,
baos
/*
new FileOutputStream(outFile)
*/
);
// step 3: we open the document
document.open();
}
// step 4: we add content
PdfImportedPage page;
for (int i = 0; i < n; ) {
++i;
page = writer.getImportedPage(reader, i);
writer.addPage(page);
}
PRAcroForm form = reader.getAcroForm();
if (form != null)
writer.copyAcroForm(reader);
f++;
}
if (master.size() > 0)
writer.setOutlines(master);
// step 5: we close the document
document.close();
}
catch(Exception e) {
e.printStackTrace();
}
...
}
br,
Bruno
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