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Unable to read PDF using itextpdf

I am using itextpdf-5.5.4 jar to merge or add two pdf into one PDF.
I did not get any error or exception while running code but displayed below text in Merged PDF. I did not get below text when i open individual PDF's.
The document you are trying to load requires Adobe Reader 8 or higher.
You may not have the Adobe Reader installed or your viewing
environment may not be properly configured to use Adobe Reader.
For information on how to install Adobe Reader and configure your
viewing environment please see
http://www.adobe.com/go/pdf_forms_configure.
void mergePdfFiles(List<InputStream> inputPdfList, OutputStream outputStream) throws Exception {
// Create document and pdfReader objects.
Document document = new Document();
List<PdfReader> readers = new ArrayList<PdfReader>();
int totalPages = 0;
// Create pdf Iterator object using inputPdfList.
Iterator<InputStream> pdfIterator = inputPdfList.iterator();
// Create reader list for the input pdf files.
while (pdfIterator.hasNext()) {
InputStream pdf = pdfIterator.next();
PdfReader pdfReader = new PdfReader(pdf);
readers.add(pdfReader);
totalPages = totalPages + pdfReader.getNumberOfPages();
}
// Create writer for the outputStream
PdfWriter writer = PdfWriter.getInstance(document, outputStream);
// Open document.
document.open();
// Contain the pdf data.
PdfContentByte pageContentByte = writer.getDirectContent();
PdfImportedPage pdfImportedPage;
int currentPdfReaderPage = 1;
Iterator<PdfReader> iteratorPDFReader = readers.iterator();
// Iterate and process the reader list.
while (iteratorPDFReader.hasNext()) {
PdfReader pdfReader = iteratorPDFReader.next();
// Create page and add content.
while (currentPdfReaderPage <= pdfReader.getNumberOfPages()) {
document.newPage();
pdfImportedPage = writer.getImportedPage(pdfReader, currentPdfReaderPage);
pageContentByte.addTemplate(pdfImportedPage, 0, 0);
currentPdfReaderPage++;
}
currentPdfReaderPage = 1;
}
// Close document and outputStream.
outputStream.flush();
document.close();
outputStream.close();
System.out.println("Pdf files merged successfully.");
}
public static void main(String args[]) {
try {
List<InputStream> inputPdfList = new ArrayList<InputStream>();
inputPdfList.add(new FileInputStream("pdf1.pdf"));
inputPdfList.add(new FileInputStream("pdf2.pdf"));
OutputStream outputStream = new FileOutputStream("Merge-PDF.pdf");
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
mergePdfFiles(inputPdfList, byteStream);
byte[] byteS = byteStream.toByteArray();
outputStream.write(byteS);
} catch (Exception e) {
e.printStackTrace();
}
}
Please help me out on this.

Java JPA retrieve blob from oracle database as its original file type

I am using java spring and jpa I have a query to retrieve the blob from an oracle db. I get the blob and if it is a text file it is downloading onto my local machine just fine - but if it is an image I have to go through a BufferedImage, and I am still working on PDF. So far I'm just seeing the extension of the file by getting it's original filename which is also stored in the DB, then filtering the string for the extension. When I get a PDF it says the file is corrupted or open in another window, which it is not.
So far, this is my code that tries to turn blob from DB into a file:
Blob blob = Service.retrieveBlob(ID);
if (blob == null){
return false;
}
String fileName = Service.getFileName(ID);
String extension = fileName.substring(fileName.lastIndexOf('.') + 1);
System.out.println(extension);
if (extension.equals("jpg") || (extension.equals("png"))){
File file = new File("./DBPicture.png");
try(FileOutputStream outputStream = new FileOutputStream(file)) {
BufferedImage bufferedImage = ImageIO.read(blob.getBinaryStream());
ImageIO.write(bufferedImage, "png", outputStream);
System.out.println("Image file location: "+file.getCanonicalPath());
} catch (IOException e) {
e.printStackTrace();
}
}
else {
InputStream ins = blob.getBinaryStream();
byte[] buffer = new byte[ins.available()];
ins.read(buffer);
File targetFile = new File("./" + fileName);
OutputStream outStream = new FileOutputStream(targetFile);
outStream.write(buffer);
}

available is simply that. it is not necessarily the length of the stream.
Try something like
InputStream ins = blob.getBinaryStream();
File targetFile = new File("./" + fileName);
OutputStream outStream = new FileOutputStream(targetFile);
byte[] buffer = new byte[8000];
int count = 0;
while ((count = ins.read(buffer)) != -1) {
outStream.write(buffer);
}
// then close your output
outStream.close ();

iTextPDF - Unable to convert HTML to PDF

I am building a Java web service application in which I would like to convert the HTML file to PDF and send an email to a particular email address.
Conversion from XHTML to PDF.
try {
File outputFile = new File("D:\\Files\\Output_Files\\" + System.currentTimeMillis() + ".pdf");
OutputStream file = new FileOutputStream(outputFile);
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, file);
document.open();
InputStream is = new ByteArrayInputStream(htmlString.getBytes());
XMLWorkerHelper.getInstance().parseXHtml(writer, document,is);
document.close();
file.close();
} catch (IOException e) {
e.printStackTrace();
}
I have verified htmlString and it holds an exact HTML string.
Please review my HTML content here
The issue is that I am receiving the PDF but it does not have any content but an empty page.

How can I merge the documents consisting PDFs as well as images?

In my current code I am merging the documents consisting PDF files.
public static void appApplicantDownload(File file) {
Connection con = getConnection();
Scanner sc = new Scanner(System.in);
List < InputStream > list = new ArrayList < InputStream > ();
try {
OutputStream fOriginal = new FileOutputStream(file, true); // original
list.add(new FileInputStream(file1));
list.add(new FileInputStream(file2));
list.add(new FileInputStream(file3));
doMerge(list, fOriginal);
} catch (Exception e) {
}
}
public static void doMerge(List < InputStream > list, OutputStream outputStream) throws DocumentException, IOException {
try {
System.out.println("Merging...");
Document document = new Document();
PdfCopy copy = new PdfCopy(document, outputStream);
document.open();
for (InputStream in : list) {
ByteArrayOutputStream b = new ByteArrayOutputStream();
IOUtils.copy( in , b);
PdfReader reader = new PdfReader(b.toByteArray());
for (int i = 1; i <= reader.getNumberOfPages(); i++) {
copy.addPage(copy.getImportedPage(reader, i));
}
}
outputStream.flush();
document.close();
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
But now I want to change the code such that it should allow Image as well as PDFs to be merged. Above code is giving me the error that No PDF Signature found

First, you have to know somehow if the file is a PDF or an image. The easiest way would be to use the extension of the file. So you would have get extension of the file and then pass this information to your doMerge method. Do achieve that, I would change your current method
public static void doMerge(List<InputStream> list, OutputStream outputStream)
For something like
public static void doMerge(Map<InputStream, String> files, OutputStream outputStream)
So each InputStream is associated with a extension.
Second, you have to load images and pdf seperately. So your loop should look like
for (InputStream in : files.keySet()) {
String ext = files.get(in);
if(ext.equalsIgnoreCase("pdf"))
{
//load pdf here
}
else if(ext.equalsIgnoreCase("png") || ext.equalsIgnoreCase("jpg"))
{
//load image here
}
}
In java, you can easily load an Image using ImageIO. Look at this question for more details on this topic: Load image from a filepath via BufferedImage
Then to add your image into the PDF, use the PdfWriter
PdfWriter pw = PdfWriter.GetInstance(doc, outputStream);
Image img = Image.GetInstance(inputStream);
doc.Add(img);
doc.NewPage();
If you want to convert your image into PDF before and merge after you also can do that but you just have to use the PdfWriter to write them all first.

Create a new page in the opened PDF document and use the function for inserting images to place the image on that page.

Convert html source to pdf using iText

I have an html file, which is generated as a response by my site.
While opening the html file in my browser, all the images and other elements are displaying properly. Moreover, I want to convert this html file into a pdf file.
So am using iText API to generate the pdf file.
In the html file images and texts are located horizontally.
But in the generated pdf output the images are displaying vertically.
code
String k = convertString();
OutputStream file = new FileOutputStream(new File("f:\\Test.pdf"));
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, file);
document.open();
InputStream is = new ByteArrayInputStream(k.getBytes());
XMLWorkerHelper.getInstance().parseXHtml(writer, document, is);
document.close();
file.close();
private static String convertString() {
StringBuilder contentBuilder = new StringBuilder();
try {
BufferedReader in = new BufferedReader(new FileReader("f://testPage.html"));
String str;
while ((str = in.readLine()) != null) {
contentBuilder.append(str);
}
in.close();
} catch (IOException e) {
}
String content = contentBuilder.toString();
return content;
}
How can I generate a pdf that looks exactly the same as the appearance of the html UI?
Also, in Jfiddle, the html page is not displaying properly. What am I missing? Is the problem with my HTML, or is there some deeper issue with Jfiddle or something else at work?