iText Java - 将标题添加到现有pdf [英] iText Java - add header to an existing pdf
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问题描述
我想使用iText为现有的pdf添加标题。
I want to add an header to an existing pdf using iText.
除了有时我的函数创建带有正确页眉和页脚的pdf之外我没有问题但是旋转现有的pdf页面。
I had no problem except that sometimes my function create a pdf with the correct header and footer but with the existing pdf page rotated.
private static void print(Sldocuments item, String header, String footer) {
try {
String ftpFilename = item.getId()+"_"+item.getDocumentname();
String newName= String.valueOf(item.getId())+".pdf";
String path = (Global.SHARED_FOLDER_DEVELOPER);
String smbUser = "**;"+"**" + ":" + "**";
NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(smbUser);
SmbFile sFile = new SmbFile(path+ftpFilename, auth);
InputStream in = sFile.getInputStream();
PdfReader reader = new PdfReader(in);
// Create output PDF
Document document = new Document(PageSize.A4);
SmbFile sFileOut = new SmbFile(path+newName, auth);
SmbFileOutputStream sfos = new SmbFileOutputStream(sFileOut);
PdfWriter writer = PdfWriter.getInstance(document, sfos);
document.open();
PdfContentByte pdfContentByte = writer.getDirectContent();
for (int i = 1; i <= reader.getNumberOfPages(); i++) {
PdfImportedPage page = writer.getImportedPage(reader, i);
document.newPage();
pdfContentByte.add(page);
// Write header
writeText(headerPositionX, headerPositionY, header);
// Write footer
writeText(footerPositionX, footerPositionY, footer);
// Write page number
String pageNumber = "pagina "+ i +" di " + reader.getNumberOfPages();
writeText(pageNumberPositionX, pageNumberPositionY, pageNumber);
}
document.close();
reader.close();
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
我尝试使用<修复我的问题/ p>
I tried fix my problem using
AffineTransform af = new AffineTransform();
af.setToRotation(Math.toRadians(page.getRotation()));
pdfContentByte.addTemplate(page, af);
简单的实例
pdfContentByte.add(page);
但是通过这种转换,导入的页面完全从我的新pdf中丢失(可能因为我旋转了页面使用错误的锚点)。
but with this transformation, the imported page is totally missing from my new pdf (maybe cause I rotate the page using a wrong anchor point).
我如何实现目标?
推荐答案
根据mkl,我使用了PdfStamper:
According to mkl I used the PdfStamper:
private static void print(Sldocuments item, String header, String footer) {
try {
String ftpFilename = item.getId()+"_"+item.getDocumentname();
String newName= String.valueOf(item.getId())+".pdf";
String path = (Global.SHARED_FOLDER_DEVELOPER);
String smbUser = "**;"+"**" + ":" + "**";
NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(smbUser);
SmbFile sFile = new SmbFile(path+ftpFilename, auth);
InputStream in = sFile.getInputStream();
PdfReader reader = new PdfReader(in);
// Create output PDF
SmbFile sFileOut = new SmbFile(path+newName, auth);
SmbFileOutputStream sfos = new SmbFileOutputStream(sFileOut);
PdfStamper stamper = new PdfStamper(reader, sfos);
// Loop over the pages and add a header to each page
int n = reader.getNumberOfPages();
for (int i = 1; i <= n; i++) {
//add header
PdfPTable table = new PdfPTable(1);
table.setTotalWidth(PDF_PAGE_SIZE.getWidth()-(headerPositionX*2));
table.setLockedWidth(true);
table.getDefaultCell().setFixedHeight(20);
table.getDefaultCell().setBorder(Rectangle.NO_BORDER);
table.addCell(header);
table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_RIGHT);
table.addCell("");
table.writeSelectedRows(0, -1, headerPositionX, headerPositionY, stamper.getOverContent(i));
//add footer
PdfPTable tableFooter = new PdfPTable(2);
tableFooter.setTotalWidth(PDF_PAGE_SIZE.getWidth()-(footerPositionX*2));
tableFooter.setLockedWidth(true);
tableFooter.getDefaultCell().setFixedHeight(20);
tableFooter.getDefaultCell().setBorder(Rectangle.NO_BORDER);
tableFooter.addCell(footer);
tableFooter.getDefaultCell().setHorizontalAlignment(Element.ALIGN_RIGHT);
tableFooter.addCell(String.format("pagina %d of %d", i, n));
tableFooter.writeSelectedRows(0, -1, footerPositionX, footerPositionY*4, stamper.getOverContent(i));
}
// Close the stamper
stamper.close();
reader.close();
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
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