web批量打印pdf

思路：在java后端先把要打印的pdf合并，然后在前端调用浏览器的打印功能.

1，java 合并pdf

public void concatPDFs(List<InputStream> streamOfPDFFiles, OutputStream outputStream, boolean paginate) { Document document = new Document(); try { List<InputStream> pdfs = streamOfPDFFiles; List<PdfReader> readers = new ArrayList<PdfReader>(); int totalPages = 0; Iterator<InputStream> iteratorPDFs = pdfs.iterator(); // Create Readers for the pdfs. while (iteratorPDFs.hasNext()) { InputStream pdf = iteratorPDFs.next(); PdfReader pdfReader = new PdfReader(pdf); readers.add(pdfReader); totalPages += pdfReader.getNumberOfPages(); } // Create a writer for the outputstream PdfWriter writer = PdfWriter.getInstance(document, outputStream); document.open(); BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED); PdfContentByte cb = writer.getDirectContent(); // Holds the PDF // data PdfImportedPage page; int currentPageNumber = 0; int pageOfCurrentReaderPDF = 0; Iterator<PdfReader> iteratorPDFReader = readers.iterator(); // 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()) { document.newPage(); pageOfCurrentReaderPDF++; currentPageNumber++; page = writer.getImportedPage(pdfReader, pageOfCurrentReaderPDF); cb.addTemplate(page, 0, 0); // Code for pagination. if (paginate) { cb.beginText(); cb.setFontAndSize(bf, 9); cb.showTextAligned(PdfContentByte.ALIGN_CENTER, "" + currentPageNumber + " of " + totalPages, 520, 5, 0); cb.endText(); } } pageOfCurrentReaderPDF = 0; } outputStream.flush(); document.close(); outputStream.close(); } catch (Exception e) { e.printStackTrace(); } finally { if (document.isOpen()) document.close(); try { if (outputStream != null) outputStream.close(); } catch (IOException ioe) { ioe.printStackTrace(); } } }

2,前端

var innerHTML = "<iframe class='printIframe' width='100%' height='500px' src='"+url+"' ></iframe>"; $("#printDiv").html(innerHTML); $("#printDiv .printIframe")[0].contentWindow.print();