转载地址：/code-snippet/1922/java-usage-itext-hebing-pdf-file
使用itext合并pdf文件很简单，首先需要创建要合并pdf文件的InputStream对象，然后调用MergePDF.concatPDF()静态方法。
在contactPDF()方法中将输入的Pdf文件流转换成一系列的PdfWriter对象，并记录每一个输入流对应pdf文件的总页数。
然后创建一个BaseFont对象，这个对象用来写页码。然后创建一个Output对象来写要合并的pdf。最后关闭所有的流
ackage cn.outofmemory.itext.pdf;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import com.lowagie.text.Document;import com.lowagie.text.pdf.BaseFont;import com.lowagie.text.pdf.PdfContentByte;import com.lowagie.text.pdf.PdfImportedPage;import com.lowagie.text.pdf.PdfReader;import com.lowagie.text.pdf.PdfWriter;public class MergePDF {public static void main(String[] args) {try {List<InputStream> pdfs = new ArrayList<InputStream>();pdfs.add(new FileInputStream("c:\\1.pdf"));pdfs.add(new FileInputStream("c:\\2.pdf"));OutputStream output = new FileOutputStream("c:\\merge.pdf");MergePDF.concatPDFs(pdfs, output, true);} catch (Exception e) {e.printStackTrace();}}public static 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 outputstreamPdfWriter 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// dataPdfImportedPage 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();}}}}
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