创建pdf并与pdfbox合并

这就是我想要做的：

1. 使用pdfbox制作2个不同的pdf文件

2. 使用pdfmerger将这两个文件合并在一起

如果我将＃1保存到服务器端本地硬盘驱动器并加载＃2的文件，我知道如何做到这一点。 但我想要做的是“直接从记忆中”使用。 我已经从这个pdfbox中搜索了所有方法，但仍然无法找到它。

这是我从本地文件获取的代码

谢谢。

import java.io.BufferedOutputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import org.apache.pdfbox.exceptions.COSVisitorException; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDPage; import org.apache.pdfbox.pdmodel.edit.PDPageContentStream; import org.apache.pdfbox.pdmodel.font.PDFont; import org.apache.pdfbox.pdmodel.font.PDTrueTypeFont; import org.apache.pdfbox.pdmodel.font.PDType1Font; import org.apache.pdfbox.util.PDFMergerUtility; /** * This is an example that creates a simple document * with a ttf-font. * * @author Michael Niedermair * @version $Revision: 1.2 $ */ public class Test2 { /** * create the second sample document from the PDF file format specification. * * @param file The file to write the PDF to. * @param message The message to write in the file. * @param fontfile The ttf-font file. * * @throws IOException If there is an error writing the data. * @throws COSVisitorException If there is an error writing the PDF. */ public void doIt(final String file, final String message) throws IOException, COSVisitorException { // the document PDDocument doc = null; try { doc = new PDDocument(); PDPage page = new PDPage(); doc.addPage(page); PDFont font = PDType1Font.HELVETICA_BOLD; PDPageContentStream contentStream = new PDPageContentStream(doc, page); contentStream.beginText(); contentStream.setFont(font, 12); contentStream.moveTextPositionByAmount(100, 700); contentStream.drawString(message); contentStream.endText(); contentStream.close(); doc.save(file); System.out.println(file + " created!"); } finally { if (doc != null) { doc.close(); } } } /** * This will create a hello world PDF document * with a ttf-font. * 
 * see usage() for commandline * * @param args Command line arguments. */ public static void main(String[] args) { Test2 app = new Test2(); Test2 app2 = new Test2(); try { app.doIt("C:/here.pdf", "hello"); app2.doIt("C:/here2.pdf", "helloagain"); PDFMergerUtility merger = new PDFMergerUtility(); merger.addSource("C:/here.pdf"); merger.addSource("C:/here2.pdf"); OutputStream bout2 = new BufferedOutputStream(new FileOutputStream("C:/hereisthefinal.pdf")); merger.setDestinationStream(bout2); merger.mergeDocuments(); } catch (COSVisitorException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } 

Answer 1

您只需要使用PdfMergeUtility.addSource(InputStream)方法从输入流而不是从物理文件添加源。

快速浏览一下API，你可以做的是使用PDDocument.save(OutputStream)方法将文件写入内存中的字节数组，这样的事情应该可行。

 static byte[] doIt(String message) { PDDocument doc = new PDDocument(); // add the message ByteArrayOutputStream baos = new ByteArrayOutputStream(); doc.save(baos); return baos.toByteArray(); } void main(String args[]) { byte[] pdf1 = doIt("hello"); byte[] pdf2 = doIt("world"); PDFMergerUtility merger = new PDFMergerUtility(); merger.addSource(new ByteArrayInputStream(pdf1)); merger.addSource(new ByteArrayInputStream(pdf2)); // do the rest with the merger } 

Answer 2

我使用它来合并一些文档（InputStreams）并在HttpServletResponse中编写合并文档。

  PDFMergerUtility mergedDoc = new PDFMergerUtility(); ByteArrayOutputStream colDocOutputstream = new ByteArrayOutputStream(); for (int i = 0; i < documentCount; i++) { ByteArrayOutputStream tempZipOutstream = new ByteArrayOutputStream(); ... mergedDoc.addSource(new ByteArrayInputStream(tempZipOutstream.toByteArray())); } mergedDoc.setDestinationStream(colDocOutputstream); mergedDoc.mergeDocuments(); response.setContentLength(colDocOutputstream.size()); response.setContentType("application/pdf"); response.setHeader("Content-Disposition", "attachment; filename=mergedDocument.pdf"); response.setHeader("Pragma", "public"); response.setHeader("Cache-Control", "max-age=0"); response.addDateHeader("Expires", 0); response.getOutputStream().write(colDocOutputstream.toByteArray()); 

Answer 3

您也可以这样使用： –
1）创建InputStream列表
2）实例化PDFMergerUtility类
3）设置目标输出流
4）将所有InputStream添加到PDFMerger作为需要合并的源文件。
5）通过调用“ PDFmerger.mergeDocuments(); ”合并文档PDFmerger.mergeDocuments();

  List locations=new ArrayList(); locations.add(new FileInputStream("E:/Filenet Project Support/MergePDFs_Sample_Code/Attorney_new_form.pdf")); locations.add(new FileInputStream("E:/Filenet Project Support/MergePDFs_Sample_Code/JH.pdf")); locations.add(new FileInputStream("E:/Filenet Project Support/MergePDFs_Sample_Code/Interpreter_new_form.pdf")); //Instantiating PDFMergerUtility class PDFMergerUtility PDFmerger = new PDFMergerUtility(); //Setting Destination Output Stream OutputStream out = new FileOutputStream("E:/Filenet Project Support/MergePDFs_Sample_Code/merged.pdf"); //Adding all InputStreams to PDFMerger as Source files which needs to be merged. PDFmerger.addSources(locations); //Setting Destination Output Stream PDFmerger.setDestinationStream(out); //Merging the two documents PDFmerger.mergeDocuments(); System.out.println("Documents merged");