如何同时进行pdf编写和复制?
我有以下要求:
首先，我想动态创建PDF. 然后，我想选择上传PDF文件. 最后，在点击打印按钮后，必须将动态创建的文件和上传的文件合并.
First I want to create a PDF dynamically. Then I want the option to upload PDF files. Finally, upon clicking a print button, both the dynamically created and the uploaded files must be merged.
单击打印"按钮时，应使用一种方法创建PDF并将其与上载的PDF合并.
When the print button is clicked, a single method should should create the PDF and combine it with the uploaded PDFs.
到目前为止，这是我的代码.
This is my code so far.
package com.sumit.program;
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.itextpdf.text.Chunk;
import com.itextpdf.text.Document;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Image;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.ColumnText;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfCopy;
import com.itextpdf.text.pdf.PdfCopy.PageStamp;
import com.itextpdf.text.pdf.PdfImportedPage;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfSmartCopy;
public class CopyOfMergePdf {
public static void main(String[] args) {
try {
List<InputStream> pdfs = new ArrayList<InputStream>();
pdfs.add(new FileInputStream("C:\\Documents and Settings\\Sumit\\Desktop\\NewEcnProject\\Landscape.pdf"));
pdfs.add(new FileInputStream("C:\\Documents and Settings\\Sumit\\Desktop\\client\\CoverSheet.pdf"));
pdfs.add(new FileInputStream("C:\\Documents and Settings\\Sumit\\Desktop\\client\\ECNPRINTTEST_BP.pdf"));
pdfs.add(new FileInputStream("C:\\Documents and Settings\\Sumit\\Desktop\\NewEcnProject\\Landscape.pdf"));
pdfs.add(new FileInputStream("C:\\Documents and Settings\\Sumit\\Desktop\\NewEcnProject\\Document1.pdf"));
pdfs.add(new FileInputStream("C:\\Documents and Settings\\Sumit\\Desktop\\NewEcnProject\\Landscape.pdf"));
pdfs.add(new FileInputStream("C:\\Documents and Settings\\Sumit\\Desktop\\NewEcnProject\\Portrait.pdf"));
OutputStream output = new FileOutputStream("C:\\Documents and Settings\\Sumit\\Desktop\\NewEcnProject\\merge1.pdf");
CopyOfMergePdf.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.
int i=1;
while (iteratorPDFs.hasNext()) {
InputStream pdf = iteratorPDFs.next();
PdfReader pdfReader = new PdfReader(pdf);
System.out.println("Page size is "+pdfReader.getPageSize(1));
readers.add(pdfReader);
totalPages += pdfReader.getNumberOfPages();
i++;
}
int j=0;
System.out.println("Total pages are "+totalPages);
// Create a writer for the outputstream
PdfCopy copy = new PdfSmartCopy(document, outputStream);
document.open();
PdfImportedPage page;
PageStamp stamp;
Chunk chunk;
BaseFont baseFont = BaseFont.createFont("arial.ttf", BaseFont.CP1252,BaseFont.EMBEDDED);
Iterator<PdfReader> iteratorPDFReader = readers.iterator();
// Loop through the PDF files and add to the output.
i=0;
PdfContentByte under;
while (iteratorPDFReader.hasNext()) {
PdfReader pdfReader = iteratorPDFReader.next();
// loop over the pages in that document
page=copy.getImportedPage(pdfReader,pdfReader.getNumberOfPages());
i=i+1;
stamp = copy.createPageStamp(page);
chunk = new Chunk(String.format("Page %d",i));
chunk.setFont(new Font(baseFont));
ColumnText.showTextAligned(stamp.getUnderContent(),
Element.ALIGN_CENTER, new Phrase(chunk),
document.getPageSize().getWidth()/2, 15, 0);
if(i==2){
}
Image watermark_image = Image.getInstance("C:\\Documents and Settings\\Sumit\\Desktop\\ecn_in_pro.png");
watermark_image.setAbsolutePosition(0,0);
under = stamp.getUnderContent();
under.addImage(watermark_image);
stamp.alterContents();
copy.addPage(page);
copy.freeReader(pdfReader);
pdfReader.close();
}
outputStream.flush();
document.close();
outputStream.close();
System.out.println("Merging of Pdfs is done.......");
} catch (Exception e) {
e.printStackTrace();
} finally {
if (document.isOpen())
document.close();
try {
if (outputStream != null)
outputStream.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
}
它仅将所有现有的PDF文件复制到一个新文件中.如何将动态创建的文档添加到PdfCopy进程中?
It only copies all of the existing PDF files into one new file. How do I add the dynamically created document to the PdfCopy process?
If you want to insert an empty page in the PdfCopy process, you should use the addPage() method that takes a Rectangle and a rotation (int) as parameter.
如果要插入包含PdfCopy进程中内容的即时"页面，则需要在内存中创建文档，向该页面添加内容，并以与您相同的方式处理该页面.处理您从磁盘读取的文档.
If you want to insert an "on-the-fly" page that has content in the PdfCopy process, you need to create a document in memory, add content to that page and treat that page the same way as you treat the documents you read from disk.
类似这样的东西:
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Document document = new Document();
PdfWriter.getInstance(document, baos);
document.open();
document.add(new Paragraph("This page is empty on purpose"));
document.close();
PdfReader reader = new PdfReader(boas.toByteArray());
例如，如果要添加封面，则还需要先在内存中创建一个文档，例如列出要合并的所有文档.
If, for instance, you want to add a cover page, you'd also create a document in memory first, for instance listing all the documents that are being merged.