IO流之copy PDF文件

package com.io;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfStream;
import com.itextpdf.text.pdf.PdfWriter;

public class CopyFilePDF {

	public static void main(String[] args) {
		
		FileInputStream fileInputStream = null;
		ByteArrayOutputStream byteArrayOutputStream = null;
		FileOutputStream fileOutputStream = null;
		
		try {
			fileInputStream = new FileInputStream(new File("D:\\aa.pdf"));
			fileOutputStream = new FileOutputStream(new File("D:\\bb.pdf"));
			byteArrayOutputStream = new ByteArrayOutputStream();
			
			byte[] bytes = new byte[1024];
			
			int len;
			
			while ((len = fileInputStream.read(bytes)) != -1) {
				byteArrayOutputStream.write(bytes, 0, len);
			}
			
			byteArrayOutputStream.flush();
			
			Document document = new Document();
			PdfStream pdfStream = new PdfStream(byteArrayOutputStream.toByteArray());
			PdfWriter pdfWriter = PdfWriter.getInstance(document, fileOutputStream);
			pdfStream.toPdf(pdfWriter, fileOutputStream);
			pdfWriter.flush();
			
		} catch (IOException e) {
			e.printStackTrace();
		} catch (DocumentException e) {
			e.printStackTrace();
		} finally {
			try {
				if (null != fileOutputStream) {
					fileOutputStream.close();
				}
				if (null != byteArrayOutputStream) {
					byteArrayOutputStream.close();
				}
				if (null != fileInputStream) {
					fileInputStream.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

}

需要导入的jar包：
链接：https://pan.baidu.com/s/1tW5tiIQCWtoaJapMeJ1nZg
提取码：vnhv