iText5，合并PDF，

	public static boolean mergePdfFiles(String[] files, String newfile) {
		boolean retValue = false;
		Document document = null;
		PdfReader reader = null;
		PdfImportedPage page = null;
		PdfCopy copy = null;
		List readerList = new ArrayList();// 记录合并PDF集合
		List pageList = new ArrayList();// 记录合并PDF集合
		List copyList = new ArrayList();// 记录合并PDF集合
		OutputStream newFileStream = null;
		try {
			newFileStream = new FileOutputStream(newfile);

			reader = new PdfReader(files[0]);
			document = new Document(reader.getPageSize(1));
			reader.close();
			reader = null;

			copy = new PdfCopy(document, newFileStream);
			document.open();
			for (int i = 0; i < files.length; i++) {
				reader = new PdfReader(files[i]);
				int n = reader.getNumberOfPages();
				for (int j = 1; j <= n; j++) {
					document.newPage();
					page = copy.getImportedPage(reader, j);
					pageList.add(page);
					copy.addPage(page);
					copyList.add(copy);
				}
				readerList.add(reader);
			}
			retValue = true;
		} catch (Exception e) {
			e.printStackTrace();
			RecordException.recordPrintException(e, null);
		} finally {
			for (int i = 0; i < copyList.size(); i++) {
				copy = copyList.get(i);
				copy.close();
			}
			for (int i = 0; i < pageList.size(); i++) {
				page = pageList.get(i);
				page.closePath();
			}
			for (int i = 0; i < readerList.size(); i++) {
				reader = readerList.get(i);
				reader.close();
			}
			document.close();
			copy = null;
			page = null;
			reader = null;
			document = null;

			copyList.clear();
			pageList.clear();
			readerList.clear();
			copyList = null;
			pageList = null;
			readerList = null;
			try {
				if (null!=newFileStream) {
					newFileStream.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			newFileStream = null;
			File file = null;
			for (int i = 0; i < files.length; i++) {
				file = new File(files[i]);
				file.delete();
				file = null;
			}
		}
		return retValue;
	}