자바 통합 PDF,itext.jar

import java.io.FileOutputStream;
import java.io.IOException;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.pdf.PdfCopy;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;

public class MergeFile {
	public static void main(String[] args) {
		String[] files = { "e:\\1.pdf", "e:\\2.pdf", "e:\\3.pdf" };
		String savepath = "e:\\temp.pdf";
		mergePdfFiles(files, savepath);
	} /*
		 * *   pdf   * * @param files        (     { "e:\\1.pdf", "e:\\2.pdf" ,
		 * "e:\\3.pdf"}) * @param newfile
		 *               e:\\temp.pdf,                * @return boolean
		 *       true,     false
		 */

	public static boolean mergePdfFiles(String[] files, String newfile) {
		boolean retValue = false;
		Document document = null;
		try {
			document = new Document(new PdfReader(files[0]).getPageSize(1));
			PdfCopy copy = new PdfCopy(document, new FileOutputStream(newfile));
			document.open();
			for (int i = 0; i < files.length; i++) {
				PdfReader reader = new PdfReader(files[i]);
				int n = reader.getNumberOfPages();
				for (int j = 1; j <= n; j++) {
					document.newPage();
					PdfImportedPage page = copy.getImportedPage(reader, j);
					copy.addPage(page);
				}
			}
			retValue = true;
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			document.close();
		}
		return retValue;
	}
}