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);

    } /*

         * * 合並pdf文件 * * @param files 要合並文件數組(絕對路徑如{ "e:\\1.pdf", "e:\\2.pdf" ,

         * "e:\\3.pdf"}) * @param newfile

         * 合並後新產生的文件絕對路徑如e:\\temp.pdf,請自己刪除用過後不再用的文件請 * @return boolean

         * 產生成功返回true, 否則返回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;

    }

}