處理PDF

import
 java.io.FileOutputStream;
import
 java.io.IOException;
import
 java.util.ArrayList;

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
 pdfOperate
{
    private
 static
 final
 int
 N = 3
;

    public
 static
 void
 main(String[] args)
    {
        String[] files = {"C://a.pdf"
, "C://b.pdf"
};
        String savepath = "C://temp.pdf"
;
        mergePdfFiles(files, savepath);

        partitionPdfFile("C://a.pdf"
);
    }

    public
 static
 void
 mergePdfFiles(String[] files, String savepath)
    {
        try
        {
            Document document = new
 Document(new
 PdfReader(files[0
]).getPageSize(1
));

            PdfCopy copy = new
 PdfCopy(document, new
 FileOutputStream(savepath));

            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);
                }
            }

            document.close();

        } catch
 (IOException e) {
            e.printStackTrace();
        } catch
(DocumentException e) {
            e.printStackTrace();
        }
    }

    public
 static
 void
 partitionPdfFile(String filepath)
    {
        Document document = null
;
        PdfCopy copy = null
;

        try
        {
            PdfReader reader = new
 PdfReader(filepath);

            int
 n = reader.getNumberOfPages();

            if
(n < N)
            {
                System.out.println("The document does not have "
 + N + " pages to partition !"
);
                return
;
            }

            int
 size = n/N;
            String staticpath = filepath.substring(0
, filepath.lastIndexOf("//"
)+1
);
            String savepath = null
;
            ArrayList<String> savepaths = new
 ArrayList<String>();
            for
(int
 i=1
; i<=N; i++)
            {
                if
(i < 10
)
                {
                    savepath = filepath.substring(filepath.lastIndexOf("//"
)+1
, filepath.length()-4
);
                    savepath = staticpath + savepath + "0"
 + i + ".pdf"
;
                    savepaths.add(savepath);
                }
                else
                {
                    savepath = filepath.substring(filepath.lastIndexOf("//"
)+1
, filepath.length()-4
);
                    savepath = staticpath + savepath + i + ".pdf"
;
                    savepaths.add(savepath);
                }
            }

            for
(int
 i=0
; i<N-1
; i++)
            {
                document = new
 Document(reader.getPageSize(1
));
                copy = new
 PdfCopy(document, new
 FileOutputStream(savepaths.get(i)));
                document.open();
                for
(int
 j=size*i+1
; j<=size*(i+1
); j++)
                {
                    document.newPage();
                    PdfImportedPage page = copy.getImportedPage(reader, j);
                    copy.addPage(page);
                }
                document.close();
            }


            document = new
 Document(reader.getPageSize(1
));
            copy = new
 PdfCopy(document, new
 FileOutputStream(savepaths.get(N-1
)));
            document.open();
            for
(int
 j=size*(N-1
)+1
; j<=n; j++)
            {
                document.newPage();
                PdfImportedPage page = copy.getImportedPage(reader, j);
                copy.addPage(page);
            }
            document.close();

        } catch
 (IOException e) {
            e.printStackTrace();
        } catch
(DocumentException e) {
            e.printStackTrace();
        }
    }
}