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package pdfTransform;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.*;

public class PdfTransform {

    //鏈�缁坧df淇濆瓨鐨勮矾寰�
    public static String final_path = "C:\\pdf\\outPdf2.pdf";
    
    /*
     *@desc:鍒涘缓涓�涓柊鐨刾df,浼犲叆鍙傛暟(闇�瑕佹墦鍗扮殑鏃df鎶ュ憡),鍏堢瓫閫夋棫pdf鎶ュ憡鐨勫鏁伴〉鍔犲叆鏂皃df,鍐嶇瓫閫夊伓鏁伴〉鍔犲叆鏂皃df
     *@parm:myReader:PdfReader,old pdf
     *@return out:FileOutputStream,a new pdf 
     */
    
    public static FileOutputStream pdfSolve(PdfReader myReader) {
        Document document = new Document();
        PdfWriter writer;
        FileOutputStream out = null;
        try {
            out = new FileOutputStream(final_path);
            writer = PdfWriter.getInstance(document, out);
            document.open();
            PdfContentByte contentByte = writer.getDirectContent();
            int currentPage = 1;
            //鍔犲叆濂囨暟椤靛埌鏂皃df
            while(currentPage <= myReader.getNumberOfPages()) {
                document.newPage();
                if(currentPage % 2 != 0) {
                    PdfImportedPage page = writer.getImportedPage(myReader, currentPage);
                    contentByte.addTemplate(page, 0,0);
                }
                currentPage++;
            }
            currentPage = 1;
            //鍐嶅姞鍏ュ伓鏁伴〉鍒版柊pdf
            while(currentPage <= myReader.getNumberOfPages()) {
                document.newPage();
                if(currentPage % 2 == 0) {
                    PdfImportedPage page = writer.getImportedPage(myReader, currentPage);
                    contentByte.addTemplate(page, 0,0);
                }
                currentPage++;
            }
            document.close();
            out.flush();
            out.close();
        } catch (Exception e) {
            // TODO: handle exception
             e.printStackTrace();
        }
        return out;
    }
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        InputStream myStream = null;
        PdfReader myReader;
        try {
            myStream = new FileInputStream("C:\\pdf\\inputPdf2.pdf"); //鍘熸棫pdf鎶ュ憡鐨勮矾寰�
            myReader = new PdfReader(myStream);
            PdfTransform.pdfSolve(myReader);
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }

}

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