用itext合并多个pdf文件【转】【补】

java代码

package c;

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

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfCopy;
import com.itextpdf.text.pdf.PdfImportedPage;
import com.itextpdf.text.pdf.PdfReader;

public class PdfOperate {
    static String savepath = "D:/temp/pdftest/all.pdf";

    public static void main(String[] args) {
        System.out.println("start " + new Date());
        List<String> fileList = getFiles();
        morePdfTopdf(fileList, savepath);
    }

    public static List<String> getFiles() {
        List<String> fileList = new ArrayList<String>();
        for (int i = 0; i < 3; i++) {
            fileList.add("D:/temp/pdftest/m (" + i + ").pdf");
        }
        return fileList;
    }

    public static void morePdfTopdf(List<String> fileList, String savepath) {
        Document document = null;
        try {
            document = new Document(new PdfReader(fileList.get(0)).getPageSize(1));
            PdfCopy copy = new PdfCopy(document, new FileOutputStream(savepath));
            document.open();
            for (int i = 0; i < fileList.size(); i++) {
                PdfReader reader = new PdfReader(fileList.get(i));
                int n = reader.getNumberOfPages();// 获得总页码
                for (int j = 1; j <= n; j++) {
                    document.newPage();
                    PdfImportedPage page = copy.getImportedPage(reader, j);// 从当前Pdf,获取第j页
                    copy.addPage(page);
                }
                System.out.println(i);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (DocumentException e) {
            e.printStackTrace();
        } finally {
            if (document != null) {
                document.close();
            }
            System.out.println("finish " + new Date());
        }
    }
}

jar包

本代码用了比较新版的itextpdf-5.5.13.jar http://mvnrepository.com/artifact/com.itextpdf/itextpdf/5.5.13

原参考链接好像用的是2.1.7旧版的.

效果

性能

在合并200个pdf ,  每个600Kb, 耗时大约4秒左右,性能极佳.

部分参考自

IText实现多个pdf转成一个pdf--http://wangming2012.iteye.com/blog/1529912