通过Apache PDFBox将pdf与图片互相转换以及合并与拆分pdf_org.apache.pdfbox jar包

Apache PDFBox 库是一个开源、用于操作 PDF 文档的 Java 工具库。PDFBox 允许创建新的 PDF 文档、操作现有文档，以及从文档中提取内容。

获取 Apache PDFBox 下载地址，目前版本 2.0.25，核心 jar 是 pdfbox-2.0.25.jar，其他还有几个 jar 可以根据需要进行导入。

这里 jar包下载与源码学习可以下载全部的 jar 和一些命令行工具，下载 pdfbox-2.0.25-src.zip 源码可以看到文件夹 examples 里面有不少例子进行了示范。
pdf转word
所需jar包下载 无需积分

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pdf合并

package pdfUtity;

import org.apache.pdfbox.multipdf.PDFMergerUtility;

import java.io.File;
import java.io.IOException;
import java.util.Scanner;

//import org.apache.pdfbox.util.PDFMergerUtility;


public class pdfMerge {
    private static String[] getPdfs(String fileAddress) throws IOException {
        File file = new File(fileAddress);
        String[] pdfs;

        if (file.isDirectory()) {
            pdfs = file.list();
            return pdfs;
        } else {
            throw new IOException("输入的路径有问题");
        }
    }

    public static void main(String[] args) throws Exception {
        Scanner in = new Scanner(System.in);
        PDFMergerUtility mergePdf = new PDFMergerUtility();
        System.out.println("请输入要合并的PDF文件所在的文件夹路径");
        String fileAddress = in.nextLine();

        System.out.println("你输入的路径是:" + fileAddress);
        String destinationFileName = "javaweb2020.pdf";

        String[] pdfs = getPdfs(fileAddress);
        for (int i = 0; i < pdfs.length; i++)
            mergePdf.addSource(fileAddress + File.separator + pdfs[i]);
        mergePdf.setDestinationFileName(destinationFileName);
        System.out.println("合并比较费时间,请等待个几分钟吧!");
        mergePdf.mergeDocuments();
        System.out.print("合并完成");
    }

}
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pdf拆分为单页

package pdfUtity;

import org.apache.pdfbox.multipdf.Splitter;
import org.apache.pdfbox.pdmodel.PDDocument;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Iterator;

public class pdfSplitter {

    public static void main(String[] args)throws IOException {

        //把需要拆分的pdf文件加载进来
        File file = new File("d://desktopfile//pdfs//1.pdf");
        PDDocument document = PDDocument.load(file);
        //创建一个拆分器对象
        Splitter splitter = new Splitter();
        //list中存放好被拆分的pdf对象 其中内容是pdf的每一页
        List<PDDocument>Pages = splitter.split(document);
        //创建迭代器对象
        Iterator<PDDocument>iterator = Pages.listIterator();
        //saving splits as individual PDF document
        int i = 1;
        while(iterator.hasNext()) {
            PDDocument pd = iterator.next();
            pd.save("d://desktopfile//pdfPhotos//"+i++ +".pdf");
        }
        System.out.println("pdf拆分成功");
        document.close();
    }
}
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pdf转换为图片

package pdfUtity;/*
 * 读取 pdf，将其中的某一页另存为 png 图片
 */
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.encryption.InvalidPasswordException;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.tools.imageio.ImageIOUtil;

public class PDFSavePNG
{

    public static void main(String[] args)
    {
        try
        {
            // 打开来源 pdf
            PDDocument pdfDocument = PDDocument.load(new File("d://desktopfile//pdfs//1.pdf"));
            PDFRenderer pdfRenderer = new PDFRenderer(pdfDocument);

            for(int pageNumber=0;pageNumber<pdfDocument.getNumberOfPages();pageNumber++){

            // 提取的页码
//            int pageNumber = 0;
            // 以300 dpi 读取存入 BufferedImage 对象
            int dpi = 300;
            BufferedImage buffImage = pdfRenderer.renderImageWithDPI(pageNumber, dpi, ImageType.RGB);
            // 将 BufferedImage 写入到 png
            ImageIOUtil.writeImage(buffImage, "d://desktopfile//pdfPhotos//"+pageNumber+".png", dpi);

            // 关闭文档
            }
            pdfDocument.close();
        }
        catch (InvalidPasswordException e)
        {
            e.printStackTrace();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }

    }

}
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图片转换为pdf

package pdfUtity;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.graphics.image.LosslessFactory;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;

/**
 * @author: Serendipity
 * Date: 2022/3/16 22:40
 * Description:
 */
public class photoToPDF {
    /**
     * 多图片合成pdf的限制后缀
     */
    private static final List IMAGE_SUFFIX = Arrays.asList("jpg", "png", "jpeg");
    /**
     * 多个图片合成一个pdf
     *
     * @param imgFolder 多图片的文件夹路径  例如:"D:\\image\\"
     * @param target    合并的图片路径          "D:\\image\\merge.pdf"
     * @throws IOException
     */
    public static void manyImageToOnePdf(String imgFolder, String target) throws IOException {
        PDDocument doc = new PDDocument();
        //创建一个空的pdf文件
        doc.save(target);

        PDPage page;
        PDImageXObject pdImage;
        PDPageContentStream contents;
        BufferedImage bufferedImage;
        String fileName;
        float w, h;
        String suffix;
        File tempFile;
        int index;

        File folder = new File(imgFolder);
        for (int i = 0; i < folder.listFiles().length; i++) {
            tempFile = folder.listFiles()[i];
            if (!tempFile.isFile()) {
                continue;
            }

            fileName = tempFile.getName();
            index = fileName.lastIndexOf(".");
            if (index == -1) {
                continue;
            }
            //获取文件的后缀
            suffix = fileName.substring(index + 1);
            //如果文件后缀不是图片格式,跳过当前循环
            if (!IMAGE_SUFFIX.contains(suffix)) {
                continue;
            }

            bufferedImage = ImageIO.read(folder.listFiles()[i]);
            //Retrieving the page
            pdImage = LosslessFactory.createFromImage(doc, bufferedImage);
            w = pdImage.getWidth();
            h = pdImage.getHeight();
            page = new PDPage(new PDRectangle(w, h));
            contents = new PDPageContentStream(doc, page);
            contents.drawImage(pdImage, 0, 0, w, h);
            System.out.println("Image inserted");
            contents.close();
            doc.addPage(page);
        }
        //保存pdf
        doc.save(target);
        //关闭pdf
        doc.close();
    }

    public static void main(String[] args) {
        try {
            manyImageToOnePdf("d://图片","photo.pdf");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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