用java五分钟 pdf转word 轻松搞定

最近家人有个pdf 文档需要转成word ，我觉得很轻松就在网上搜索工具，竟然没有找到好用的工具，有几个像样的竟然需要银子？？

pdf转换这么难吗？为什么需要花钱才能解决？强大的java,好用的apache 工具系列解决不了么 ？所以决定研究一下。

首先找到了apache pdf 解析的依赖包：

<dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>2.0.4</version>
        </dependency>
        <dependency>
            <groupId>net.coobird</groupId>
            <artifactId>thumbnailator</artifactId>
            <version>0.4.8</version>
        </dependency>

另外一个是图片处理的包。

由于pdf 中包含图片和文字，所以我提取图片和文字添加到word 中就好，添加POI依赖。

<dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.9</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.9</version>
        </dependency>

然后贴一下代码：

public class Pdf2word {
    public static void main(String[] args) throws InvalidFormatException {

        try {
            String pdfFileName = "H:\\xuweichao.pdf";
            PDDocument pdf = PDDocument.load(new File(pdfFileName));
            int pageNumber = pdf.getNumberOfPages();

            String docFileName = pdfFileName.substring(0, pdfFileName.lastIndexOf(".")) + ".doc";

            File file = new File(docFileName);
            if (!file.exists()) {
                file.createNewFile();
            }
            CustomXWPFDocument document = new CustomXWPFDocument();
            FileOutputStream fos = new FileOutputStream(docFileName);

            //提取每一页的图片和文字，添加到 word 中
            for (int i = 0; i < pageNumber; i++) {

                PDPage page = pdf.getPage(i);
                PDResources resources = page.getResources();

                Iterable<COSName> names = resources.getXObjectNames();
                Iterator<COSName> iterator = names.iterator();
                while (iterator.hasNext()) {
                    COSName cosName = iterator.next();

                    if (resources.isImageXObject(cosName)) {
                        PDImageXObject imageXObject = (PDImageXObject) resources.getXObject(cosName);
                        File outImgFile = new File("H:\\img\\" + System.currentTimeMillis() + ".jpg");
                        Thumbnails.of(imageXObject.getImage()).scale(0.9).rotate(0).toFile(outImgFile);


                        BufferedImage bufferedImage = ImageIO.read(outImgFile);
                        int width = bufferedImage.getWidth();
                        int height = bufferedImage.getHeight();
                        if (width > 600) {
                            double ratio = Math.round((double) width / 550.0);
                            System.out.println("缩放比ratio："+ratio);
                            width = (int) (width / ratio);
                            height = (int) (height / ratio);

                        }

                        System.out.println("width: " + width + ",  height: " + height);
                        FileInputStream in = new FileInputStream(outImgFile);
                        byte[] ba = new byte[in.available()];
                        in.read(ba);
                        ByteArrayInputStream byteInputStream = new ByteArrayInputStream(ba);

                        XWPFParagraph picture = document.createParagraph();
                        //添加图片
                        document.addPictureData(byteInputStream, CustomXWPFDocument.PICTURE_TYPE_JPEG);
                        //图片大小、位置
                        document.createPicture(document.getAllPictures().size() - 1, width, height, picture);

                    }
                }


                PDFTextStripper stripper = new PDFTextStripper();
                stripper.setSortByPosition(true);
                stripper.setStartPage(i);
                stripper.setEndPage(i);
                //当前页中的文字
                String text = stripper.getText(pdf);


                XWPFParagraph textParagraph = document.createParagraph();
                XWPFRun textRun = textParagraph.createRun();
                textRun.setText(text);
                textRun.setFontFamily("仿宋");
                textRun.setFontSize(11);
                //换行
                textParagraph.setWordWrap(true);
            }
            document.write(fos);
            fos.close();
            pdf.close();
            System.out.println("pdf转换解析结束！！----");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

自定义文档类：

public class CustomXWPFDocument extends XWPFDocument {
    public CustomXWPFDocument(InputStream in) throws IOException {
        super(in);
    }

    public CustomXWPFDocument() {
        super();
    }

    public CustomXWPFDocument(OPCPackage pkg) throws IOException {
        super(pkg);
    }

    /**
     * @param id
     * @param width
     *            宽
     * @param height
     *            高
     * @param paragraph
     *            段落
     */
    public void createPicture(int id, int width, int height,
                              XWPFParagraph paragraph) {
        final int EMU = 9525;
        width *= EMU;
        height *= EMU;
        String blipId = getAllPictures().get(id).getPackageRelationship()
                .getId();
        CTInline inline = paragraph.createRun().getCTR().addNewDrawing()
                .addNewInline();
        String picXml = ""
                + "<a:graphic xmlns:a=\"http://schemas.openxmlformats.org/drawingml/2006/main\">"
                + "   <a:graphicData uri=\"http://schemas.openxmlformats.org/drawingml/2006/picture\">"
                + "      <pic:pic xmlns:pic=\"http://schemas.openxmlformats.org/drawingml/2006/picture\">"
                + "         <pic:nvPicPr>" + "            <pic:cNvPr id=\""
                + id
                + "\" name=\"Generated\"/>"
                + "            <pic:cNvPicPr/>"
                + "         </pic:nvPicPr>"
                + "         <pic:blipFill>"
                + "            <a:blip r:embed=\""
                + blipId
                + "\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\"/>"
                + "            <a:stretch>"
                + "               <a:fillRect/>"
                + "            </a:stretch>"
                + "         </pic:blipFill>"
                + "         <pic:spPr>"
                + "            <a:xfrm>"
                + "               <a:off x=\"0\" y=\"0\"/>"
                + "               <a:ext cx=\""
                + width
                + "\" cy=\""
                + height
                + "\"/>"
                + "            </a:xfrm>"
                + "            <a:prstGeom prst=\"rect\">"
                + "               <a:avLst/>"
                + "            </a:prstGeom>"
                + "         </pic:spPr>"
                + "      </pic:pic>"
                + "   </a:graphicData>" + "</a:graphic>";

        inline.addNewGraphic().addNewGraphicData();
        XmlToken xmlToken = null;
        try {
            xmlToken = XmlToken.Factory.parse(picXml);
        } catch (XmlException xe) {
            xe.printStackTrace();
        }
        inline.set(xmlToken);

        inline.setDistT(0);
        inline.setDistB(0);
        inline.setDistL(0);
        inline.setDistR(0);

        CTPositiveSize2D extent = inline.addNewExtent();
        extent.setCx(width);
        extent.setCy(height);

        CTNonVisualDrawingProps docPr = inline.addNewDocPr();
        docPr.setId(id);
        docPr.setName("图片名称");
        docPr.setDescr("描述信息");
    }
}

程序就这么简单，遍历文件每一页抽取到pdf 中的图片和文字，文字样式问题暂未解决，但是生成的word 文件对大图片做了比例缩小，对于排版简单的pdf 文件效果还是不错的。