Java如何实现无损Word转PDF

2023-07-02 08:07:29 830人浏览独家记忆

摘要

这篇文章主要介绍“Java如何实现无损Word转pdf”的相关知识，小编通过实际案例向大家展示操作过程，操作方法简单快捷，实用性强，希望这篇“Java如何实现无损Word转PDF”文章能帮助大家解决问题。word转pdf实现思路代码实现主要

这篇文章主要介绍“Java如何实现无损Word转pdf”的相关知识，小编通过实际案例向大家展示操作过程，操作方法简单快捷，实用性强，希望这篇“Java如何实现无损Word转PDF”文章能帮助大家解决问题。

word转pdf实现思路

代码实现主要依赖两个第三方jar包，一个是pdfbox，一个是aspose-words。pdfbox包完全开源免费，aspose-words免费版生成有水印，且生成数量有限制。单纯用pdfbox 实现word转pdf的话，实现非常复杂，且样式和原来样式，保持一致的的比例很低。所以，我先用aspose-words生成了带水印的pdf，再用pdfbox去除aspose-words生成的水印的，最终得到了一个无水印的pdf。

项目远程仓库

aspose-words 这个需要配置单独的仓库地址才能下载，不会配置的可以去官网直接下载jar引入项目代码中。

<repositories>  <repository>   <id>AsposeJavaapi</id>   <name>Aspose Java API</name>   <url>https://repository.aspose.com/repo/</url>  </repository>

Maven项目pom文件依赖

<!-- Https://mvnrepository.com/artifact/org.apache.pdfbox/pdfbox --><dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>3.0.0-RC1</version></dependency><dependency><groupId>com.GitHub.jai-imageio</groupId><artifactId>jai-imageio-jpeg2000</artifactId><version>1.3.0</version></dependency><dependency><groupId>com.aspose</groupId><artifactId>aspose-words</artifactId><version>21.9</version><type>pom</type></dependency>

核心代码实现

import com.aspose.words.Document;import com.aspose.words.SaveFORMat;import org.apache.pdfbox.Loader;import org.apache.pdfbox.contentstream.operator.Operator;import org.apache.pdfbox.cos.COSArray;import org.apache.pdfbox.cos.COSDictionary;import org.apache.pdfbox.cos.COSName;import org.apache.pdfbox.cos.COSString;import org.apache.pdfbox.pdfparser.PDFStreamParser;import org.apache.pdfbox.pdfwriter.ContentStreamWriter;import org.apache.pdfbox.pdmodel.PDDocument;import org.apache.pdfbox.pdmodel.PDPage;import org.apache.pdfbox.pdmodel.PDPageTree;import org.apache.pdfbox.pdmodel.PDResources;import org.apache.pdfbox.pdmodel.common.PDStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.ArrayList;import java.util.Iterator;import java.util.List;public class PDFHelper3 {    public static void main(String[] args) throws IOException {        doc2pdf("C:\\Users\\liuya\\Desktop\\word\\帆软报表帮助文档.docx");    }    //替换pdf文本内容    public static void replaceText(PDPage page, String searchString, String replacement) throws IOException {        PDFStreamParser parser = new PDFStreamParser(page);        List<?> tokens = parser.parse();        for (int j = 0; j < tokens.size(); j++) {            Object next = tokens.get(j);            if (next instanceof Operator) {                Operator op = (Operator) next;                String pstring = "";                int prej = 0;                if (op.getName().equals("Tj")) {                    COSString previous = (COSString) tokens.get(j - 1);                    String string = previous.getString();                    string = string.replaceFirst(searchString, replacement);                    previous.setValue(string.getBytes());                } else if (op.getName().equals("TJ")) {                    COSArray previous = (COSArray) tokens.get(j - 1);                    for (int k = 0; k < previous.size(); k++) {                        Object arrElement = previous.getObject(k);                        if (arrElement instanceof COSString) {                            COSString cosString = (COSString) arrElement;                            String string = cosString.getString();                            if (j == prej) {                                pstring += string;                            } else {                                prej = j;                                pstring = string;                            }                        }                    }                    if (searchString.equals(pstring.trim())) {                        COSString cosString2 = (COSString) previous.getObject(0);                        cosString2.setValue(replacement.getBytes());                        int total = previous.size() - 1;                        for (int k = total; k > 0; k--) {                            previous.remove(k);                        }                    }                }            }        }        List<PDStream> contents = new ArrayList<>();        Iterator<PDStream> streams = page.getContentStreams();        while (streams.hasNext()) {            PDStream updatedStream = streams.next();            OutputStream out = updatedStream.createOutputStream(COSName.FLATE_DECODE);            ContentStreamWriter tokenWriter = new ContentStreamWriter(out);            tokenWriter.writeTokens(tokens);            contents.add(updatedStream);            out.close();        }        page.setContents(contents);    }    //移除图片水印    public static void removeImage(PDPage page, String cosName) {        PDResources resources = page.getResources();        COSDictionary dict1 = resources.getCOSObject();        resources.getXObjectNames().forEach(e -> {            if (resources.isImageXObject(e)) {                COSDictionary dict2 = dict1.getCOSDictionary(COSName.XOBJECT);                if (e.getName().equals(cosName)) {                    dict2.removeItem(e);                }            }            page.setResources(new PDResources(dict1));        });    }    //移除文字水印    public static boolean removeWatermark(File file) {        try {            //通过文件名加载文档            PDDocument document = Loader.loadPDF(file);            PDPageTree pages = document.getPages();            Iterator<PDPage> iter = pages.iterator();            while (iter.hasNext()) {                PDPage page = iter.next();                //去除文字水印                replaceText(page, "Evaluation Only. Created with Aspose.Words. Copyright 2003-2021 Aspose", "");                replaceText(page, "Pty Ltd.", "");                replaceText(page, "Created with an evaluation copy of Aspose.Words. To discover the full", "");                replaceText(page, "versions of our APIs please visit: https://products.aspose.com/words/", "");                replaceText(page, "This document was truncated here because it was created in the Evaluation", "");                //去除图片水印                removeImage(page, "X1");            }            document.removePage(document.getNumberOfPages() - 1);            file.delete();            document.save(file);            document.close();            return true;        } catch (IOException ex) {            ex.printStackTrace();            return false;        }    }    //doc文件转pdf(目前最大支持21页)    public static void doc2pdf(String wordPath) {        long old = System.currentTimeMillis();        try {            //新建一个pdf文档            String pdfPath=wordPath.substring(0,wordPath.lastIndexOf("."))+".pdf";            File file = new File(pdfPath);            FileOutputStream os = new FileOutputStream(file);            //Address是将要被转化的word文档            Document doc = new Document(wordPath);            //全面支持DOC, DOCX, OOXML, RTF html, OpenDocument, PDF, EPUB, XPS, SWF 相互转换            doc.save(os, SaveFormat.PDF);            os.close();            //去除水印            removeWatermark(new File(pdfPath));            //转化用时            long now = System.currentTimeMillis();            System.out.println("Word 转 Pdf 共耗时：" + ((now - old) / 1000.0) + "秒");        } catch (Exception e) {            System.out.println("Word 转 Pdf 失败...");            e.printStackTrace();        }    }}