Java如何实现无损Word转PDF
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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(); } }}结果分析
以一个带文字和图片，工21页的doc文件为例，word转pdf花费时长4.398秒
原word样式
转化后pdf效果图
通过对比，word原来的样式和转换pdf文件后的样式基本没有变化。
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