Java实现无损Word转PDF的示例代码

目录前言word转pdf实现思路项目远程仓库Maven项目pom文件依赖核心代码实现结果分析

前言

本来想写word转pdf和pdf转word的代码呢，没想到word转pdf就写了很多很多行代码才实现，为了方便大家消化理解，先写了word转pdf方法实现作为一篇文章。

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。

AsposejavaAPI

Aspose Java API

https://repository.aspose.com/repo/

Maven项目pom文件依赖

org.apache.pdfbox

pdfbox

3.0.0-RC1

com.github.jai-imageio

jai-imageio-jpeg2000

1.3.0

com.aspose

aspose-words

21.9

pom

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;

http://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 contents = new ArrayList<>();

Iterator 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 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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