Java实现无损Word转PDF的示例代码
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。
<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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