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這篇文章主要介紹“Java如何實現無損Word轉PDF”的相關知識，小編通過實際案例向大家展示操作過程，操作方法簡單快捷，實用性強，希望這篇“Java如何實現無損Word轉PDF”文章能幫助大家解決問題。
代碼實現主要依賴兩個第三方jar包，一個是pdfbox，一個是aspose-words。pdfbox包完全開源免費，aspose-words免費版生成有水印，且生成數量有限制。單純用pdfbox 實現word轉pdf的話，實現非常復雜，且樣式和原來樣式，保持一致的的比例很低。所以，我先用aspose-words生成了帶水印的pdf，再用pdfbox去除aspose-words生成的水印的，最終得到了一個無水印的pdf。
aspose-words 這個需要配置單獨的倉庫地址才能下載，不會配置的可以去官網直接下載jar引入項目代碼中。
<repositories> <repository> <id>AsposeJavaAPI</id> <name>Aspose Java API</name> <url>https://repository.aspose.com/repo/</url> </repository>
<!-- 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>
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\\帆軟報表幫助文檔.docx");
}
//替換pdf文本內容
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);
}
//移除圖片水印
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 {
//通過文件名加載文檔
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", "");
//去除圖片水印
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文件轉pdf(目前最大支持21頁)
public static void doc2pdf(String wordPath) {
long old = System.currentTimeMillis();
try {
//新建一個pdf文檔
String pdfPath=wordPath.substring(0,wordPath.lastIndexOf("."))+".pdf";
File file = new File(pdfPath);
FileOutputStream os = new FileOutputStream(file);
//Address是將要被轉化的word文檔
Document doc = new Document(wordPath);
//全面支持DOC, DOCX, OOXML, RTF HTML, OpenDocument, PDF, EPUB, XPS, SWF 相互轉換
doc.save(os, SaveFormat.PDF);
os.close();
//去除水印
removeWatermark(new File(pdfPath));
//轉化用時
long now = System.currentTimeMillis();
System.out.println("Word 轉 Pdf 共耗時：" + ((now - old) / 1000.0) + "秒");
} catch (Exception e) {
System.out.println("Word 轉 Pdf 失敗...");
e.printStackTrace();
}
}
}以一個帶文字和圖片，工21頁的doc文件為例，word轉pdf花費時長4.398秒
原word樣式
轉化后pdf效果圖
通過對比，word原來的樣式和轉換pdf文件后的樣式基本沒有變化。
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