用Java写一个PDF，Word文件转换工具
前言
前段时间一直使用到word文档转pdf或者pdf转word，寻思着用Java应该是可以实现的，于是花了点时间写了个文件转换工具
源码weloe/FileConversion (github.com)
主要功能就是word和pdf的文件转换，如下
- pdf 转 word
- pdf 转 图片
- word 转 图片
- word 转 html
- word 转 pdf
实现方法
主要使用了pdfbox Apache PDFBox | A Java PDF Library以及spire.doc Free Spire.Doc for Java | 100% 免费 Java Word 组件 (e-iceblue.cn)两个工具包
pom.xml
<repositories>
<repository>
<id>com.e-iceblue</id>
<url>http://repo.e-iceblue.cn/repository/maven-public/</url>
</repository>
</repositories>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.4</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>e-iceblue</groupId>
<artifactId>spire.doc.free</artifactId>
<version>3.9.0</version>
</dependency>
</dependencies>
策略接口
public interface FileConversion {
boolean isSupport(String s);
String convert(String pathName,String dirAndFileName) throws Exception;
}
PDF转图片实现
public class PDF2Image implements FileConversion{
private String suffix = ".jpg";
public static final int DEFAULT_DPI = 150;
@Override
public boolean isSupport(String s) {
return "pdf2image".equals(s);
}
@Override
public String convert(String pathName,String dirAndFileName) throws Exception {
String outPath = dirAndFileName + suffix;
if(Files.exists(Paths.get(outPath))){
throw new RuntimeException(outPath+" 文件已存在");
}
pdf2multiImage(pathName,outPath,DEFAULT_DPI);
return outPath;
}
/**
* pdf转图片
* 多页PDF会每页转换为一张图片，下面会有多页组合成一页的方法
*
* @param pdfFile pdf文件路径
* @param outPath 图片输出路径
* @param dpi 相当于图片的分辨率，值越大越清晰，但是转换时间变长
*/
public void pdf2multiImage(String pdfFile, String outPath, int dpi) {
if (dpi <= 0) {
// 如果没有设置DPI，默认设置为150
dpi = DEFAULT_DPI;
}
try (PDDocument pdf = PDDocument.load(new FileInputStream(pdfFile))) {
int actSize = pdf.getNumberOfPages();
List<BufferedImage> picList = new ArrayList<>();
for (int i = 0; i < actSize; i++) {
BufferedImage image = new PDFRenderer(pdf).renderImageWithDPI(i, dpi, ImageType.RGB);
picList.add(image);
}
// 组合图片
ImageUtil.yPic(picList, outPath);
} catch (IOException e) {
e.printStackTrace();
}
}
}
PDF转word实现
public class PDF2Word implements FileConversion {
private String suffix = ".doc";
@Override
public boolean isSupport(String s) {
return "pdf2word".equals(s);
}
/**
*
* @param pathName
* @throws IOException
*/
@Override
public String convert(String pathName,String dirAndFileName) throws Exception {
String outPath = dirAndFileName + suffix;
if(Files.exists(Paths.get(outPath))){
throw new RuntimeException(outPath+" 文件已存在");
}
pdf2word(pathName, outPath);
return outPath;
}
private void pdf2word(String pathName, String outPath) throws IOException {
PDDocument doc = PDDocument.load(new File(pathName));
int pagenumber = doc.getNumberOfPages();
// 创建文件
createFile(Paths.get(outPath));
FileOutputStream fos = new FileOutputStream(outPath);
Writer writer = new OutputStreamWriter(fos, "UTF-8");
PDFTextStripper stripper = new PDFTextStripper();
stripper.setSortByPosition(true);//排序
stripper.setStartPage(1);//设置转换的开始页
stripper.setEndPage(pagenumber);//设置转换的结束页
stripper.writeText(doc, writer);
writer.close();
doc.close();
}
}
word转html
public class Word2HTML implements FileConversion{
private String suffix = ".html";
@Override
public boolean isSupport(String s) {
return "word2html".equals(s);
}
@Override
public String convert(String pathName, String dirAndFileName) {
String outPath = dirAndFileName + suffix;
if(Files.exists(Paths.get(outPath))){
throw new RuntimeException(outPath+" 文件已存在");
}
Document doc = new Document();
doc.loadFromFile(pathName);
doc.saveToFile(outPath, FileFormat.Html);
doc.dispose();
return outPath;
}
}
word转图片
public class Word2Image implements FileConversion{
private String suffix = ".jpg";
@Override
public boolean isSupport(String s) {
return "word2image".equals(s);
}
@Override
public String convert(String pathName, String dirAndFileName) throws Exception {
String outPath = dirAndFileName + suffix;
if(Files.exists(Paths.get(outPath))){
throw new RuntimeException(outPath+" 文件已存在");
}
Document doc = new Document();
//加载文件
doc.loadFromFile(pathName);
//上传文档页数，也是最后要生成的图片数
Integer pageCount = doc.getPageCount();
// 参数第一个和第三个都写死 第二个参数就是生成图片数
BufferedImage[] image = doc.saveToImages(0, pageCount, ImageType.Bitmap);
// 组合图片
List<BufferedImage> imageList = Arrays.asList(image);
ImageUtil.yPic(imageList, outPath);
return outPath;
}
}
word转pdf
public class Word2PDF implements FileConversion{
private String suffix = ".pdf";
@Override
public boolean isSupport(String s) {
return "word2pdf".equals(s);
}
@Override
public String convert(String pathName, String dirAndFileName) throws Exception {
String outPath = dirAndFileName + suffix;
if(Files.exists(Paths.get(outPath))){
throw new RuntimeException(outPath+" 文件已存在");
}
//加载word
Document document = new Document();
document.loadFromFile(pathName, FileFormat.Docx);
//保存结果文件
document.saveToFile(outPath, FileFormat.PDF);
document.close();
return outPath;
}
}
使用
输入转换方法，文件路径，输出路径(输出路径如果输入'null'则为文件同目录下同名不同后缀文件)
转换方法可选项：
- pdf2word
- pdf2image
- word2html
- word2image
- word2pdf
例如输入:
pdf2word D:\test\testpdf.pdf null
控制台输出：
转换方法: pdf2word 文件: D:\test\testFile.pdf
转换成功！文件路径: D:\test\testFile.doc
