有关文件转pdf的代码示例

<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>2.0.24</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>4.1.2</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>4.1.2</version>
</dependency>
<dependency>
    <groupId>fr.opensagres.xdocreport</groupId>
    <artifactId>org.apache.poi.xwpf.converter.pdf</artifactId>
    <version>2.0.2</version>
</dependency>

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.tools.PDFToImage;
import org.apache.pdfbox.tools.imageio.ImageIOUtil;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.converter.PDFConverter;
import org.apache.poi.hwpf.usermodel.Range;
import org.apache.poi.xwpf.converter.pdf.PdfConverter;
import org.apache.poi.xwpf.converter.pdf.PdfOptions;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
public class FileToPdfConverter {
    public static void main(String[] args) {
        try {
            // 读入需要转换的文件
            File inputFile = new File("input.doc");
            FileInputStream inStream = new FileInputStream(inputFile);
            // 创建pdf输出文件
            File outputFile = new File("output.pdf");
            FileOutputStream outStream = new FileOutputStream(outputFile);
            // 创建pdf文档
            PDDocument document = new PDDocument();
            // 根据文件类型选择转换方法
            if (inputFile.getName().endsWith(".doc")) {
                // 将doc文件转换为pdf文件
                HWPFDocument doc = new HWPFDocument(inStream);
                Range range = doc.getRange();
                PdfConverter.getInstance().convert(range, document);
            } else if (inputFile.getName().endsWith(".docx")) {
                // 将docx文件转换为pdf文件
                XWPFDocument doc = new XWPFDocument(inStream);
                PdfOptions options = PdfOptions.create();
                PdfConverter.getInstance().convert(doc, document, options);
            } else if (inputFile.getName().endsWith(".txt")) {
                // 将txt文件转换为pdf文件
                PDPage page = new PDPage(PDRectangle.A4);
                document.addPage(page);
                PDPageContentStream contentStream = new PDPageContentStream(document, page);
                FileInputStream inputStream = new FileInputStream(inputFile);
                int data = inputStream.read();
                while(data != -1) {
                    contentStream.beginText();
                    contentStream.showText(String.valueOf((char)data));
                    contentStream.endText();
                    contentStream.newLineAtOffset(0, -12);
                    data = inputStream.read();
                }
                inputStream.close();
                contentStream.close();
            } else if (inputFile.getName().endsWith(".jpg") || inputFile.getName().endsWith(".jpeg") || inputFile.getName().endsWith(".png")) {
                // 将图片文件转换为pdf文件
                PDPage page = new PDPage();
                document.addPage(page);
                PDFRenderer renderer = new PDFRenderer(document);
                PDFToImage pdfToImage = new PDFToImage();
                pdfToImage.setImageType("png");
                pdfToImage.setOutputPrefix("tmp");
                pdfToImage.setPdfFile(inputFile.getAbsolutePath());
                pdfToImage.startConversion(renderer, 1, 1);
                File tmpFile = new File("tmp-1.png");
                ImageIOUtil.writeImage(renderer.renderImage(0), "tmp-1.png", 300);
                PDPageContentStream contentStream = new PDPageContentStream(document, page);
                contentStream.drawImage(PDImageXObject.createFromFile(tmpFile.getAbsolutePath(), document), 0, 0, PDRectangle.A4.getWidth(), PDRectangle.A4.getHeight());
                contentStream.close();
                tmpFile.delete();
            } else {
                System.out.println("不支持的文件类型");
                return;
            }
            // 保存pdf文件并关闭输入输出流
            document.save(outStream);
            document.close();
            inStream.close();
            outStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}