在Java中PDF与TIFF格式互转的实现方案

// 核心依赖（Maven）
<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>3.0.0</version>
</dependency>
<dependency>
    <groupId>javax.media.jai</groupId>
    <artifactId>jai-core</artifactId>
    <version>1.1.3</version>
</dependency>

// 关键代码实现
public class Pdf2TiffConverter {
    public static void convert(String pdfPath, String tiffPath) throws IOException {
        PDDocument document = PDDocument.load(new File(pdfPath));
        PDFRenderer renderer = new PDFRenderer(document);
        
        TIFFEncodeParam params = new TIFFEncodeParam();
        params.setCompression(TIFFEncodeParam.COMPRESSION_GROUP4);
        params.setLittleEndian(false);
        
        ImageEncoder encoder = new TIFFImageEncoder(new File(tiffPath), params);
        for (int i = 0; i < document.getNumberOfPages(); i++) {
            BufferedImage pageImage = renderer.renderImageWithDPI(i, 300);
            encoder.encode(pageImage);
        }
        document.close();
    }
}

// 核心依赖（Maven）
<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.13.3</version>
</dependency>

// 关键代码实现
public class Tiff2PdfConverter {
    public static void convert(String tiffPath, String pdfPath) throws IOException {
        RandomAccessFileOrArray ra = new RandomAccessFileOrArray(tiffPath);
        int pageCount = TiffImage.getNumberOfPages(ra);
        
        Document document = new Document();
        PdfWriter.getInstance(document, new FileOutputStream(pdfPath));
        document.open();
        
        for (int i = 1; i <= pageCount; i++) {
            Image image = TiffImage.getTiffImage(ra, i);
            image.scaleToFit(document.getPageSize().getWidth(), document.getPageSize().getHeight());
            document.add(image);
        }
        document.close();
    }
}

// Maven依赖配置
<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>
<dependency>
    <groupId>com.github.Cloudmersive</groupId>
    <artifactId>Cloudmersive.APIClient.Java</artifactId>
    <version>v4.25</version>
</dependency>

// API调用示例
public class PdfToTiffApi {
    public static void main(String[] args) {
        ApiClient client = Configuration.getDefaultApiClient();
        client.setApiKey("YOUR_API_KEY");
        
        ConvertApi apiInstance = new ConvertApi();
        File inputFile = new File("contract.pdf");
        
        try {
            byte[] result = apiInstance.convertToTiff(inputFile);
            Files.write(Paths.get("output.tiff"), result);
            System.out.println("转换成功！");
        } catch (ApiException | IOException e) {
            e.printStackTrace();
        }
    }
}

// Maven依赖同上
public class TiffToPdfApi {
    public static void main(String[] args) {
        ApiClient client = Configuration.getDefaultApiClient();
        client.setApiKey("YOUR_API_KEY");
        
        ConvertDocumentApi apiInstance = new ConvertDocumentApi();
        File inputFile = new File("scan.tiff");
        
        try {
            byte[] result = apiInstance.convertDocumentAutodetectToPdf(inputFile);
            Files.write(Paths.get("output.pdf"), result);
            System.out.println("转换完成！");
        } catch (ApiException | IOException e) {
            e.printStackTrace();
        }
    }
}

try {
    // 转换操作
} catch (FileNotFoundException e) {
    logger.error("输入文件不存在");
} catch (IOException e) {
    logger.error("I/O操作异常", e);
} catch (ApiException e) {
    logger.error("API调用失败: {}", e.getResponseBody());
}