在Java中将多页TIFF转换为Base64字符串

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import org.apache.commons.io.IOUtils;
import org.apache.commons.codec.binary.Base64;

public class TiffToBase64Converter {

    public static void main(String[] args) {
        String tiffFilePath = "path/to/tiff/file.tif";

        try {
            // 读取TIFF文件
            File tiffFile = new File(tiffFilePath);
            FileInputStream fis = new FileInputStream(tiffFile);
            ImageInputStream imageInputStream = ImageIO.createImageInputStream(fis);

            // 获取TIFF的ImageReader
            Iterator<ImageReader> imageReaders = ImageIO.getImageReaders(imageInputStream);
            ImageReader reader = null;
            while (imageReaders.hasNext()) {
                reader = imageReaders.next();
                if (reader.getFormatName().equalsIgnoreCase("TIFF")) {
                    break;
                }
            }

            if (reader == null) {
                throw new IOException("No TIFF ImageReader found");
            }

            // 设置TIFF的输入流
            reader.setInput(imageInputStream);

            int numPages = reader.getNumImages(true);

            // 遍历每一页
            for (int i = 0; i < numPages; i++) {
                // 将当前页转换为BufferedImage
                BufferedImage image = reader.read(i);

                // 将BufferedImage转换为Base64字符串
                String base64String = convertToBase64(image);

                // 输出Base64字符串
                System.out.println("Page " + (i+1) + ": " + base64String);
            }

            // 关闭输入流
            fis.close();
            imageInputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static String convertToBase64(BufferedImage image) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write(image, "TIFF", baos);

        // 将字节数组转换为Base64字符串
        byte[] imageBytes = baos.toByteArray();
        String base64String = Base64.encodeBase64String(imageBytes);

        baos.close();

        return base64String;
    }
}