java中识别pdf文字

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.tools.imageio.ImageIOUtil;
import net.sourceforge.tess4j.Tesseract;
import net.sourceforge.tess4j.TesseractException;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class PDFTextRecognition {
    public static void main(String[] args) {
        try {
            // 1. 读取PDF文件
            PDDocument document = PDDocument.load(new File("path/to/pdf/file.pdf"));

            // 2. 将每一页转换为图像
            PDFRenderer renderer = new PDFRenderer(document);
            for (int i = 0; i < document.getNumberOfPages(); i++) {
                BufferedImage image = renderer.renderImageWithDPI(i, 300); // 设置图像分辨率为300 DPI
                ImageIOUtil.writeImage(image, "path/to/output/image" + i + ".png", 300);
            }

            // 3. 使用OCR识别图像中的文字
            Tesseract tesseract = new Tesseract();
            tesseract.setDatapath("path/to/tessdata"); // 设置Tesseract的语言数据文件路径
            StringBuilder result = new StringBuilder();
            for (int i = 0; i < document.getNumberOfPages(); i++) {
                File imageFile = new File("path/to/output/image" + i + ".png");
                String text = tesseract.doOCR(imageFile);
                result.append(text);
            }

            // 4. 处理识别结果
            System.out.println(result.toString());

            // 关闭PDF文档
            document.close();
        } catch (IOException | TesseractException e) {
            e.printStackTrace();
        }
    }
}