Java快速实现PDF转图片功能实例代码

<!--pdf转图片-->
<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>2.0.29</version>
</dependency>

import lombok.extern.slf4j.Slf4j;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * @Author: 公众号：知识浅谈
 * @Description: pdf转图片工具类
 * @Version: 1.0
 */
@Slf4j
public class PdfToImageUtil {
    /*dpi 越大图片越清晰*/
    private static final Integer DPI = 100;

    /*转换后图片类型*/
    private static final String IMG_TYPE = "jpg";

    /**
     * PDF转图片(多页)
     * @param fileContent pdf文件的二进制流
     * @return 图片文件的二进制流
     * @throws Exception
     */
    public static List<byte[]> pdfToImage(byte[] fileContent) throws Exception {
        List<byte[]> imageList = new ArrayList<byte[]>();
        PDDocument document=null;
        try{
            document = PDDocument.load(fileContent);
            PDFRenderer pdfRenderer = new PDFRenderer(document);
            for (int i = 0; i < document.getNumberOfPages(); i++) {
                BufferedImage bufferedImage = pdfRenderer.renderImageWithDPI(i, DPI);
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                ImageIO.write(bufferedImage, IMG_TYPE, out);
                imageList.add(out.toByteArray());
            }
        }finally {
            document.close();
        }
        return imageList;
    }


    /**
     * PDF转图片(单页)
     * @param fileContent pdf文件的二进制流
     * @return 图片文件的二进制流
     * @throws Exception
     */
    public static byte[] pdfToImageOne(byte[] fileContent) throws Exception {
        byte[] image = null;
        PDDocument document=null;
        try{
            document = PDDocument.load(fileContent);
            PDFRenderer pdfRenderer = new PDFRenderer(document);
            BufferedImage bufferedImage = pdfRenderer.renderImageWithDPI(0, DPI);
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            ImageIO.write(bufferedImage, IMG_TYPE, out);
            image = out.toByteArray();
        }finally {
            document.close();
        }
        return image;
    }

    public static Boolean saveImage(byte[] imageBytes, String savePath,String fileName) throws Exception {
        try {
            BufferedImage image = ImageIO.read(new ByteArrayInputStream(imageBytes));
            File directory = new File(savePath);
            if(!directory.exists()){
                directory.mkdirs();
            }
            File file1 = new File(directory,fileName);
            return ImageIO.write(image, IMG_TYPE, file1);
        } catch (IOException e) {
            log.error("保存文件错误");
            return false;
        }
    }
}

 * pdf转图片
 */
@GetMapping(value = "/pdfToPng")
@Log(title = "证件模板", businessType = BusinessType.OTHER)
public void pdfToPng(HttpServletRequest request,HttpServletResponse response) {
    try {
        File file = new File("D:\\pdf\\test.pdf");
        FileInputStream fileInputStream = new FileInputStream(file);
        byte[] pdfBytes = new byte[(int) file.length()];
        fileInputStream.read(pdfBytes);
        fileInputStream.close();

        byte[] bytes = PdfToImageUtil.pdfToImageOne(pdfBytes);
        ServletOutputStream outputStream = response.getOutputStream();
        response.setContentType("image/jpeg");
        response.setContentLength(bytes.length);
        outputStream.write(bytes);
    }catch (Exception e){
        log.error("pdf转图片异常{}", e.getMessage());
    }
}