排除 jai_core 是因为在导入包时会报错：jai_core missing，直接排除即可。

import org.icepdf.core.pobjects.Document;
import org.icepdf.core.pobjects.Page;
import org.icepdf.core.util.GraphicsRenderingHints;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.util.Iterator;
 * 截取PDF文档第一页生成缩略图
public class CapturePdfFirstPageThumbnailUtil {
     * 生成缩略图
     * @param inputFile  需要生成缩略图的PDF文件路径
     * @param outputFile 生成缩略图的存储路径
    public static void generateThumbnail(String inputFile, String outputFile) {
        long start = System.currentTimeMillis();
        Document document;
        try {
            float rotation = 0f;
            // 缩略图显示倍数，1表示不缩放，0.5表示缩小到50%
            float zoom = 0.5f;
            document = new Document();
            document.setFile(inputFile);
            BufferedImage image = (BufferedImage) document.getPageImage(0,
                    GraphicsRenderingHints.SCREEN,
                    Page.BOUNDARY_CROPBOX, rotation, zoom);
            Iterator<ImageWriter> iter = ImageIO.getImageWritersBySuffix("jpg");
            ImageWriter writer = iter.next();
            FileOutputStream out = new FileOutputStream(outputFile);
            ImageOutputStream outImage = ImageIO.createImageOutputStream(out);
            writer.setOutput(outImage);
            writer.write(new IIOImage(image, null, null));
            System.out.println("耗时:" + (System.currentTimeMillis() - start) + "ms");
        } catch (Exception e) {
            e.printStackTrace();
    public static void main(String[] args) {
        String inputFilePath = "C:\\test.pdf";
        String outputFilePath = "C:\\test.jpg";
        generateThumbnail(inputFilePath, outputFilePath);
警告信息不用管，好像是因为用的不是PRO版本吧！
看了一下还挺耗时的。
  
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后端Java
 
  
     
 

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