package gcjsxh.util;import java.awt.p_w_picpath.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.util.Iterator;import javax.p_w_picpathio.IIOImage;import javax.p_w_picpathio.ImageIO;import javax.p_w_picpathio.ImageWriter;import javax.p_w_picpathio.stream.ImageOutputStream;import org.icepdf.core.pobjects.Document;import org.icepdf.core.pobjects.Page;import org.icepdf.core.util.GraphicsRenderingHints;public class CapturePdfFirstPageUtil {  /**      * 生成一本书的缩略图     * @param inputFile        需要生成缩略图的书籍的完整路径     * @param outputFile    生成缩略图的放置路径     */    public static void generateBookIamge(String inputFile, String outputFile) {        Document document = null;                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 = 0.8f;                        document = new Document();            document.setFile(inputFile);             // maxPages = document.getPageTree().getNumberOfPages();                        BufferedImage p_w_picpath = (BufferedImage)document.getPageImage(0, GraphicsRenderingHints.SCREEN,                         Page.BOUNDARY_CROPBOX, rotation, zoom);                        Iterator iter = ImageIO.getImageWritersBySuffix("jpg");            ImageWriter writer = (ImageWriter)iter.next();                        FileOutputStream out = new FileOutputStream(new File(outputFile));            ImageOutputStream outImage = ImageIO.createImageOutputStream(out);                        writer.setOutput(outImage);            writer.write(new IIOImage(p_w_picpath, null, null));                } catch(Exception e) {        System.out.println( "to generate thumbnail of a book fail : " + inputFile );        System.out.println( e );        }     }        public static void main(String[]args){    CapturePdfFirstPageUtil.generateBookIamge("C:\\Users\\work\\Desktop\\spring2.pdf","C:\\Users\\work\\Desktop\\captureImage.jpg") ;    }    }

icepdf jar包地址:

注意上面引入jar包时不要引错了哦