java实现遍历文件夹内pdf分别转成一张jpg图片

import java.awt.Image; import java.awt.Rectangle; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.RandomAccessFile; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; import javax.imageio.ImageIO; import javax.swing.SwingUtilities; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGEncodeParam; import com.sun.image.codec.jpeg.JPEGImageEncoder; import com.sun.pdfview.PDFFile; import com.sun.pdfview.PDFPage; public class PdfToJpgTest { public static String pdfPath = "d://pdf//"; public static String jpgPath = "d://jpg//"; public static void setup() throws IOException { // load a pdf from a byte buffer File dir = new File(PdfToJpgTest.pdfPath); File[] fs = dir.listFiles(); for (int a = 0; a < fs.length; a++) { File file = fs[a]; RandomAccessFile raf = new RandomAccessFile(file, "r"); FileChannel channel = raf.getChannel(); ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size()); PDFFile pdffile = new PDFFile(buf); int pageCounts = pdffile.getNumPages(); System.out.println("页数： " + pageCounts); System.out.println("PdfToJpgTest.jpgPath is :" + PdfToJpgTest.jpgPath); for (int i = 1; i <= pdffile.getNumPages(); i++) { // draw the first page to an image PDFPage page = pdffile.getPage(i); // get the width and height for the doc at the default zoom Rectangle rect = new Rectangle(0, 0, (int) page.getBBox() .getWidth(), (int) page.getBBox().getHeight()); // generate the image Image img = page.getImage(rect.width, rect.height, // width & // height rect, // clip rect null, // null for the ImageObserver true, // fill background with white true // block until drawing is done ); BufferedImage tag = new BufferedImage(rect.width, rect.height, BufferedImage.TYPE_INT_RGB); tag.getGraphics().drawImage(img, 0, 0, rect.width, rect.height, null); // 输出到文件流 FileOutputStream out = new FileOutputStream( PdfToJpgTest.jpgPath + "\\" + i + ".jpg"); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(tag); param.setQuality(1f, false);// 1f是提高生成的图片质量 encoder.setJPEGEncodeParam(param); encoder.encode(tag); // JPEG编码 out.close(); } // 合并图片至一张图片 File d = new File(PdfToJpgTest.jpgPath); File list[] = d.listFiles(); if (pageCounts > 0) { BufferedImage Image = ImageIO.read(list[0]); int width = Image.getWidth();// 图片宽度 int height = Image.getHeight();// 图片高度 BufferedImage ImageNew = new BufferedImage(width, height * pageCounts, BufferedImage.TYPE_INT_RGB); for (int j = 1; j <= pageCounts; j++) { File jpgFile = new File(PdfToJpgTest.jpgPath + j + ".jpg"); Image = ImageIO.read(jpgFile); // 从图片中读取RGB int[] ImageArray = new int[width * height]; ImageArray = Image.getRGB(0, 0, width, height, ImageArray, 0, width); ImageNew.setRGB(0, height * (j - 1), width, height, ImageArray, 0, width);// 拼装图片 // 处理一张删除一张 jpgFile.delete(); } File outFile = new File(PdfToJpgTest.jpgPath + file.getName().substring(0, file.getName().lastIndexOf(".")) + ".jpg"); ImageIO.write(ImageNew, "jpg", outFile);// 写图片 System.out.println(file.getName() + "图片生成成功！"); } } } public static void main(final String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { try { PdfToJpgTest.setup(); } catch (IOException ex) { ex.printStackTrace(); } } }); } }