工作中遇到问题,将已经加密的 pdf 文档转换为图片。解决如下:
1、先添加依赖进去。
<dependency> <groupId>org.apache.pdfbox</groupId> <artifactId>fontbox</artifactId> <version>2.0.1</version> </dependency> <dependency> <groupId>org.apache.pdfbox</groupId> <artifactId>pdfbox</artifactId> <version>2.0.1</version> </dependency> <dependency> <groupId>com.lowagie</groupId> <artifactId>itext</artifactId> <version>2.1.7</version> </dependency>
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2、直接上代码 (亲测)。
import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import com.spire.pdf.PdfDocument; import com.spire.pdf.security.PdfEncryptionKeySize; import com.spire.pdf.security.PdfPermissionsFlags; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.rendering.PDFRenderer; import com.lowagie.text.pdf.PdfReader; public class PdfToImg { public static void main(String[] args) throws Exception { PdfDocument doc = new PdfDocument(); doc.loadFromFile("D:\\aaa.pdf", "这里是打开文档的密码,如果不加给个空就行"); doc.getSecurity().encrypt("", "", PdfPermissionsFlags.getDefaultPermissions(), PdfEncryptionKeySize.Key_256_Bit, "这里是允许编辑文档的密码,如果不加给个空就行"); doc.saveToFile("D:\\bbb.pdf"); doc.close(); pdf2Image("D:\\bbb.pdf", "D:\\pdf\\", 400); }
public static void pdf2Image(String PdfFilePath, String dstImgFolder, int dpi) { File file = new File(PdfFilePath); PDDocument pdDocument; try { String imgPDFPath = file.getParent(); int dot = file.getName().lastIndexOf('.'); String imagePDFName = file.getName().substring(0, dot); String imgFolderPath = null; if (dstImgFolder.equals("")) { imgFolderPath = imgPDFPath + File.separator + imagePDFName; } else { imgFolderPath = dstImgFolder + File.separator + imagePDFName; } if (createDirectory(imgFolderPath)) { pdDocument = PDDocument.load(file); PDFRenderer renderer = new PDFRenderer(pdDocument); PdfReader reader = new PdfReader(PdfFilePath); int pages = reader.getNumberOfPages(); StringBuffer imgFilePath = null; for (int i = 0; i < pages; i++) { String imgFilePathPrefix = imgFolderPath + File.separator + imagePDFName; imgFilePath = new StringBuffer(); imgFilePath.append(imgFilePathPrefix); imgFilePath.append("_"); imgFilePath.append(String.valueOf(i + 1)); imgFilePath.append(".png"); File dstFile = new File(imgFilePath.toString()); BufferedImage image = renderer.renderImageWithDPI(i, dpi); ImageIO.write(image, "png", dstFile); } System.out.println("PDF文档转PNG图片成功!"); } else { System.out.println("PDF文档转PNG图片失败:" + "创建" + imgFolderPath + "失败"); } } catch (IOException e) { e.printStackTrace(); } } private static boolean createDirectory(String folder) { File dir = new File(folder); if (dir.exists()) { return true; } else { return dir.mkdirs(); } } }
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