pdf转高清图片

article/2025/4/23 15:28:23

很多人在java中遇到ppt/pdf转图片的时候，有些插图图片转不了或者是转出来的图片不清晰，也都是使用的官方jar包。有些是需要引用到icepdf插件的，这里不细说了，直接放一段稍微简单一点的代码供参考：

package test;import com.lowagie.text.pdf.PdfReader;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;public class pdfToImage {public static void main(String[] args) {change("C:\\Users\\Administrator\\Desktop\\pdf\\用户手册V1.pdf", "C:\\Users\\Administrator\\Desktop\\pdf", 200);}public static void change(String PdfFilePath, String ImgFolder, 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 (ImgFolder.equals("")) {imgFolderPath = imgPDFPath + File.separator + imagePDFName;} else {imgFolderPath = ImgFolder + 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("文档转转成功！");} else {System.out.println("文档转换失败：" + "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();}}}