Java PDF轉圖片

maven依賴：

      <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>2.0.4</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.lowagie</groupId>
            <artifactId>itext</artifactId>
            <version>2.1.7</version>
        </dependency>    

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;

import com.lowagie.text.pdf.PdfReader;
public class test1 {

    public static void main(String[] args) {
            pdf2Image("D:/1.pdf", "D:/pdf", 130);
        }

        /***
         * PDF文件轉PNG圖片，所有頁數
         *
         * @param PdfFilePath pdf完整路徑
         * @param imgFilePath 圖片存放的文件夾
         * @param dpi dpi越大轉換後越清晰，相對轉換速度越慢
         * @return
         */
        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); // 獲取圖片文件名
                String imgFolderPath = null;
                if (dstImgFolder.equals("")) {
                    imgFolderPath = imgPDFPath + File.separator + imagePDFName;// 獲取圖片存放的文件夾路徑
                } else {
                    imgFolderPath = dstImgFolder + File.separator + imagePDFName;
                }

                if (createDirectory(imgFolderPath)) {

                    pdDocument = PDDocument.load(file);
                    PDFRenderer renderer = new PDFRenderer(pdDocument);
                /* dpi越大轉換後越清晰，相對轉換速度越慢 */
                    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文檔轉PNG圖片成功！");

                } else {
                    System.out.println("PDF文檔轉PNG圖片失敗：" + "建立" + imgFolderPath + "失敗");
                }

            } 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();
            }
        }


}