<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>   
 

package test;

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 PDF2IMAGE {
	public static void main(String[] args) {
		pdf2Image("D:/1.pdf", "D:/pdf", 300);
	}

	/***
	 * PDF檔案轉PNG圖片，全部頁數
	 * 
	 * @param PdfFilePath pdf完整路徑
	 * @param imgFilePath 圖片存放的資料夾
	 * @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); // 獲取圖片檔名
			String imgFolderPath = null;
			if (dstImgFolder.equals("")) {
				imgFolderPath = imgPDFPath + File.separator + imagePDFName;// 獲取圖片存放的資料夾路徑
			} 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文件轉PNG圖片成功！");

			} else {
				System.out.println("PDF文件轉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();
		}
	}

}