java实现PDF转图片的方法

<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>

public class PDFToImgUtil {  private static Logger logger = LoggerFactory.getLogger(PDFToImgUtil.class);   /** * 获取PDF总页数 * @throws IOException  */ public static int getPDFNum(String fileUrl) throws IOException { PDDocument pdDocument = null; int pages = 0; try {  pdDocument = getPDDocument(fileUrl);  pages = pdDocument.getNumberOfPages(); } catch (Exception e) {  e.printStackTrace();   logger.error(e.getMessage(),e); } finally {  if (pdDocument != null) {  pdDocument.close();  } } return pages; }   /** * PDF转图片 根据页码一页一页转  * @throws IOException  * imgType:转换后的图片类型 jpg,png */ public static void PDFToImg(OutputStream sos,String fileUrl,int page,String imgType) throws IOException { PDDocument pdDocument = null; /* dpi越大转换后越清晰，相对转换速度越慢 */ int dpi = 100; try {  pdDocument = getPDDocument(fileUrl);  PDFRenderer renderer = new PDFRenderer(pdDocument);  int pages = pdDocument.getNumberOfPages();  if (page <= pages && page > 0) {  BufferedImage image = renderer.renderImageWithDPI(page,dpi);  ImageIO.write(image, imgType, sos);  } } catch (Exception e) {  e.printStackTrace();   logger.error(e.getMessage(),e); } finally {  if (pdDocument != null) {  pdDocument.close();  } }  }   private static PDDocument getPDDocument(String fileUrl) throws IOException { File file = new File(fileUrl); FileInputStream inputStream = new FileInputStream(file);   return PDDocument.load(inputStream); } }