pdf转成图片

  所用插件为pdfbox

1.用apache的pdf转换插件：https://pdfbox.apache.org/downloads.html

2.在线开发文档：https://pdfbox.apache.org/docs/2.0.1/javadocs/

3.代码如下

public List pdfFileToPic(String picName,File invoiceFile
   ,String invoiceTypeCode) throws Exception{
  List picPathList = new ArrayList();
  PDDocument doc = PDDocument.load(invoiceFile);
  PDFRenderer reader = new PDFRenderer(doc);
  int pageNo = doc.getNumberOfPages();
  for (int i = 0; i < pageNo; i++) {
   //1.将pdf转为图片
   BufferedImage bfi = reader.renderImageWithDPI(i, 96);
   //2.获取图片存储路劲
   File file2 = ocrRecognitionService.getPicPath(picName);
   ImageIO.write(bfi, picName.split(" \\.")[1], file2);
   /*
    * 3.新建发票实体类并设置发票的存放路劲
    * 若发票为专票或是普票则将发票图片变成二进制数组 传回 待发票识别时使用
    */
   EcdInvoiceOcrDto ecdInvoiceOcrDto = new EcdInvoiceOcrDto();
   ByteArrayOutputStream bos = null;
   FileInputStream fis=null;
   try {
    if(invoiceTypeCode.equals(IConstants.INVOICE_TYPE_SPECIAL)
      ||invoiceTypeCode.equals(IConstants.INVOICE_TYPE_PLAIN)){
     bos = new ByteArrayOutputStream();
     fis = new FileInputStream(file2);
     byte[] data=new byte[2048];
     int len=0;
     while((len=fis.read(data))!=-1){
      bos.write(data, 0, len);
     }
     bos.flush();
     ecdInvoiceOcrDto.setImageStreamStr(new BASE64Encoder().encode(bos.toByteArray()));
    }
   } catch (Exception e) {
    logger.error("读取图片成二进制数组失败",e);
    throw new Exception();
   }finally{
    if(bos!=null){
     bos.close();
    }
    if(fis!=null){
     fis.close();
    }
   }
   
   ecdInvoiceOcrDto.setPicPath(file2.getAbsolutePath());
   ecdInvoiceOcrDto.setImageName(file2.getName());
   picPathList.add(ecdInvoiceOcrDto);
  }
  return picPathList;
 }