java在线预览txt、word、ppt、exec…

来源：互联网发布：大华网络摄像机复位编辑：程序博客网时间：2024/05/19 12:25

今天在CSDN博客中看到这篇文章，感觉很有用就ctrl+v了一下

在页面上显示各种文档中的内容。在servlet中的逻辑

word：

BufferedInputStream bis = null;
  URL url = null;
  HttpURLConnection httpUrl =null; // 建立链接
  url = new URL(urlReal);
  httpUrl = (HttpURLConnection)url.openConnection();// 连接指定的资源
  httpUrl.connect();//获取网络输入流
  bis = newBufferedInputStream(httpUrl.getInputStream());

String bodyText = null;
  WordExtractor ex = newWordExtractor(bis);
  bodyText = ex.getText();
  response.getWriter().write(bodyText);

excel：

content = new StringBuffer();
  HSSFWorkbook workbook = newHSSFWorkbook(bis);
  for (int numSheets = 0;numSheets < workbook.getNumberOfSheets(); numSheets++) {
   HSSFSheetaSheet = workbook.getSheetAt(numSheets);// 获得一个sheet
   content.append("/n");
   if (null ==aSheet) {
    continue;
   }
   for (introwNum = 0; rowNum <= aSheet.getLastRowNum(); rowNum++) {
    content.append("/n");
    HSSFRowaRow = aSheet.getRow(rowNum);
    if(null == aRow) {
     continue;
    }
    for(short cellNum = 0; cellNum <= aRow.getLastCellNum(); cellNum++){
     HSSFCellaCell = aRow.getCell(cellNum);
     if(null == aCell) {
      continue;
     }
     if(aCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
      content.append(aCell.getRichStringCellValue()
        .getString());
     }else if (aCell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {
      booleanb = HSSFDateUtil.isCellDateFormatted(aCell);
      if(b) {
       Datedate = aCell.getDateCellValue();
       SimpleDateFormatdf = new SimpleDateFormat(
         "yyyy-MM-dd");
       content.append(df.format(date));
      }
     }
    }
   }
  }
  response.getWriter().write(content.toString());

ppt：

StringBuffer content = new StringBuffer("");
  SlideShow ss = newSlideShow(new HSLFSlideShow(bis));
  Slide[] slides =ss.getSlides();
  for (int i = 0; i <slides.length; i++) {
   TextRun[] t =slides[i].getTextRuns();
   for (int j =0; j < t.length; j++) {
    content.append(t[j].getText());
   }
   content.append(slides[i].getTitle());
  }
  response.getWriter().write(content.toString());

pdf：

PDDocument pdfdocument = null;
  PDFParser parser = newPDFParser(bis);
  parser.parse();
  pdfdocument =parser.getPDDocument();
  ByteArrayOutputStream out = newByteArrayOutputStream();
  OutputStreamWriter writer = newOutputStreamWriter(out);
  PDFTextStripper stripper = newPDFTextStripper();
  stripper.writeText(pdfdocument.getDocument(),writer);
  writer.close();
  byte[] contents =out.toByteArray();

String ts = new String(contents);
response.getWriter().write(ts);

txt：

BufferedReader bis = null;
  URL url = null;
  HttpURLConnection httpUrl =null; // 建立链接
  url = new URL(urlReal);
  httpUrl = (HttpURLConnection)url.openConnection();// 连接指定的资源
  httpUrl.connect();//获取网络输入流
  bis = newBufferedReader( newInputStreamReader(httpUrl.getInputStream()));

StringBuffer buf=new StringBuffer();
  String temp;
  while ((temp = bis.readLine())!= null) {
   buf.append(temp);
   response.getWriter().write(temp);
   if(buf.length()>=1000){
    break;
   }
  }
  bis.close();

0 0