java通过url在线预览Word、excel、ppt、pdf、txt文档

java通过url在线预览Word、excel、ppt、pdf、txt文档中的内容【只获得其中的文字】

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 = new BufferedInputStream(httpUrl.getInputStream());
   String bodyText = null;
   WordExtractor ex = new WordExtractor(bis);
   bodyText = ex.getText();
   response.getWriter().write(bodyText);

excel：

 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 = new BufferedInputStream(httpUrl.getInputStream());
 content = new StringBuffer();
   HSSFWorkbook workbook = new HSSFWorkbook(bis);
   for (int numSheets = 0; numSheets < workbook.getNumberOfSheets(); numSheets++) {
    HSSFSheet aSheet = workbook.getSheetAt(numSheets);// 获得一个sheet
    content.append("/n");
    if (null == aSheet) {
     continue;
    }
    for (int rowNum = 0; rowNum <= aSheet.getLastRowNum(); rowNum++) {
     content.append("/n");
     HSSFRow aRow = aSheet.getRow(rowNum);
     if (null == aRow) {
      continue;
     }
     for (short cellNum = 0; cellNum <= aRow.getLastCellNum(); cellNum++) {
      HSSFCell aCell = 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) {
       boolean b = HSSFDateUtil.isCellDateFormatted(aCell);
       if (b) {
        Date date = aCell.getDateCellValue();
        SimpleDateFormat df = new SimpleDateFormat(
          "yyyy-MM-dd");
        content.append(df.format(date));
       }
      }
     }
    }
   }
   response.getWriter().write(content.toString());

ppt：

 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 = new BufferedInputStream(httpUrl.getInputStream());
 StringBuffer content = new StringBuffer("");
   SlideShow ss = new SlideShow(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：

 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 = new BufferedInputStream(httpUrl.getInputStream());
  PDDocument pdfdocument = null;
   PDFParser parser = new PDFParser(bis);
   parser.parse();
   pdfdocument = parser.getPDDocument();
   ByteArrayOutputStream out = new ByteArrayOutputStream();
   OutputStreamWriter writer = new OutputStreamWriter(out);
   PDFTextStripper stripper = new PDFTextStripper();
   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 = new BufferedReader( new InputStreamReader(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();