java在线预览txt、word、ppt、execel，pdf代码

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();