java在线预览txt、word、ppt、execel，pdf代码

  1 在页面上显示各种文档中的内容。在servlet中的逻辑
  2  
  3 word：
  4  
  5 BufferedInputStream bis = null;
  6 URL url = null;
  7 HttpURLConnection httpUrl = null; // 建立链接
  8 url = new URL(urlReal);
  9 httpUrl = (HttpURLConnection) url.openConnection();// 连接指定的资源
 10 httpUrl.connect();// 获取网络输入流
 11 bis = new BufferedInputStream(httpUrl.getInputStream());
 12  
 13 String bodyText = null;
 14 WordExtractor ex = new WordExtractor(bis);
 15 bodyText = ex.getText();
 16 response.getWriter().write(bodyText);
 17  
 18 excel：
 19  
 20 BufferedInputStream bis = null;
 21 URL url = null;
 22 HttpURLConnection httpUrl = null; // 建立链接
 23 url = new URL(urlReal);
 24 httpUrl = (HttpURLConnection) url.openConnection();// 连接指定的资源
 25 httpUrl.connect();// 获取网络输入流
 26 bis = new BufferedInputStream(httpUrl.getInputStream());
 27  
 28 content = new StringBuffer();
 29 HSSFWorkbook workbook = new HSSFWorkbook(bis);
 30 for (int numSheets = 0; numSheets < workbook.getNumberOfSheets(); numSheets++) {
 31 HSSFSheet aSheet = workbook.getSheetAt(numSheets);// 获得一个sheet
 32 content.append("/n");
 33 if (null == aSheet) {
 34 continue;
 35 }
 36 for (int rowNum = 0; rowNum <= aSheet.getLastRowNum(); rowNum++) {
 37 content.append("/n");
 38 HSSFRow aRow = aSheet.getRow(rowNum);
 39 if (null == aRow) {
 40 continue;
 41 }
 42 for (short cellNum = 0; cellNum <= aRow.getLastCellNum(); cellNum++) {
 43 HSSFCell aCell = aRow.getCell(cellNum);
 44 if (null == aCell) {
 45 continue;
 46 }
 47 if (aCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
 48 content.append(aCell.getRichStringCellValue()
 49 .getString());
 50 } else if (aCell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {
 51 boolean b = HSSFDateUtil.isCellDateFormatted(aCell);
 52 if (b) {
 53 Date date = aCell.getDateCellValue();
 54 SimpleDateFormat df = new SimpleDateFormat(
 55 "yyyy-MM-dd");
 56 content.append(df.format(date));
 57 }
 58 }
 59 }
 60 }
 61 }
 62 response.getWriter().write(content.toString());
 63  
 64 ppt：
 65  
 66 BufferedInputStream bis = null;
 67 URL url = null;
 68 HttpURLConnection httpUrl = null; // 建立链接
 69 url = new URL(urlReal);
 70 httpUrl = (HttpURLConnection) url.openConnection();// 连接指定的资源
 71 httpUrl.connect();// 获取网络输入流
 72 bis = new BufferedInputStream(httpUrl.getInputStream());
 73  
 74 StringBuffer content = new StringBuffer("");
 75 SlideShow ss = new SlideShow(new HSLFSlideShow(bis));
 76 Slide[] slides = ss.getSlides();
 77 for (int i = 0; i < slides.length; i++) {
 78 TextRun[] t = slides[i].getTextRuns();
 79 for (int j = 0; j < t.length; j++) {
 80 content.append(t[j].getText());
 81 }
 82 content.append(slides[i].getTitle());
 83 }
 84 response.getWriter().write(content.toString());
 85  
 86 pdf：
 87  
 88 BufferedInputStream bis = null;
 89 URL url = null;
 90 HttpURLConnection httpUrl = null; // 建立链接
 91 url = new URL(urlReal);
 92 httpUrl = (HttpURLConnection) url.openConnection();// 连接指定的资源
 93 httpUrl.connect();// 获取网络输入流
 94 bis = new BufferedInputStream(httpUrl.getInputStream());
 95  
 96 PDDocument pdfdocument = null;
 97 PDFParser parser = new PDFParser(bis);
 98 parser.parse();
 99 pdfdocument = parser.getPDDocument();
100 ByteArrayOutputStream out = new ByteArrayOutputStream();
101 OutputStreamWriter writer = new OutputStreamWriter(out);
102 PDFTextStripper stripper = new PDFTextStripper();
103 stripper.writeText(pdfdocument.getDocument(), writer);
104 writer.close();
105 byte[] contents = out.toByteArray();
106  
107 String ts = new String(contents);
108 response.getWriter().write(ts);
109  
110 txt：
111  
112 BufferedReader bis = null;
113 URL url = null;
114 HttpURLConnection httpUrl = null; // 建立链接
115 url = new URL(urlReal);
116 httpUrl = (HttpURLConnection) url.openConnection();// 连接指定的资源
117 httpUrl.connect();// 获取网络输入流
118 bis = new BufferedReader( new InputStreamReader(httpUrl.getInputStream()));
119  
120 StringBuffer buf=new StringBuffer();
121 String temp;
122 while ((temp = bis.readLine()) != null) {
123 buf.append(temp);
124 response.getWriter().write(temp);
125 if(buf.length()>=1000){
126 break;
127 }
128 }
129 bis.close();
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原文地址：https://www.cnblogs.com/lr393993507/p/5542901.html