/*** 文件显示的控制函数，由此来判断文件类型并调用相关方法* @return*/public String lookUpfileValue(){//获取web上下文对象ServletContext sc = ServletActionContext.getServletContext();//获得服务器上文件所在地址String realPath = sc.getRealPath("/upload");//获得文件全路径String filePath = realPath + File.separatorChar +ftObj.getStoreFileName() ;String strFileName = ftObj.getStoreFileName().substring(0, ftObj.getStoreFileName().lastIndexOf("."));//获得文件扩展名String extensions =ftObj.getStoreFileName().substring(ftObj.getStoreFileName().lastIndexOf("."),ftObj.getStoreFileName().length());//创建FileTable该类用来封装文件的属性包括作者，文件名等FileTable fileTableObj=new FileTable();String filename1 =strFileName.substring(0,strFileName.length()-13);fileTableObj.setFileName(filename1);fileTableObj.setAuthor(ftObj.getAuthor());ftObj =fileTableObj;/*** 以下为根据后缀判断文件类型并进行方法调用*/try {//如果是excel文件if(extensions.equals(".xls")){//获得文件放置路径String fWPath = sc.getRealPath("/fileManagement");fWPath = fWPath+"\\";//生成临时文件的字符串String fWPath2 =fWPath+ "temp.pdf";try {//保存临时文件
                        saveExcelAsPdf(filePath,fWPath2);//创建临时File file=new File(fWPath2); //将Pdf转成图片pdfStrList  =reapdf(file,realPath);System.gc();//删除临时文件boolean success = file.delete();System.out.println(success);} catch (Throwable e) {}return "lookupPdf";}else if(extensions.equals(".doc")){String fWPath = sc.getRealPath("/fileManagement");try {readword(filePath,fWPath);} catch (Throwable e) {}}else if(extensions.equals(".pdf")){File fobj = new File (filePath);fname = FileTableAction.getTextFromPdf(filePath);pdfStrList  =reapdf(fobj,realPath);return "lookupPdf";}else{fname = FileTableAction.readTxt(filePath);return "lookupnohtml";}} catch (Exception e) {}return "lookup";}

/*** 读取txt文档的方法* @param txt* @return*/public static String readTxt(String txt){StringBuffer sb = new StringBuffer();try {// 创建文件字符流对象FileReader read = new FileReader(new File(txt));//创建字符缓存char ch[] = new char[1024];//将文件读入到缓存int d = read.read(ch);while(d!=-1){String str = new String(ch,0,d);sb.append(str);d = read.read(ch);}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return sb.toString();}

//读起word文档public static void  readword(String filepath,String fwpath) throws Throwable{//获得文件的路径String path = filepath.substring(0,filepath.lastIndexOf("\\"))+"\\";//创建输入流InputStream input = new FileInputStream(filepath);//创建HWPFDocument对象，这里用了第三方的插件poiHWPFDocument wordDocument = new HWPFDocument(input);//创建word到html的转换对象WordToHtmlConverter wordToHtmlConverter = new WordToHtmlConverter(DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument());//设置word到html的转换对象的图像管理属性wordToHtmlConverter.setPicturesManager(new PicturesManager() {public String savePicture(byte[] content, PictureType pictureType, String suggestedName, float widthInches, float heightInches) {return suggestedName;}});wordToHtmlConverter.processDocument(wordDocument);//获得该word中所有的图片List pics = wordDocument.getPicturesTable().getAllPictures();if (pics != null) {for (int i = 0; i < pics.size(); i++) {Picture pic = (Picture) pics.get(i);try {pic.writeImageContent(new FileOutputStream(path + pic.suggestFullFileName()));} catch (FileNotFoundException e) {e.printStackTrace();}}}//由    word到html的转换对象创建dom对象Document htmlDocument = wordToHtmlConverter.getDocument();//创建字节输出输出流ByteArrayOutputStream outStream = new ByteArrayOutputStream();//创建dorm的数据源对象DOMSource domSource = new DOMSource(htmlDocument);//创建结果输出流StreamResult streamResult = new StreamResult(outStream);//创建转化工厂TransformerFactory tf = TransformerFactory.newInstance();Transformer serializer = tf.newTransformer();/*** 以下为编码，样式的属性设置*/serializer.setOutputProperty(OutputKeys.ENCODING, "GBK");serializer.setOutputProperty(OutputKeys.INDENT, "yes");serializer.setOutputProperty(OutputKeys.METHOD, "html");serializer.transform(domSource, streamResult);outStream.close();//获得内容的字符串对象String content = new String(outStream.toByteArray());
        String temp = "<%@ page language=\"java\" import=\"java.util.*\" pageEncoding=\"utf-8\"%><br> <%@taglib prefix=\"s\"  uri=\"/struts-tags\"%>";temp =temp + content.replace("<img src=\"","<img src=\""+"${pageContext.request.contextPath}/upload/");
//        System.out.println(temp);String itemp = temp.replace("</style>", ".SelectId{" +"-webkit-user-select:none; /* Webkit */ " +" -moz-user-select:none; /* Firefox */" +" -ms-user-select:none; /* IE10+ */ " +"} </style>");itemp = itemp.replace("<body class=\"b1 b2\">", "<body class=\"b1 b2\"> \r <div style=\"margin-left:100px;;margin-top:20px;\" class=\"SelectId\">");itemp =itemp.replace("</body>", "</div> </body>");//写回文件到前端显示FileUtils.write(new File(fwpath, "abc.jsp"), itemp, "utf-8");}

//生成pdf生成图片public static List<String> reapdf(File file,String upleadpath) throws IOException {List<String> strlist = new ArrayList<String>();//创建随即读取文件留RandomAccessFile raf = new RandomAccessFile(file, "r");FileChannel channel = raf.getChannel();ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());//创建PDF文件对象PDFFile pdffile = new PDFFile(buf);//显示Pdf文件页数    System.out.println("页数： " + pdffile.getNumPages());//根据页数生成图片for (int i = 1; i <= pdffile.getNumPages(); i++) {// 创建pdf 页对象PDFPage page = pdffile.getPage(i);// 获得图片的宽度和长度Rectangle rect = new Rectangle(0, 0, (int) page.getBBox().getWidth(), (int) page.getBBox().getHeight());// 创建文件对象Image img = page.getImage(rect.width*2, rect.height*2, // width &rect, // clip rectnull, // null for the ImageObservertrue, // fill background with whitetrue // block until drawing is done
                    );//创建图片缓存BufferedImage tag = new BufferedImage(rect.width*2, rect.height*2,BufferedImage.TYPE_INT_RGB);tag.getGraphics().drawImage(img, 0, 0, rect.width*2, rect.height*2,null);FileOutputStream out = new FileOutputStream(upleadpath+"\\"+ i + ".jpg"); // 输出到文件流strlist.add(i + ".jpg");JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);encoder.encode(tag); // JPEG编码
        out.close();buf.clear();channel.close();raf.close();}return strlist;}

//读起excel文档public static void  readexcel(String filepath,String fwpath) throws Throwable{//定义HSSFWorkbook对象
           HSSFWorkbook workbook;File f = new File(filepath);try{//根据文件路径获得HSSFWorkbook对象workbook = ExcelToHtmlUtils.loadXls( f );}catch ( Exception exc ){return;}//获得excel转化Html对象ExcelToHtmlConverter excelToHtmlConverter = new ExcelToHtmlConverter(DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument() );excelToHtmlConverter.processWorkbook(workbook );//创建写出对象StringWriter stringWriter = new StringWriter();/*** 设置转化的样式*/                Transformer transformer = TransformerFactory.newInstance().newTransformer();transformer.setOutputProperty( OutputKeys.ENCODING, "GBK" );transformer.setOutputProperty( OutputKeys.INDENT, "no" );transformer.setOutputProperty( OutputKeys.METHOD, "html" );transformer.transform(new DOMSource( excelToHtmlConverter.getDocument() ),new StreamResult( stringWriter ) );/*** 以下雷同word转化方法*/String temp = "<%@ page language=\"java\" import=\"java.util.*\" pageEncoding=\"utf-8\"%><br> <%@taglib prefix=\"s\"  uri=\"/struts-tags\"%>";temp =temp +stringWriter.toString();temp = temp.replace("<img src=\"","<img src=\""+"${pageContext.request.contextPath}/upload/");String itemp = temp.replace("</style>", ".SelectId{" +"-webkit-user-select:none; /* Webkit */ " +" -moz-user-select:none; /* Firefox */" +" -ms-user-select:none; /* IE10+ */ " +"} </style>");itemp = itemp.replace("<body class=\"b1\">", "<body  class=\"b1\"> \r <div style=\"margin-left:100px;;margin-top:20px;\" class=\"SelectId\">");itemp=itemp.replace("</body>", "</div> </body>");FileUtils.write(new File(fwpath, "abc.jsp"), itemp, "utf-8");}

    //根据时间生成文件名的方法（其实完全可以用uuid生成）public String getDateStr(){Calendar cl = Calendar.getInstance();cl.setTime(new Date());String str = cl.get(Calendar.YEAR) + "" + (cl.get(Calendar.MONTH) + 1) + "" + cl.get(Calendar.DATE) + "" + cl.get(Calendar.HOUR) + "" + cl.get(Calendar.MINUTE) + "" + cl.get(Calendar.SECOND);return str;}

private String path;public static boolean runFlag = false;public void saveExcelAsPdf(String filePath, String outFile) {ComThread.InitSTA();//根据pid获得ActiveXComponent对象，这个pid对应在你的注册表中，如果没有说明你的电脑上的office//未安装或安装出问题，需要重新安装，否则该程序不能用ActiveXComponent actcom = new ActiveXComponent("Excel.Application");Dispatch excel = null;try {/*** 以下为对excel文档的操作，来自网上的资料笔者亦不懂其中的意思*/System.out.println((new Date()).toString()+ "  start convert from : " + filePath + " to " + outFile);actcom.setProperty("Visible", new Variant(false));Dispatch excels = actcom.getProperty("Workbooks").toDispatch();excel = Dispatch.invoke(excels,"Open",Dispatch.Method,new Object[] { filePath, new Variant(false),new Variant(false) }, new int[9]).toDispatch();Dispatch.invoke(excel, "SaveAs", Dispatch.Method, new Object[] {outFile, new Variant(57), new Variant(false),new Variant(57), new Variant(57), new Variant(false),new Variant(true), new Variant(57), new Variant(false),new Variant(true), new Variant(false) }, new int[1]);} catch (Exception es) {es.printStackTrace();} finally {Dispatch.call(excel, "Close", new Variant(false));if (actcom != null) {actcom.invoke("Quit", new Variant[] {});actcom = null;}ComThread.Release();}}/*** 该方法批次将excel文档转化为pdf文档，之后pdf文档的显示已经在上面介绍中给出。*/public void listAllFile(){runFlag = true;String fileName = "", appdex = "";File temp = null;try{File[] list = new File(path).listFiles(new FileFilter(){public boolean accept(File pathname){boolean x = false;if (pathname.getName().toLowerCase().endsWith(".xls")){x = true;}return x;}});System.out.println((new Date()).toString() + "  Total Convert File : " + list.length);for (int i = 0; i < list.length; i++){fileName = list[i].getName().substring(0, list[i].getName().indexOf("."));appdex = list[i].getName().substring(list[i].getName().indexOf("."));temp = new File(path + fileName + ".pdf");if (temp.exists()){temp.renameTo(new File(path + fileName + "-" + getDateStr() + ".pdf"));}saveExcelAsPdf(path + fileName + appdex, path + fileName + ".pdf");}} catch (Exception ex){ex.printStackTrace();}runFlag = false;}