在线预览文档简单例子
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以下是一个Java实现简单浏览器预览服务端文档的例子，文档包括pdf，excel，word，ppt，思路是将excel，word转化为html；将ppt转为图片，再转为html；将pdf以pdf流的形式返回给浏览器，一般的浏览器都支持预览pdf。
maven依赖
<dependency> <groupId>org.apache.poi</groupId> <artifactId>ooxml-schemas</artifactId> <version>1.1</version></dependency><dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.15</version></dependency><dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.15</version></dependency><dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-scratchpad</artifactId> <version>3.15</version></dependency><dependency> <groupId>fr.opensagres.xdocreport</groupId> <artifactId>org.apache.poi.xwpf.converter.core</artifactId> <version>1.0.4</version></dependency><dependency> <groupId>fr.opensagres.xdocreport</groupId> <artifactId>org.apache.poi.xwpf.converter.xhtml</artifactId> <version>1.0.4</version></dependency><dependency> <groupId>org.apache.xmlbeans</groupId> <artifactId>xmlbeans</artifactId> <version>2.5.0</version></dependency>
预览pdf
byte[] datas = readFile(f);response.setContentType("application/pdf");response.setContentLength(datas.length);OutputStream os = res.getOutputStream();os.write(datas, 0, datas.length);os.flush();os.close();预览页面
将转为html或者图片的文档，嵌入此html中返回给浏览器展示。
private static final StringBuilder ORIGIN_HTML = new StringBuilder("<!DOCTYPE html>\n" + "<html lang=\"en\">\n" + "<head>\n" + " <meta http-equiv=\"Content-Type\" content=\"text/html;charset=utf-8\" />\n" + " <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n" + " <title>预览</title>\n" + " <link rel=\"stylesheet\" href=\"/resource/css/simple.slide.css\">\n" + " <link rel=\"stylesheet\" href=\"/resource/css/preview.css\">\n" + " <script type=\"text/javascript\" src=\"../../resource/jquery-1.9.0.min.js\"></script>\n" + " <script type=\"text/javascript\" src=\"/resource/simple.slide.js\"></script>\n" + " <script type=\"text/javascript\">\n" + " $(function(){\n" + " $(\".pptimage\").simpleSlide();\n" + " });\n" + " </script>\n" + "</head>\n" + "<body>\n" + " ####\n" + "</body>\n" + "</html>");word07转为html
public static void doc07ToHtml(String from, OutputStream out, String imagePath){ try{ Map<String, String> map = new HashMap<String, String>(); //1.如果图片文件夹存在,删除重新创建之 File imagePathFile = new File(imagePath); if(imagePathFile.exists()) { FileUtils.deleteDirectory(imagePathFile); } imagePathFile.mkdirs(); FileInputStream fis = new FileInputStream(from); XWPFDocument doc = new XWPFDocument(fis); XHTMLOptions options = XHTMLOptions.create(); options.setExtractor(new IImageExtractor() { @Override public void extract(String imagePath1, byte[] imageData) throws IOException { //2.处理文件后缀 String suf = ""; if(imagePath1.lastIndexOf(".") > 0) { suf = imagePath1.substring(imagePath1.lastIndexOf("."), imagePath1.length()); } //3.写文件，并将文件对应关系存入map String tempFile = imagePath+File.separator+UuidUtil.getUUID()+suf; File f = new File(tempFile); FileUtils.writeByteArrayToFile(f, imageData); map.put(imagePath1, tempFile); }}); options.setIgnoreStylesIfUnused(false); options.setFragment(true); options.URIResolver(new IURIResolver() { @Override public String resolve(String arg0) { if(map.containsKey(arg0)) { String u = map.get(arg0); if(!XaUtil.isEmpty(u)){ try { u = URLEncoder.encode(u,"ISO-8859-1"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } return "/sys/filemanage/getViewImage.do?id="+u; } return arg0; } }); ByteArrayOutputStream os = new ByteArrayOutputStream(); XHTMLConverter.getInstance().convert(doc, os, options); byte[] datas = os.toByteArray(); os.close(); //处理表格没有边框 String content = new String(datas,"utf-8"); content = ORIGIN_HTML.toString().replaceAll("####",content); datas = content.getBytes("utf-8"); out.write(datas, 0, datas.length); out.flush(); out.close(); }catch(Exception e){ log.error("",e); }}word03转为html
public static void doc03ToHtml(String from, OutputStream out, String imagePath)throws Exception{ try{ //1.如果图片文件夹存在,删除重新创建之 File imagePathFile = new File(imagePath); if(imagePathFile.exists()) { FileUtils.deleteDirectory(imagePathFile); } imagePathFile.mkdirs(); FileInputStream fis = new FileInputStream(from); HWPFDocument doc = new HWPFDocument(fis); WordToHtmlConverter converter = new WordToHtmlConverter(DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument()); converter.setPicturesManager(new PicturesManager() { @Override public String savePicture(byte[] arg0, PictureType arg1, String arg2, float arg3, float arg4) { //2.处理文件后缀 String suf = ""; if(arg2.lastIndexOf(".") > 0) { suf = arg2.substring(arg2.lastIndexOf("."), arg2.length()); } //3.写文件，并将文件对应关系存入map String tempFile = imagePath+File.separator+UuidUtil.getUUID()+suf; File f = new File(tempFile); try { FileUtils.writeByteArrayToFile(f, arg0); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } if(!XaUtil.isEmpty(tempFile)){ try { tempFile = URLEncoder.encode(tempFile,"ISO-8859-1"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } return "/sys/filemanage/getViewImage.do?id="+tempFile; } }); converter.processDocument(doc); Document htmlDocument = converter.getDocument(); ByteArrayOutputStream outStream = new ByteArrayOutputStream(); DOMSource domSource = new DOMSource(htmlDocument); StreamResult streamResult = new StreamResult(outStream); TransformerFactory tf = TransformerFactory.newInstance(); Transformer serializer = tf.newTransformer(); serializer.setOutputProperty(OutputKeys.ENCODING, "utf-8"); serializer.setOutputProperty(OutputKeys.INDENT, "yes"); serializer.setOutputProperty(OutputKeys.METHOD, "html"); serializer.transform(domSource, streamResult); outStream.close(); byte[] datas = outStream.toByteArray(); //处理表格没有边框 String content = new String(datas,"utf-8"); content = ORIGIN_HTML.toString().replaceAll("####",content); datas = content.getBytes("utf-8"); out.write(datas, 0, datas.length); out.flush(); out.close(); }catch(Exception e){ log.error("",e); }}Excel转为html
public static void exceToHtml(String from, OutputStream out){ InputStream in = null; XSSFWorkbook xwb = null; HSSFWorkbook hwb= null; try{ in = new FileInputStream(from); Workbook wb = WorkbookFactory.create(in); if(wb instanceof XSSFWorkbook) { xwb = (XSSFWorkbook) wb; hwb = new HSSFWorkbook(); ConvertXSSF2HSSF c = new ConvertXSSF2HSSF(); c.transformXSSF(xwb, hwb); }else{ hwb = (HSSFWorkbook) wb; } ExcelToHtmlConverter converter = new ExcelToHtmlConverter(DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument()); converter.processWorkbook(hwb); wb.close(); Document htmlDocument = converter.getDocument(); ByteArrayOutputStream outStream = new ByteArrayOutputStream(); DOMSource domSource = new DOMSource (htmlDocument); StreamResult streamResult = new StreamResult (outStream); TransformerFactory tf = TransformerFactory.newInstance(); Transformer serializer = tf.newTransformer(); serializer.setOutputProperty (OutputKeys.ENCODING, "utf-8"); serializer.setOutputProperty (OutputKeys.INDENT, "yes"); serializer.setOutputProperty (OutputKeys.METHOD, "html"); serializer.transform (domSource, streamResult); outStream.close(); String content = new String (outStream.toByteArray(),"utf-8" ); content = ORIGIN_HTML.toString().replaceAll("####",content); byte[] datas = content.getBytes("utf-8"); out.write(datas,0,datas.length); out.flush(); out.close(); }catch (Exception e){ log.error("",e); }finally { try { if(null != in){ in.close(); } if(null != xwb){ xwb.close(); } if(null != hwb){ hwb.close(); } } catch (IOException e) { log.error("",e); } }}ppt07转为图片
public static String ppt07ToImage(String from, String images) { StringBuilder sb = new StringBuilder(); FileInputStream fis = null; XMLSlideShow ppt = null; FileOutputStream fos = null; try { // 1.如果图片文件夹存在,删除重新创建之 File imagePathFile = new File(images); if (imagePathFile.exists()) { FileUtils.deleteDirectory(imagePathFile); } imagePathFile.mkdirs(); fis = new FileInputStream(from); ppt = new XMLSlideShow(fis); Dimension pageSize = ppt.getPageSize(); List<XSLFSlide> slides = ppt.getSlides(); String xmlFontFormat = "<xml-fragment xmlns:a=\"http://schemas.openxmlformats.org/drawingml/2006/main\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\" xmlns:p=\"http://schemas.openxmlformats.org/presentationml/2006/main\">" + "<a:rPr lang=\"zh-CN\" altLang=\"en-US\" dirty=\"0\" smtClean=\"0\"> " + "<a:latin typeface=\"+mj-ea\"/> " + "</a:rPr>" + "</xml-fragment>"; int index = 0; for (XSLFSlide slide : slides) { CTSlide cts = slide.getXmlObject(); CTGroupShape groupShape = cts.getCSld().getSpTree(); List<CTShape> shapeList = groupShape.getSpList(); for (CTShape ctShape : shapeList) { CTTextBody oneCTTextBody = ctShape.getTxBody(); if (null == oneCTTextBody) { continue; } CTTextParagraph[] oneCTTextParagraph = oneCTTextBody.getPArray(); CTTextFont oneCTTextFont = null; oneCTTextFont = CTTextFont.Factory.parse(xmlFontFormat); for (CTTextParagraph ctTextParagraph : oneCTTextParagraph) { CTRegularTextRun[] onrCTRegularTextRunArray = ctTextParagraph.getRArray(); for (CTRegularTextRun ctRegularTextRun : onrCTRegularTextRunArray) { CTTextCharacterProperties oneCTTextCharacterProperties = ctRegularTextRun.getRPr(); oneCTTextCharacterProperties.setLatin(oneCTTextFont); } } } // 创建BufferedImage 对象，图像尺寸为原来的PPT的每页尺寸 BufferedImage oneBufferedImage = new BufferedImage(pageSize.width, pageSize.height, BufferedImage.TYPE_INT_RGB); Graphics2D oneGraphics2D = oneBufferedImage.createGraphics(); // 将PPT文件中的每个页面中的相关内容画到转换后的图片中 slides.get(index).draw(oneGraphics2D); /** * 设置图片的存放路径和图片格式，注意生成的文件路径为绝对路径，最终获得各个图像文件所对应的输出流的对象 */ String imgName = images + File.separator + UuidUtil.getUUID() + ".jpg"; sb.append(imgName + ","); fos = new FileOutputStream(imgName); ImageIO.write(oneBufferedImage, "jpg", fos); index++; } } catch (Exception e) { e.printStackTrace(); }finally { try { if(null != fis) { fis.close(); } if(null != ppt) { ppt.close(); } if(null != fos){ fos.close(); } } catch (IOException e) { e.printStackTrace(); } } return sb.toString();}ppt03转为图片
public static String ppt03ToImage(String from, String images) { StringBuilder sb = new StringBuilder(); FileInputStream fis = null; FileOutputStream fos = null; HSLFSlideShow ppt = null; try { // 1.如果图片文件夹存在,删除重新创建之 File imagePathFile = new File(images); if (imagePathFile.exists()) { FileUtils.deleteDirectory(imagePathFile); } imagePathFile.mkdirs(); fis = new FileInputStream(from); ppt = new HSLFSlideShow(fis); // 获取PPT每页的大小（宽和高度） Dimension onePPTPageSize = ppt.getPageSize(); // 获得PPT文件中的所有的PPT页面（获得每一张幻灯片）,并转为一张张的播放片 List<HSLFSlide> pptPageSlideList = ppt.getSlides(); // 下面循环的主要功能是实现对PPT文件中的每一张幻灯片进行转换和操作 for (int i = 0; i < pptPageSlideList.size(); i++) { // 这几个循环只要是设置字体为宋体，防止中文乱码， List<List<HSLFTextParagraph>> oneTextParagraphs = pptPageSlideList.get(i).getTextParagraphs(); for (List<HSLFTextParagraph> list : oneTextParagraphs) { for (HSLFTextParagraph hslfTextParagraph : list) { List<HSLFTextRun> HSLFTextRunList = hslfTextParagraph.getTextRuns(); for (int j = 0; j < HSLFTextRunList.size(); j++) { /* * 如果PPT在WPS中保存过，则 HSLFTextRunList.get(j).getFontSize();的值为0或者26040， * 因此首先识别当前文本框内的字体尺寸是否为0或者大于26040，则设置默认的字体尺寸。 * */ // 设置字体大小 Double size = HSLFTextRunList.get(j).getFontSize(); if ((size <= 0) || (size >= 26040)) { HSLFTextRunList.get(j).setFontSize(20.0); } // 设置字体样式为宋体 // String family=HSLFTextRunList.get(j).getFontFamily(); // HSLFTextRunList.get(j).setFontFamily("宋体"); int index = HSLFTextRunList.get(j).getFontIndex(); String name = HSLFTextRunList.get(j).getFontFamily(); HSLFTextRunList.get(j).setFontIndex(1); HSLFTextRunList.get(j).setFontFamily("宋体"); log.info("ppt info:"+HSLFTextRunList.get(j).getRawText()); } } } /** * 创建BufferedImage对象，图像的尺寸为原来的每页的尺寸 */ BufferedImage oneBufferedImage = new BufferedImage(onePPTPageSize.width, onePPTPageSize.height, BufferedImage.TYPE_INT_RGB); Graphics2D oneGraphics2D = oneBufferedImage.createGraphics(); /** * 设置转换后的图片背景色为白色 * */ oneGraphics2D.setPaint(Color.white); oneGraphics2D.fill(new Rectangle2D.Float(0, 0, onePPTPageSize.width, onePPTPageSize.height)); pptPageSlideList.get(i).draw(oneGraphics2D); /** * 设置图片的存放路径和图片格式 */ String imgName = images + File.separator + UuidUtil.getUUID() + ".jpg"; sb.append(imgName); sb.append(","); fos = new FileOutputStream(imgName); /** * 图片文件保存的指定的目录中 */ ImageIO.write(oneBufferedImage, "jpg", fos); } } catch (Exception e) { e.printStackTrace(); } finally { try { if(null != fis) { fis.close(); } if(null != ppt) { ppt.close(); } if(null != fos){ fos.close(); } } catch (IOException e) { e.printStackTrace(); } } return sb.toString();}（完）
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