在线预览文档简单例子

我就是我 2022-06-02 23:58 410阅读 0赞

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）