在线预览文档简单例子

程序员文章站 2022-07-13 15:22:58

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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）

在线预览文档简单例子

maven依赖

预览pdf

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word07转为html

word03转为html

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ppt07转为图片

ppt03转为图片

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在线预览文档简单例子

maven依赖

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预览页面

word07转为html

word03转为html

Excel转为html

ppt07转为图片

ppt03转为图片

ASP.NET Core 2.0集成Office Online Server（OWAS）实现办公文档的在线预览与编辑（支持word\excel\ppt\pdf等格式）

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vue插件开发之使用pdf.js实现手机端在线预览pdf文档

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