、前言

實(shí)現(xiàn)文檔在線預(yù)覽的方式除了上篇文章 文檔在線預(yù)覽新版（一）通過(guò)將文件轉(zhuǎn)成圖片實(shí)現(xiàn)在線預(yù)覽功能說(shuō)的將文檔轉(zhuǎn)成圖片的實(shí)現(xiàn)方式外，還有轉(zhuǎn)成pdf，前端通過(guò)pdf.js、pdfobject.js等插件來(lái)實(shí)現(xiàn)在線預(yù)覽，以及本文將要說(shuō)到的將文檔轉(zhuǎn)成html的方式來(lái)實(shí)現(xiàn)在線預(yù)覽。

以下代碼分別提供基于aspose、pdfbox、spire來(lái)實(shí)現(xiàn)來(lái)實(shí)現(xiàn)txt、word、pdf、ppt、word等文件轉(zhuǎn)圖片的需求。

1、aspose

Aspose 是一家致力于.Net ,Java,SharePoint,JasperReports和SSRS組件的提供商，數(shù)十個(gè)國(guó)家的數(shù)千機(jī)構(gòu)都有用過(guò)aspose組件，創(chuàng)建、編輯、轉(zhuǎn)換或渲染 Office、OpenOffice、PDF、圖像、ZIP、CAD、XPS、EPS、PSD 和更多文件格式。注意aspose是商用組件，未經(jīng)授權(quán)導(dǎo)出文件里面都是是水印（尊重版權(quán)，遠(yuǎn)離破解版）。

需要在項(xiàng)目的pom文件里添加如下依賴(lài)

        <dependency>
            <groupId>com.aspose</groupId>
            <artifactId>aspose-words</artifactId>
            <version>23.1</version>
        </dependency>
        <dependency>
            <groupId>com.aspose</groupId>
            <artifactId>aspose-pdf</artifactId>
            <version>23.1</version>
        </dependency>
        <dependency>
            <groupId>com.aspose</groupId>
            <artifactId>aspose-cells</artifactId>
            <version>23.1</version>
        </dependency>
        <dependency>
            <groupId>com.aspose</groupId>
            <artifactId>aspose-slides</artifactId>
            <version>23.1</version>
        </dependency>

2 、poi + pdfbox

因?yàn)閍spose和spire雖然好用，但是都是是商用組件，所以這里也提供使用開(kāi)源庫(kù)操作的方式的方式。

POI是Apache軟件基金會(huì)用Java編寫(xiě)的免費(fèi)開(kāi)源的跨平臺(tái)的 Java API，Apache POI提供API給Java程序?qū)icrosoft Office格式檔案讀和寫(xiě)的功能。

Apache PDFBox是一個(gè)開(kāi)源Java庫(kù)，支持PDF文檔的開(kāi)發(fā)和轉(zhuǎn)換。 使用此庫(kù)，您可以開(kāi)發(fā)用于創(chuàng)建，轉(zhuǎn)換和操作PDF文檔的Java程序。

需要在項(xiàng)目的pom文件里添加如下依賴(lài)

		<dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>2.0.4</version>
        </dependency>
		<dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>5.2.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>5.2.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-scratchpad</artifactId>
            <version>5.2.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-excelant</artifactId>
            <version>5.2.0</version>
        </dependency>

3 spire

spire一款專(zhuān)業(yè)的Office編程組件，涵蓋了對(duì)Word、Excel、PPT、PDF等文件的讀寫(xiě)、編輯、查看功能。spire提供免費(fèi)版本，但是存在只能導(dǎo)出前3頁(yè)以及只能導(dǎo)出前500行的限制，只要達(dá)到其一就會(huì)觸發(fā)限制。需要超出前3頁(yè)以及只能導(dǎo)出前500行的限制的這需要購(gòu)買(mǎi)付費(fèi)版（尊重版權(quán)，遠(yuǎn)離破解版）。這里使用免費(fèi)版進(jìn)行演示。

spire在添加pom之前還得先添加maven倉(cāng)庫(kù)來(lái)源

		<repository>
            <id>com.e-iceblue</id>
            <name>e-iceblue</name>
            <url>https://repo.e-iceblue.cn/repository/maven-public/</url>
        </repository>

接著在項(xiàng)目的pom文件里添加如下依賴(lài)

免費(fèi)版：

		<dependency>
            <groupId>e-iceblue</groupId>
            <artifactId>spire.office.free</artifactId>
            <version>5.3.1</version>
        </dependency>

付費(fèi)版版：

		<dependency>
            <groupId>e-iceblue</groupId>
            <artifactId>spire.office</artifactId>
            <version>5.3.1</version>
        </dependency>

二、將文件轉(zhuǎn)換成html字符串

1、將word文件轉(zhuǎn)成html字符串

1.1 使用aspose

public static String wordToHtmlStr(String wordPath) {
        try {
            Document doc = new Document(wordPath); // Address是將要被轉(zhuǎn)化的word文檔
            String htmlStr = doc.toString();
            return htmlStr;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

驗(yàn)證結(jié)果：

1.2 使用poi

public String wordToHtmlStr(String wordPath) throws TransformerException, IOException, ParserConfigurationException {
        String htmlStr = null;
        String ext = wordPath.substring(wordPath.lastIndexOf("."));
        if (ext.equals(".docx")) {
            htmlStr = word2007ToHtmlStr(wordPath);
        } else if (ext.equals(".doc")){
            htmlStr = word2003ToHtmlStr(wordPath);
        } else {
            throw new RuntimeException("文件格式不正確");
        }
        return htmlStr;
    }

    public String word2007ToHtmlStr(String wordPath) throws IOException {
        // 使用內(nèi)存輸出流
        try(ByteArrayOutputStream out = new ByteArrayOutputStream()){
            word2007ToHtmlOutputStream(wordPath, out);
            return out.toString();
        }
    }

    private void word2007ToHtmlOutputStream(String wordPath,OutputStream out) throws IOException {
        ZipSecureFile.setMinInflateRatio(-1.0d);
        InputStream in = Files.newInputStream(Paths.get(wordPath));
        XWPFDocument document = new XWPFDocument(in);
        XHTMLOptions options = XHTMLOptions.create().setIgnoreStylesIfUnused(false).setImageManager(new Base64EmbedImgManager());
        // 使用內(nèi)存輸出流
        XHTMLConverter.getInstance().convert(document, out, options);
    }


    private String word2003ToHtmlStr(String wordPath) throws TransformerException, IOException, ParserConfigurationException {
        org.w3c.dom.Document htmlDocument = word2003ToHtmlDocument(wordPath);
        // Transform document to string
        StringWriter writer = new StringWriter();
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.newTransformer();
        transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
        transformer.setOutputProperty(OutputKeys.METHOD, "html");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.transform(new DOMSource(htmlDocument), new StreamResult(writer));
        return writer.toString();
    }

private org.w3c.dom.Document word2003ToHtmlDocument(String wordPath) throws IOException, ParserConfigurationException {
        InputStream input = Files.newInputStream(Paths.get(wordPath));
        HWPFDocument wordDocument = new HWPFDocument(input);
        WordToHtmlConverter wordToHtmlConverter = new WordToHtmlConverter(
                DocumentBuilderFactory.newInstance().newDocumentBuilder()
                        .newDocument());
        wordToHtmlConverter.setPicturesManager((content, pictureType, suggestedName, widthInches, heightInches) -> {
            System.out.println(pictureType);
            if (PictureType.UNKNOWN.equals(pictureType)) {
                return null;
            }
            BufferedImage bufferedImage = ImgUtil.toImage(content);
            String base64Img = ImgUtil.toBase64(bufferedImage, pictureType.getExtension());
            //  帶圖片的word，則將圖片轉(zhuǎn)為base64編碼，保存在一個(gè)頁(yè)面中
            StringBuilder sb = (new StringBuilder(base64Img.length() + "data:;base64,".length()).append("data:;base64,").append(base64Img));
            return sb.toString();
        });
        // 解析word文檔
        wordToHtmlConverter.processDocument(wordDocument);
        return wordToHtmlConverter.getDocument();
    }

1.3 使用spire

 public String wordToHtmlStr(String wordPath) throws IOException {
        try(ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
            Document document = new Document();
            document.loadFromFile(wordPath);
            document.saveToFile(outputStream, FileFormat.Html);
            return outputStream.toString();
        }
    }

2、將pdf文件轉(zhuǎn)成html字符串

2.1 使用aspose

public static String pdfToHtmlStr(String pdfPath) throws IOException, ParserConfigurationException {
        PDDocument document = PDDocument.load(new File(pdfPath));
        Writer writer = new StringWriter();
        new PDFDomTree().writeText(document, writer);
        writer.close();
        document.close();
        return writer.toString();
    }

驗(yàn)證結(jié)果：

2.2 使用 poi + pbfbox

public String pdfToHtmlStr(String pdfPath) throws IOException, ParserConfigurationException {
        PDDocument document = PDDocument.load(new File(pdfPath));
        Writer writer = new StringWriter();
        new PDFDomTree().writeText(document, writer);
        writer.close();
        document.close();
        return writer.toString();
    }

2.3 使用spire

public String pdfToHtmlStr(String pdfPath) throws IOException, ParserConfigurationException {
        try(ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
            PdfDocument pdf = new PdfDocument();
            pdf.loadFromFile(pdfPath);
            return outputStream.toString();
        }
    }

3、將excel文件轉(zhuǎn)成html字符串

3.1 使用aspose

public static String excelToHtmlStr(String excelPath) throws Exception {
        FileInputStream fileInputStream = new FileInputStream(excelPath);
        Workbook workbook = new XSSFWorkbook(fileInputStream);
        DataFormatter dataFormatter = new DataFormatter();
        FormulaEvaluator formulaEvaluator = workbook.getCreationHelper().createFormulaEvaluator();
        Sheet sheet = workbook.getSheetAt(0);
        StringBuilder htmlStringBuilder = new StringBuilder();
        htmlStringBuilder.append("<html><head><title>Excel to HTML using Java and POI library</title>");
        htmlStringBuilder.append("<style>table, th, td { border: 1px solid black; }</style>");
        htmlStringBuilder.append("</head><body><table>");
        for (Row row : sheet) {
            htmlStringBuilder.append("<tr>");
            for (Cell cell : row) {
                CellType cellType = cell.getCellType();
                if (cellType == CellType.FORMULA) {
                    formulaEvaluator.evaluateFormulaCell(cell);
                    cellType = cell.getCachedFormulaResultType();
                }
                String cellValue = dataFormatter.formatCellValue(cell, formulaEvaluator);
                htmlStringBuilder.append("<td>").append(cellValue).append("</td>");
            }
            htmlStringBuilder.append("</tr>");
        }
        htmlStringBuilder.append("</table></body></html>");
        return htmlStringBuilder.toString();
    }

返回的html字符串：

<html><head><title>Excel to HTML using Java and POI library</title><style>table, th, td { border: 1px solid black; }</style></head><body><table><tr><td>序號(hào)</td><td>姓名</td><td>性別</td><td>聯(lián)系方式</td><td>地址</td></tr><tr><td>1</td><td>張曉玲</td><td>女</td><td>11111111111</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>2</td><td>王小二</td><td>男</td><td>1222222</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>1</td><td>張曉玲</td><td>女</td><td>11111111111</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>2</td><td>王小二</td><td>男</td><td>1222222</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>1</td><td>張曉玲</td><td>女</td><td>11111111111</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>2</td><td>王小二</td><td>男</td><td>1222222</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>1</td><td>張曉玲</td><td>女</td><td>11111111111</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>2</td><td>王小二</td><td>男</td><td>1222222</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>1</td><td>張曉玲</td><td>女</td><td>11111111111</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>2</td><td>王小二</td><td>男</td><td>1222222</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>1</td><td>張曉玲</td><td>女</td><td>11111111111</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>2</td><td>王小二</td><td>男</td><td>1222222</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>1</td><td>張曉玲</td><td>女</td><td>11111111111</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr><tr><td>2</td><td>王小二</td><td>男</td><td>1222222</td><td>上海市浦東新區(qū)xx路xx弄xx號(hào)</td></tr></table></body></html>

3.2 使用poi + pdfbox

public String excelToHtmlStr(String excelPath) throws Exception {
        FileInputStream fileInputStream = new FileInputStream(excelPath);
        try (Workbook workbook = WorkbookFactory.create(new File(excelPath))){
            DataFormatter dataFormatter = new DataFormatter();
            FormulaEvaluator formulaEvaluator = workbook.getCreationHelper().createFormulaEvaluator();
            org.apache.poi.ss.usermodel.Sheet sheet = workbook.getSheetAt(0);
            StringBuilder htmlStringBuilder = new StringBuilder();
            htmlStringBuilder.append("<html><head><title>Excel to HTML using Java and POI library</title>");
            htmlStringBuilder.append("<style>table, th, td { border: 1px solid black; }</style>");
            htmlStringBuilder.append("</head><body><table>");
            for (Row row : sheet) {
                htmlStringBuilder.append("<tr>");
                for (Cell cell : row) {
                    CellType cellType = cell.getCellType();
                    if (cellType == CellType.FORMULA) {
                        formulaEvaluator.evaluateFormulaCell(cell);
                        cellType = cell.getCachedFormulaResultType();
                    }
                    String cellValue = dataFormatter.formatCellValue(cell, formulaEvaluator);
                    htmlStringBuilder.append("<td>").append(cellValue).append("</td>");
                }
                htmlStringBuilder.append("</tr>");
            }
            htmlStringBuilder.append("</table></body></html>");
            return htmlStringBuilder.toString();
        }
    }

3.3 使用spire

public String excelToHtmlStr(String excelPath) throws Exception {
        try(ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
            Workbook workbook = new Workbook();
            workbook.loadFromFile(excelPath);
            workbook.saveToStream(outputStream, com.spire.xls.FileFormat.HTML);
            return outputStream.toString();
        }
    }

三、將文件轉(zhuǎn)換成html，并生成html文件

有時(shí)我們是需要的不僅僅返回html字符串，而是需要生成一個(gè)html文件這時(shí)應(yīng)該怎么做呢？一個(gè)改動(dòng)量小的做法就是使用org.apache.commons.io包下的FileUtils工具類(lèi)寫(xiě)入目標(biāo)地址：

FileUtils類(lèi)將html字符串生成html文件示例：

首先需要引入pom：

		<dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.8.0</version>
        </dependency>

相關(guān)代碼：

String htmlStr = FileConvertUtil.pdfToHtmlStr("D:\\書(shū)籍\\電子書(shū)\\小說(shuō)\\歷史小說(shuō)\\最后的可汗.doc");
FileUtils.write(new File("D:\\test\\doc.html"), htmlStr, "utf-8");

除此之外，還可以對(duì)上面的代碼進(jìn)行一些調(diào)整，已實(shí)現(xiàn)生成html文件，代碼調(diào)整如下：

1、將word文件轉(zhuǎn)換成html文件

word原文件效果：

1.1 使用aspose

public static void wordToHtml(String wordPath, String htmlPath) {
        try {
            File sourceFile = new File(wordPath);
            String path = htmlPath + File.separator + sourceFile.getName().substring(0, sourceFile.getName().lastIndexOf(".")) + ".html";
            File file = new File(path); // 新建一個(gè)空白pdf文檔
            FileOutputStream os = new FileOutputStream(file);
            Document doc = new Document(wordPath); // Address是將要被轉(zhuǎn)化的word文檔
            HtmlSaveOptions options = new HtmlSaveOptions();
            options.setExportImagesAsBase64(true);
            options.setExportRelativeFontSize(true);
            doc.save(os, options);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

轉(zhuǎn)換成html的效果：

1.2 使用poi + pdfbox

public void wordToHtml(String wordPath, String htmlPath) throws TransformerException, IOException, ParserConfigurationException {
        htmlPath = FileUtil.getNewFileFullPath(wordPath, htmlPath, "html");
        String ext = wordPath.substring(wordPath.lastIndexOf("."));
        if (ext.equals(".docx")) {
            word2007ToHtml(wordPath, htmlPath);
        } else if (ext.equals(".doc")){
            word2003ToHtml(wordPath, htmlPath);
        } else {
            throw new RuntimeException("文件格式不正確");
        }
    }

    public void word2007ToHtml(String wordPath, String htmlPath) throws TransformerException, IOException, ParserConfigurationException {
        //try(OutputStream out = Files.newOutputStream(Paths.get(path))){
        try(FileOutputStream out = new FileOutputStream(htmlPath)){
            word2007ToHtmlOutputStream(wordPath, out);
        }
    }

    private void word2007ToHtmlOutputStream(String wordPath,OutputStream out) throws IOException {
        ZipSecureFile.setMinInflateRatio(-1.0d);
        InputStream in = Files.newInputStream(Paths.get(wordPath));
        XWPFDocument document = new XWPFDocument(in);
        XHTMLOptions options = XHTMLOptions.create().setIgnoreStylesIfUnused(false).setImageManager(new Base64EmbedImgManager());
        // 使用內(nèi)存輸出流
        XHTMLConverter.getInstance().convert(document, out, options);
    }

    public void word2003ToHtml(String wordPath, String htmlPath) throws TransformerException, IOException, ParserConfigurationException {
        org.w3c.dom.Document htmlDocument = word2003ToHtmlDocument(wordPath);
        // 生成html文件地址

        try(OutputStream outStream = Files.newOutputStream(Paths.get(htmlPath))){
            DOMSource domSource = new DOMSource(htmlDocument);
            StreamResult streamResult = new StreamResult(outStream);
            TransformerFactory factory = TransformerFactory.newInstance();
            Transformer serializer = factory.newTransformer();
            serializer.setOutputProperty(OutputKeys.ENCODING, "utf-8");
            serializer.setOutputProperty(OutputKeys.INDENT, "yes");
            serializer.setOutputProperty(OutputKeys.METHOD, "html");
            serializer.transform(domSource, streamResult);
        }
    }

    private org.w3c.dom.Document word2003ToHtmlDocument(String wordPath) throws IOException, ParserConfigurationException {
        InputStream input = Files.newInputStream(Paths.get(wordPath));
        HWPFDocument wordDocument = new HWPFDocument(input);
        WordToHtmlConverter wordToHtmlConverter = new WordToHtmlConverter(
                DocumentBuilderFactory.newInstance().newDocumentBuilder()
                        .newDocument());
        wordToHtmlConverter.setPicturesManager((content, pictureType, suggestedName, widthInches, heightInches) -> {
            System.out.println(pictureType);
            if (PictureType.UNKNOWN.equals(pictureType)) {
                return null;
            }
            BufferedImage bufferedImage = ImgUtil.toImage(content);
            String base64Img = ImgUtil.toBase64(bufferedImage, pictureType.getExtension());
            //  帶圖片的word，則將圖片轉(zhuǎn)為base64編碼，保存在一個(gè)頁(yè)面中
            StringBuilder sb = (new StringBuilder(base64Img.length() + "data:;base64,".length()).append("data:;base64,").append(base64Img));
            return sb.toString();
        });
        // 解析word文檔
        wordToHtmlConverter.processDocument(wordDocument);
        return wordToHtmlConverter.getDocument();
    }

轉(zhuǎn)換成html的效果：

1.3 使用spire

public void wordToHtml(String wordPath, String htmlPath) {
        htmlPath = FileUtil.getNewFileFullPath(wordPath, htmlPath, "html");
        Document document = new Document();
        document.loadFromFile(wordPath);
        document.saveToFile(htmlPath, FileFormat.Html);
    }

轉(zhuǎn)換成html的效果：

因?yàn)槭褂玫氖敲赓M(fèi)版，存在頁(yè)數(shù)和字?jǐn)?shù)限制，需要完整功能的的可以選擇付費(fèi)版本。PS：這回76頁(yè)的文檔居然轉(zhuǎn)成功了前50頁(yè)。

2、將pdf文件轉(zhuǎn)換成html文件

圖片版pdf原文件效果：

文字版pdf原文件效果：

2.1 使用aspose

public static void pdfToHtml(String pdfPath, String htmlPath) throws IOException, ParserConfigurationException {
        File file = new File(pdfPath);
        String path = htmlPath + File.separator + file.getName().substring(0, file.getName().lastIndexOf(".")) + ".html";
        PDDocument document = PDDocument.load(new File(pdfPath));
        Writer writer = new PrintWriter(path, "UTF-8");
        new PDFDomTree().writeText(document, writer);
        writer.close();
        document.close();
    }

圖片版PDF文件驗(yàn)證結(jié)果：

文字版PDF文件驗(yàn)證結(jié)果：

2.2 使用poi + pdfbox

public void pdfToHtml(String pdfPath, String htmlPath) throws IOException, ParserConfigurationException {
        String path = FileUtil.getNewFileFullPath(pdfPath, htmlPath, "html");
        PDDocument document = PDDocument.load(new File(pdfPath));
        Writer writer = new PrintWriter(path, "UTF-8");
        new PDFDomTree().writeText(document, writer);
        writer.close();
        document.close();
    }

圖片版PDF文件驗(yàn)證結(jié)果：

文字版PDF原文件效果：

2.3 使用spire

public void pdfToHtml(String pdfPath, String htmlPath) throws IOException, ParserConfigurationException {
        htmlPath = FileUtil.getNewFileFullPath(pdfPath, htmlPath, "html");
        PdfDocument pdf = new PdfDocument();
        pdf.loadFromFile(pdfPath);
        pdf.saveToFile(htmlPath, com.spire.pdf.FileFormat.HTML);
    }

圖片版PDF文件驗(yàn)證結(jié)果：
因?yàn)槭褂玫氖敲赓M(fèi)版，所以只有前三頁(yè)是正常的。。。有超過(guò)三頁(yè)需求的可以選擇付費(fèi)版本。

文字版PDF原文件效果：

報(bào)錯(cuò)了無(wú)法轉(zhuǎn)換。。。

java.lang.NullPointerException
	at com.spire.pdf.PdfPageWidget.spr┢?(Unknown Source)
	at com.spire.pdf.PdfPageWidget.getSize(Unknown Source)
	at com.spire.pdf.PdfPageBase.spr???—(Unknown Source)
	at com.spire.pdf.PdfPageBase.getActualSize(Unknown Source)
	at com.spire.pdf.PdfPageBase.getSection(Unknown Source)
	at com.spire.pdf.general.PdfDestination.spr︻┎?—(Unknown Source)
	at com.spire.pdf.general.PdfDestination.spr┻┑?—(Unknown Source)
	at com.spire.pdf.general.PdfDestination.getElement(Unknown Source)
	at com.spire.pdf.primitives.PdfDictionary.setProperty(Unknown Source)
	at com.spire.pdf.bookmarks.PdfBookmark.setDestination(Unknown Source)
	at com.spire.pdf.bookmarks.PdfBookmarkWidget.spr┭┘?—(Unknown Source)
	at com.spire.pdf.bookmarks.PdfBookmarkWidget.getDestination(Unknown Source)
	at com.spire.pdf.PdfDocumentBase.spr??(Unknown Source)
	at com.spire.pdf.widget.PdfPageCollection.spr┦?(Unknown Source)
	at com.spire.pdf.widget.PdfPageCollection.removeAt(Unknown Source)
	at com.spire.pdf.PdfDocumentBase.spr┞?(Unknown Source)
	at com.spire.pdf.PdfDocument.loadFromFile(Unknown Source)

3、將excel文件轉(zhuǎn)換成html文件

excel原文件效果：

3.1 使用aspose

public void excelToHtml(String excelPath, String htmlPath) throws Exception {
        htmlPath = FileUtil.getNewFileFullPath(excelPath, htmlPath, "html");
        Workbook workbook = new Workbook(excelPath);
        com.aspose.cells.HtmlSaveOptions options = new com.aspose.cells.HtmlSaveOptions();
        workbook.save(htmlPath, options);
    }

轉(zhuǎn)換成html的效果：

3.2 使用poi

public void excelToHtml(String excelPath, String htmlPath) throws Exception {
        String path = FileUtil.getNewFileFullPath(excelPath, htmlPath, "html");
        try(FileOutputStream fileOutputStream = new FileOutputStream(path)){
            String htmlStr = excelToHtmlStr(excelPath);
            byte[] bytes = htmlStr.getBytes();
            fileOutputStream.write(bytes);
        }
    }


    public String excelToHtmlStr(String excelPath) throws Exception {
        FileInputStream fileInputStream = new FileInputStream(excelPath);
        try (Workbook workbook = WorkbookFactory.create(new File(excelPath))){
            DataFormatter dataFormatter = new DataFormatter();
            FormulaEvaluator formulaEvaluator = workbook.getCreationHelper().createFormulaEvaluator();
            org.apache.poi.ss.usermodel.Sheet sheet = workbook.getSheetAt(0);
            StringBuilder htmlStringBuilder = new StringBuilder();
            htmlStringBuilder.append("<html><head><title>Excel to HTML using Java and POI library</title>");
            htmlStringBuilder.append("<style>table, th, td { border: 1px solid black; }</style>");
            htmlStringBuilder.append("</head><body><table>");
            for (Row row : sheet) {
                htmlStringBuilder.append("<tr>");
                for (Cell cell : row) {
                    CellType cellType = cell.getCellType();
                    if (cellType == CellType.FORMULA) {
                        formulaEvaluator.evaluateFormulaCell(cell);
                        cellType = cell.getCachedFormulaResultType();
                    }
                    String cellValue = dataFormatter.formatCellValue(cell, formulaEvaluator);
                    htmlStringBuilder.append("<td>").append(cellValue).append("</td>");
                }
                htmlStringBuilder.append("</tr>");
            }
            htmlStringBuilder.append("</table></body></html>");
            return htmlStringBuilder.toString();
        }
    }

轉(zhuǎn)換成html的效果：

3.3 使用spire

public void excelToHtml(String excelPath, String htmlPath) throws Exception {
        htmlPath = FileUtil.getNewFileFullPath(excelPath, htmlPath, "html");
        Workbook workbook = new Workbook();
        workbook.loadFromFile(excelPath);
        workbook.saveToFile(htmlPath, com.spire.xls.FileFormat.HTML);
    }

轉(zhuǎn)換成html的效果：

四、總結(jié)

從上述的效果展示我們可以發(fā)現(xiàn)其實(shí)轉(zhuǎn)成html效果不是太理想，很多細(xì)節(jié)樣式?jīng)]有還原，這其實(shí)是因?yàn)檫@類(lèi)轉(zhuǎn)換往往都是追求目標(biāo)是通過(guò)使用文檔中的語(yǔ)義信息并忽略其他細(xì)節(jié)來(lái)生成簡(jiǎn)單干凈的 HTML，所以在轉(zhuǎn)換過(guò)程中復(fù)雜樣式被忽略，比如居中、首行縮進(jìn)、字體，文本大小，顏色。舉個(gè)例子在轉(zhuǎn)換是 會(huì)將應(yīng)用標(biāo)題 1 樣式的任何段落轉(zhuǎn)換為 h1 元素，而不是嘗試完全復(fù)制標(biāo)題的樣式。所以轉(zhuǎn)成html的顯示效果往往和原文檔不太一樣。這意味著對(duì)于較復(fù)雜的文檔而言，這種轉(zhuǎn)換不太可能是完美的。但如果都是只使用簡(jiǎn)單樣式文檔或者對(duì)文檔樣式不太關(guān)心的這種方式也不妨一試。

PS：如果想要展示效果好的話，其實(shí)可以將上篇文章《文檔在線預(yù)覽（一）通過(guò)將txt、word、pdf轉(zhuǎn)成圖片實(shí)現(xiàn)在線預(yù)覽功能》說(shuō)的內(nèi)容和本文結(jié)合起來(lái)使用，即將文檔里的內(nèi)容都生成成圖片（很可能是多張圖片），然后將生成的圖片全都放到一個(gè)html頁(yè)面里 ，用html+css來(lái)保持樣式并實(shí)現(xiàn)多張圖片展示，再將html返回。開(kāi)源組件kkfilevie就是用的就是這種做法。

kkfileview展示效果如下：

下圖是kkfileview返回的html代碼，從html代碼我們可以看到kkfileview其實(shí)是將文件（txt文件除外）每頁(yè)的內(nèi)容都轉(zhuǎn)成了圖片，然后將這些圖片都嵌入到一個(gè)html里，再返回給用戶一個(gè)html頁(yè)面。