方式一、pdf文件理論上可以在瀏覽器直接打開預覽但是需要打開新頁面。在僅僅是預覽pdf文件且UI要求不高的情況下可以直接通過a標簽href屬性實現預覽
<a href="文檔地址"></a>
方式二、通過jquery插件jquery.media.js實現 這個插件可以實現pdf預覽功能(包括其他各種媒體文件)但是對word等類型的文件無能為力。 實現方式: js代碼:
<script type="text/javascript" src="jquery-1.7.1.min.js"></script> <script type="text/javascript" src="jquery.media.js"></script> 復制代碼
html結構:
<body> <div id="handout_wrap_inner"></div> </body> 復制代碼
調用方式:
<script type="text/javascript"> $('#handout_wrap_inner').media({ width: '100%', height: '100%', autoplay: true, src:'http://storage.xuetangx.com/public_assets/xuetangx/PDF/PlayerAPI_v1.0.6.pdf', }); </script> 復制代碼
方式三、直接通過頁面內嵌iframe
$("<iframe src='"+ this.previewUrl +"' width='100%' height='362px' frameborder='1'>").appendTo($(".video-handouts-preview")); 復制代碼
此外還可以在iframe標簽之間提供一個提示類似這樣
<iframe :src="previewUrl" width="100%" height="100%"> This browser does not support PDFs. Please download the PDF to view it: <a :href="previewUrl">Download PDF</a> </iframe> 復制代碼
方式四、通過標簽嵌入內容
<embed :src="previewUrl" type="application/pdf" width="100%" height="100%">
此標簽h5特性中包含四個屬性:高、寬、類型、預覽文件src! 與< iframe > < / iframe > 不同,這個標簽是自閉合的的,也就是說如果瀏覽器不支持PDF的嵌入,那么這個標簽的內容什么都看不到!
方式五、標簽和iframe使用差別較小
<object :src="previewUrl" width="100%" height="100%"> This browser does not support PDFs. Please download the PDF to view it: <a :href="previewUrl">Download PDF</a> </object> 復制代碼
除方式二以外其他都是直接通過標簽將內容引入頁面實現預覽
方式六、PDFObject
PDFObject實際上也是通過標簽實現的直接上代碼
<!DOCTYPE html> <html> <head> <title>Show PDF</title> <meta charset="utf-8" /> <script type="text/javascript" src='pdfobject.min.js'></script> <style type="text/css"> html,body,#pdf_viewer{ width: 100%; height: 100%; margin: 0; padding: 0; } </style> </head> <body> <div id="pdf_viewer"></div> </body> <script type="text/javascript"> if(PDFObject.supportsPDFs){ // PDF嵌入到網頁 PDFObject.embed("index.pdf", "#pdf_viewer" ); } else { location.href = "/canvas"; } </script> </html>
還可以通過以下代碼進行判斷是否支持PDFObject預覽
if(PDFObject.supportsPDFs){ console.log("Yay, this browser supports inline PDFs."); } else { console.log("Boo, inline PDFs are not supported by this browser"); } 復制代碼
方式七、PDF.js
PDF.js可以實現在html下直接瀏覽pdf文檔,是一款開源的pdf文檔讀取解析插件,非常強大,能將PDF文件渲染成Canvas。PDF.js主要包含兩個庫文件,一個pdf.js和一個pdf.worker.js,一個負責API解析,一個負責核心解析。
word、ppt、xls文件實現在線預覽的方式比較簡單可以直接通過調用微軟的在線預覽功能實現 (預覽前提:資源必須是公共可訪問的)
<iframe src='https://view.officeapps.live.com/op/view.aspx?src=http://storage.xuetangx.com/public_assets/xuetangx/PDF/1.xls' width='100%' height='100%' frameborder='1'> </iframe> 復制代碼
src就是要實現預覽的文件地址 具體文檔看這微軟接口文檔
補充:google的文檔在線預覽實現同微軟(資源必須是公共可訪問的)
<iframe :src="'https://docs.google.com/viewer?url="fileurl"></iframe> 復制代碼
3、word文件
XDOC可以實現預覽以DataURI表示的DOC文檔,此外XDOC還可以實現文本、帶參數文本、html文本、json文本、公文等在線預覽,具體實現方法請看官方文檔
下面這種方式可以實現快速預覽word但是對文件使用的編輯器可能會有一些限制
<a target="_blank" rel="nofollow">XDOC</a> 復制代碼
4、excel文件
目前excel文件已經有了類似pdf.js那樣的解析sheet.js
總結:
1、免費純前端方式實現在線預覽word、excel、ppt最優選擇微軟在線預覽(不可編輯)
2、利用后端將文件轉為圖片,前端以圖片形式預覽(可行方案)
3、購買在線預覽服務例如百度DOC文檔服務、永中、I DOC VIEW等
著名:文章內容是從網上搜集資料所得;在次發表只為自己以及頭條程序員兄弟日后使用圖個方便。
覺得有用記得收藏轉發!
者:子木 政采云前端團隊
轉發鏈接:https://mp.weixin.qq.com/s/Wx_gJLrZftJ_dm2phoUf8g
實現文檔在線預覽的方式除了上篇文章 文檔在線預覽新版(一)通過將文件轉成圖片實現在線預覽功能說的將文檔轉成圖片的實現方式外,還有轉成pdf,前端通過pdf.js、pdfobject.js等插件來實現在線預覽,以及本文將要說到的將文檔轉成html的方式來實現在線預覽。
以下代碼分別提供基于aspose、pdfbox、spire來實現來實現txt、word、pdf、ppt、word等文件轉圖片的需求。
Aspose 是一家致力于.Net ,Java,SharePoint,JasperReports和SSRS組件的提供商,數十個國家的數千機構都有用過aspose組件,創建、編輯、轉換或渲染 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,未經授權導出文件里面都是是水印(尊重版權,遠離破解版)。
需要在項目的pom文件里添加如下依賴
<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>
因為aspose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源庫操作的方式的方式。
POI是Apache軟件基金會用Java編寫的免費開源的跨平臺的 Java API,Apache POI提供API給Java程序對Microsoft Office格式檔案讀和寫的功能。
Apache PDFBox是一個開源Java庫,支持PDF文檔的開發和轉換。 使用此庫,您可以開發用于創建,轉換和操作PDF文檔的Java程序。
需要在項目的pom文件里添加如下依賴
<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>
spire一款專業的Office編程組件,涵蓋了對Word、Excel、PPT、PDF等文件的讀寫、編輯、查看功能。spire提供免費版本,但是存在只能導出前3頁以及只能導出前500行的限制,只要達到其一就會觸發限制。需要超出前3頁以及只能導出前500行的限制的這需要購買付費版(尊重版權,遠離破解版)。這里使用免費版進行演示。
spire在添加pom之前還得先添加maven倉庫來源
<repository>
<id>com.e-iceblue</id>
<name>e-iceblue</name>
<url>https://repo.e-iceblue.cn/repository/maven-public/</url>
</repository>
接著在項目的pom文件里添加如下依賴
免費版:
<dependency>
<groupId>e-iceblue</groupId>
<artifactId>spire.office.free</artifactId>
<version>5.3.1</version>
</dependency>
付費版版:
<dependency>
<groupId>e-iceblue</groupId>
<artifactId>spire.office</artifactId>
<version>5.3.1</version>
</dependency>
public static String wordToHtmlStr(String wordPath) {
try {
Document doc = new Document(wordPath); // Address是將要被轉化的word文檔
String htmlStr = doc.toString();
return htmlStr;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
驗證結果:
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,則將圖片轉為base64編碼,保存在一個頁面中
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();
}
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();
}
}
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();
}
驗證結果:
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();
}
public String pdfToHtmlStr(String pdfPath) throws IOException, ParserConfigurationException {
try(ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
PdfDocument pdf = new PdfDocument();
pdf.loadFromFile(pdfPath);
return outputStream.toString();
}
}
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</td><td>姓名</td><td>性別</td><td>聯系方式</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</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xx路xx弄xx號</td></tr></table></body></html>
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();
}
}
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();
}
}
有時我們是需要的不僅僅返回html字符串,而是需要生成一個html文件這時應該怎么做呢?一個改動量小的做法就是使用org.apache.commons.io包下的FileUtils工具類寫入目標地址:
首先需要引入pom:
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.8.0</version>
</dependency>
相關代碼:
String htmlStr = FileConvertUtil.pdfToHtmlStr("D:\\書籍\\電子書\\小說\\歷史小說\\最后的可汗.doc");
FileUtils.write(new File("D:\\test\\doc.html"), htmlStr, "utf-8");
除此之外,還可以對上面的代碼進行一些調整,已實現生成html文件,代碼調整如下:
word原文件效果:
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); // 新建一個空白pdf文檔
FileOutputStream os = new FileOutputStream(file);
Document doc = new Document(wordPath); // Address是將要被轉化的word文檔
HtmlSaveOptions options = new HtmlSaveOptions();
options.setExportImagesAsBase64(true);
options.setExportRelativeFontSize(true);
doc.save(os, options);
} catch (Exception e) {
e.printStackTrace();
}
}
轉換成html的效果:
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,則將圖片轉為base64編碼,保存在一個頁面中
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();
}
轉換成html的效果:
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);
}
轉換成html的效果:
因為使用的是免費版,存在頁數和字數限制,需要完整功能的的可以選擇付費版本。PS:這回76頁的文檔居然轉成功了前50頁。
圖片版pdf原文件效果:
文字版pdf原文件效果:
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文件驗證結果:
文字版PDF文件驗證結果:
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文件驗證結果:
文字版PDF原文件效果:
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文件驗證結果:
因為使用的是免費版,所以只有前三頁是正常的。。。有超過三頁需求的可以選擇付費版本。
文字版PDF原文件效果:
報錯了無法轉換。。。
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)
excel原文件效果:
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);
}
轉換成html的效果:
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();
}
}
轉換成html的效果:
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);
}
轉換成html的效果:
從上述的效果展示我們可以發現其實轉成html效果不是太理想,很多細節樣式沒有還原,這其實是因為這類轉換往往都是追求目標是通過使用文檔中的語義信息并忽略其他細節來生成簡單干凈的 HTML,所以在轉換過程中復雜樣式被忽略,比如居中、首行縮進、字體,文本大小,顏色。舉個例子在轉換是 會將應用標題 1 樣式的任何段落轉換為 h1 元素,而不是嘗試完全復制標題的樣式。所以轉成html的顯示效果往往和原文檔不太一樣。這意味著對于較復雜的文檔而言,這種轉換不太可能是完美的。但如果都是只使用簡單樣式文檔或者對文檔樣式不太關心的這種方式也不妨一試。
PS:如果想要展示效果好的話,其實可以將上篇文章《文檔在線預覽(一)通過將txt、word、pdf轉成圖片實現在線預覽功能》說的內容和本文結合起來使用,即將文檔里的內容都生成成圖片(很可能是多張圖片),然后將生成的圖片全都放到一個html頁面里 ,用html+css來保持樣式并實現多張圖片展示,再將html返回。開源組件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其實是將文件(txt文件除外)每頁的內容都轉成了圖片,然后將這些圖片都嵌入到一個html里,再返回給用戶一個html頁面。
*請認真填寫需求信息,我們會在24小時內與您取得聯系。