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免費(fèi)咨詢熱線：
迎點(diǎn)擊右上角關(guān)注小編，除了分享技術(shù)文章之外還有很多福利，私信學(xué)習(xí)資料可以領(lǐng)取包括不限于Python實(shí)戰(zhàn)演練、PDF電子文檔、面試集錦、學(xué)習(xí)資料等。
對于PDF轉(zhuǎn)換成word文檔，我想很多人都了解過，那就是需要付費(fèi)，而且很貴，但是如果你會Python，只要你會Python這么問題都不再是問題。
pdf文件轉(zhuǎn)換為word文件
Word文件轉(zhuǎn)換為pdf文件
doc轉(zhuǎn)docx
docx轉(zhuǎn)html
Tika是一個(gè)內(nèi)容分析工具，自帶全面的parser工具類，能解析基本所有常見格式的文件，得到文件的metadata，content等內(nèi)容，返回格式化信息。總的來說可以作為一個(gè)通用的解析工具。特別對于搜索引擎的數(shù)據(jù)抓去和處理步驟有重要意義。Tika是Apache的Lucene項(xiàng)目下面的子項(xiàng)目，在lucene的應(yīng)用中可以使用tika獲取大批量文檔中的內(nèi)容來建立索引，非常方便，也很容易使用。Apache Tika toolkit可以自動(dòng)檢測各種文檔(如word,ppt,xml,csv,ppt等)的類型并抽取文檔的元數(shù)據(jù)和文本內(nèi)容。Tika集成了現(xiàn)有的文檔解析庫，并提供統(tǒng)一的接口，使針對不同類型的文檔進(jìn)行解析變得更簡單。Tika針對搜索引擎索引、內(nèi)容分析、轉(zhuǎn)化等非常有用。
應(yīng)用程序員可以很容易地在他們的應(yīng)用程序集成Tika。Tika提供了一個(gè)命令行界面和圖形用戶界面，使它比較人性化。在本章中，我們將討論構(gòu)成Tika架構(gòu)的四個(gè)重要模塊。下圖顯示了Tika的四個(gè)模塊的體系結(jié)構(gòu)：
每當(dāng)一個(gè)文本文件被傳遞到Tika，它將檢測在其中的語言。它接受沒有語言的注釋文件和通過檢測該語言添加在該文件的元數(shù)據(jù)信息。支持語言識別，Tika 有一類叫做語言標(biāo)識符在包org.apache.tika.language及語言識別資料庫里面包含了語言檢測從給定文本的算法。Tika 內(nèi)部使用N-gram算法語言檢測。
Tika可以根據(jù)MIME標(biāo)準(zhǔn)檢測文檔類型。Tika默認(rèn)MIME類型檢測是使用org.apache.tika.mime.mimeTypes。它使用org.apache.tika.detect.Detector 接口大部分內(nèi)容類型檢測。內(nèi)部Tika使用多種技術(shù)，如文件匹配替換，內(nèi)容類型提示，魔術(shù)字節(jié)，字符編碼，以及其他一些技術(shù)。
org.apache.tika.parser 解析器接口是Tika解析文檔的主要接口。該接口從提取文檔中的文本和元數(shù)據(jù)，并總結(jié)了其對外部用戶愿意寫解析器插件。采用不同的具體解析器類，具體為各個(gè)文檔類型，Tika 支持大量的文件格式。這些格式的具體類不同的文件格式提供支持，無論是通過直接實(shí)現(xiàn)邏輯分析器或使用外部解析器庫。
使用的Tika facade類是從Java調(diào)用Tika的最簡單和直接的方式，而且也沿用了外觀的設(shè)計(jì)模式。可以在 Tika API的org.apache.tika包Tika 找到外觀facade類。通過實(shí)現(xiàn)基本用例，Tika作為facade的代理。它抽象了的Tika庫的底層復(fù)雜性，例如MIME檢測機(jī)制，解析器接口和語言檢測機(jī)制，并提供給用戶一個(gè)簡單的接口來使用。
實(shí)現(xiàn)word文檔轉(zhuǎn)html
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>springboot-demo</artifactId>
<groupId>com.et</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>tika</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.tika</groupId>
<artifactId>tika-parsers</artifactId>
<version>1.17</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
</dependencies>
</project>package com.et.tika.controller;
import com.et.tika.convertor.WordToHtmlConverter;
import com.et.tika.dto.ConvertedDocumentDTO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import java.util.HashMap;
import java.util.Map;
@RestController
@Slf4j
public class HelloWorldController {
@RequestMapping("/hello")
public Map<String, Object> showHelloWorld(){
Map<String, Object> map = new HashMap<>();
map.put("msg", "HelloWorld");
return map;
}
@Autowired
WordToHtmlConverter converter;
/**
* Transforms the Word document into HTML document and returns the transformed document.
*
* @return The content of the uploaded document as HTML.
*/
@RequestMapping(value = "/api/word-to-html", method = RequestMethod.POST)
public ConvertedDocumentDTO convertWordDocumentIntoHtmlDocument(@RequestParam(value = "file", required = true) MultipartFile wordDocument) {
log.info("Converting word document into HTML document");
ConvertedDocumentDTO htmlDocument = converter.convertWordDocumentIntoHtml(wordDocument);
log.info("Converted word document into HTML document.");
log.trace("The created HTML markup looks as follows: {}", htmlDocument);
return htmlDocument;
}
}package com.et.tika.convertor;
import com.et.tika.dto.ConvertedDocumentDTO;
import com.et.tika.exception.DocumentConversionException;
import lombok.extern.slf4j.Slf4j;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.Parser;
import org.apache.tika.parser.microsoft.ooxml.OOXMLParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import org.xml.sax.SAXException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.TransformerException;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
/**
*
*/
@Component
@Slf4j
public class WordToHtmlConverter {
/**
* Converts a .docx document into HTML markup. This code
* is based on <a href="http://stackoverflow.com/a/9053258/313554">this StackOverflow</a> answer.
*
* @param wordDocument The converted .docx document.
* @return
*/
public ConvertedDocumentDTO convertWordDocumentIntoHtml(MultipartFile wordDocument) {
log.info("Converting word document: {} into HTML", wordDocument.getOriginalFilename());
try {
InputStream input = wordDocument.getInputStream();
Parser parser = new OOXMLParser();
StringWriter sw = new StringWriter();
SAXTransformerFactory factory = (SAXTransformerFactory)
SAXTransformerFactory.newInstance();
TransformerHandler handler = factory.newTransformerHandler();
handler.getTransformer().setOutputProperty(OutputKeys.ENCODING, "utf-8");
handler.getTransformer().setOutputProperty(OutputKeys.METHOD, "html");
handler.getTransformer().setOutputProperty(OutputKeys.INDENT, "yes");
handler.setResult(new StreamResult(sw));
Metadata metadata = new Metadata();
metadata.add(Metadata.CONTENT_TYPE, "text/html;charset=utf-8");
parser.parse(input, handler, metadata, new ParseContext());
return new ConvertedDocumentDTO(wordDocument.getOriginalFilename(), sw.toString());
}
catch (IOException | SAXException | TransformerException | TikaException ex) {
log.error("Conversion failed because an exception was thrown", ex);
throw new DocumentConversionException(ex.getMessage(), ex);
}
}
}package com.et.tika.dto;
import org.apache.commons.lang.builder.ToStringBuilder;
/**
*
*/
public class ConvertedDocumentDTO {
private final String contentAsHtml;
private final String filename;
public ConvertedDocumentDTO(String filename, String contentAsHtml) {
this.contentAsHtml = contentAsHtml;
this.filename = filename;
}
public String getContentAsHtml() {
return contentAsHtml;
}
public String getFilename() {
return filename;
}
@Override
public String toString() {
return new ToStringBuilder(this)
.append("filename", this.filename)
.append("contentAsHtml", this.contentAsHtml)
.toString();
}
}package com.et.tika.exception;
/**
*
*/
public final class DocumentConversionException extends RuntimeException {
public DocumentConversionException(String message, Exception ex) {
super(message, ex);
}
}以上只是一些關(guān)鍵代碼，所有代碼請參見下面代碼倉庫
啟動(dòng)Spring Boot應(yīng)用
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）通過將文件轉(zhuǎn)成圖片實(shí)現(xiàn)在線預(yù)覽功能說的將文檔轉(zhuǎn)成圖片的實(shí)現(xiàn)方式外，還有轉(zhuǎn)成pdf，前端通過pdf.js、pdfobject.js等插件來實(shí)現(xiàn)在線預(yù)覽，以及本文將要說到的將文檔轉(zhuǎn)成html的方式來實(shí)現(xiàn)在線預(yù)覽。
以下代碼分別提供基于aspose、pdfbox、spire來實(shí)現(xiàn)來實(shí)現(xiàn)txt、word、pdf、ppt、word等文件轉(zhuǎn)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(shù)十個(gè)國家的數(shù)千機(jī)構(gòu)都有用過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
<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?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(fèi)開源的跨平臺的 Java API，Apache POI提供API給Java程序?qū)icrosoft Office格式檔案讀和寫的功能。
Apache PDFBox是一個(gè)開源Java庫，支持PDF文檔的開發(fā)和轉(zhuǎn)換。 使用此庫，您可以開發(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
<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(yè)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(fèi)版本，但是存在只能導(dǎo)出前3頁以及只能導(dǎo)出前500行的限制，只要達(dá)到其一就會觸發(fā)限制。需要超出前3頁以及只能導(dǎo)出前500行的限制的這需要購買付費(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(xiàng)目的pom文件里添加如下依賴
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>
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：
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(yàn)證結(jié)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(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</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</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</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</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</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</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</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</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</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</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</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</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</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</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(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工具類寫入目標(biāo)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(guān)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(jìn)行一些調(diào)整，已實(shí)現(xiàn)生成html文件，代碼調(diào)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(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：
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：
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頁的文檔居然轉(zhuǎn)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(yàn)證結(jié)果：
文字版PDF文件驗(yàn)證結(jié)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(yàn)證結(jié)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(yàn)證結(jié)果：
因?yàn)槭褂玫氖敲赓M(fèi)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(fèi)版本。
文字版PDF原文件效果：
報(bào)錯(cuò)了無法轉(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)
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(zhuǎn)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(zhuǎn)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(zhuǎn)換成html的效果：
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@類轉(zhuǎn)換往往都是追求目標(biāo)是通過使用文檔中的語義信息并忽略其他細(xì)節(jié)來生成簡單干凈的 HTML，所以在轉(zhuǎn)換過程中復(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單樣式文檔或者對文檔樣式不太關(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）通過將txt、word、pdf轉(zhuǎn)成圖片實(shí)現(xiàn)在線預(yù)覽功能》說的內(nèi)容和本文結(jié)合起來使用，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頁面里 ，用html+css來保持樣式并實(shí)現(xiàn)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(shí)是將文件（txt文件除外）每頁的內(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頁面。
*請認(rèn)真填寫需求信息，我們會在24小時(shí)內(nèi)與您取得聯(lián)系。
