poi word to html

With the development of the Internet, HTML has become the most common web page production language, and Word is one of the most popular office software, and the documents it creates are widely used in all walks of life. Therefore, converting Word documents to HTML format allows them to be better published on the Internet. This article will introduce a method of converting Word to HTML based on the POI library.

1. Introduction to POI library

Apache POI is a Java API for reading and writing Microsoft Office binary format files. POI provides a series of standard APIs to process files in .doc, .docx, .ppt, .pptx, .xls and .xlsx formats. The latest version of POI is 4.1.2, which supports all versions of Office document formats, including Office 97-2003, Office 2007-2013 and Office 2016.

2. Use POI to convert Word to HTML

Based on the POI library, we can convert text, tables, pictures, hyperlinks and styles in Word into HTML format. The specific implementation steps are as follows:

1. Load Word document

First, we need to load the Word document. POI provides the XWPFDocument class to load .docx format Word documents, and the HWPFDocument class to load old format .doc documents.

For example, the following code is used to load a Word document named "test.docx":

FileInputStream fis = new FileInputStream(new File("test.docx"));
XWPFDocument document = new XWPFDocument(fis);

2. Extract text and styles

Next, we need to traverse the Word document Paragraphs, text, and styles in the HTML to better represent the structure and style of the document when generating HTML.

The first step is to go through each paragraph. For each paragraph, we need to extract its style properties such as font, color, bold, etc. We also need to extract the text in the paragraph.

List<XWPFParagraph> paragraphs = document.getParagraphs();
for (XWPFParagraph para : paragraphs) {
    String text = para.getParagraphText();
    // 提取样式属性
    CTPPr ppr = para.getCTP().getPPr();
    // ...
}

3. Process text content

We need to convert the text content in the Word document into HTML format and output it. For each piece of text, we can present it through tags and styles such as bold, italics, and underline.

In addition, special characters sometimes exist in Word documents, such as spaces, tabs, newlines, etc. We need to convert these special characters into corresponding tags in HTML.

StringBuilder sb = new StringBuilder();
for (XWPFRun run : runs) {
    String text = run.getText(0);
    if(text != null) {
        // 转换特殊字符
        text = text.replace("    ", "<span>&emsp;</span>");
        text = text.replace(" ", "<span> </span>");
        text = text.replace("
", "<br>");
        // 将文本转换为HTML
        String style = getStyle(run);
        sb.append("<span ").append(style).append(">").append(text).append("</span>");
    }
}
String content = sb.toString();

4. Processing pictures and hyperlinks

After processing the text, we need to process the pictures and hyperlinks in the Word document. POI provides the XWPFRun class to handle images and hyperlinks.

For a picture, we can first extract its binary data and write it into the corresponding tag in HTML:

List<XWPFPicture> pictures = run.getEmbeddedPictures();
for (XWPFPicture pic : pictures) {
    try {
        byte[] data = pic.getPictureData().getData();
        String ext = pic.getPictureData().suggestFileExtension();
        String filename = UUID.randomUUID().toString() + "." + ext;
        // 将图片转换为HTML格式
        String imgHtml = "<img src="" + filename + "" />";
        // 写入文件
        FileOutputStream fos = new FileOutputStream(new File(outputDir, filename));
        fos.write(data);
        fos.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

For a hyperlink, we need to extract its address and text , and write them to the corresponding tags in HTML:

CTHyperlink hyperlink = run.getCTR().getHyperlinkArray(0);
if (hyperlink != null) {
    String url = hyperlink.getRArray(0).getT();
    String text = content.substring(start, end);
    String linkHtml = "<a href="" + url + "">" + text + "</a>";
    content = content.substring(0, start) + linkHtml + content.substring(end);
}

5. Output HTML file

Finally, we write the generated HTML text into the .HTML file, and The file is stored in the specified directory:

File outputDir = new File("output");
if (!outputDir.exists()) {
    outputDir.mkdirs();
}
FileOutputStream htmlFile = new FileOutputStream(new File(outputDir, "test.html"));
String html = "<!DOCTYPE html><html><head><meta charset="UTF-8"></head><body>" + content + "</body></html>";
htmlFile.write(html.getBytes("UTF-8"));
htmlFile.close();

3. Summary

This article introduces a method of converting Word to HTML based on the POI library. This method can convert text and tables in Word documents , pictures, hyperlinks, styles and other content are converted into HTML format and output to HTML files in the specified directory. This method is suitable for scenarios where Word documents need to be published to the Internet, such as e-books, papers, technical documents, etc.

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