html to word poi

In modern society, we often need to convert web content into other document formats to facilitate use and sharing. Among them, converting HTML format to Word format is a common requirement because Word format has wide application and ease of use, while HTML format contains a large amount of web page information and multimedia elements. This article introduces a method of using the POI library to convert HTML format to Word format to help readers solve related problems.

1. Introduction to POI library
Apache POI (Poor Obfuscation Implementation) is a Java library used to read and write Microsoft Office format files, including Word, Excel, PowerPoint and other file formats. It is implemented in pure Java, can be used across platforms, and is suitable for various Java development environments. POI library has a large development community and a high degree of customization, which can realize rich functions and customized needs. Therefore, using the POI library to convert HTML to Word is a low-cost and reliable method.

2. HTML to POI conversion
First, we need to read the document in HTML format and convert it into a format that POI can process. The XWPFDocument class in POI can provide templates in Word format, into which we can insert HTML content. The specific operation method is as follows:

1. Read HTML file
   You can use the file reading stream in Java to read the file content into the program, for example:

File htmlFile = new File("test.html");
StringBuilder htmlContent = new StringBuilder();
try {

BufferedReader in = new BufferedReader(new FileReader(htmlFile));
String line;
while ((line = in.readLine()) != null) {
    htmlContent.append(line);
}

} catch (IOException e) {

e.printStackTrace();

}

2. Parsing HTML content
   After reading the HTML file, we need to parse the tags, styles, text and other contents through some rules in order to insert it into the Word template. Here we use the jsoup library for HTML parsing. jsoup is a powerful and easy-to-operate Java HTML parser that can help us quickly parse HTML content. For example, we can read all text content in HTML with the following code:

Document doc = Jsoup.parse(htmlContent.toString());
String textContent = doc.body() .text();

3. Create Word document
   With the HTML content and parsing results, we can start to create the Word document. In POI, we can create a new Word document through the XWPFDocument class, as follows:

XWPFDocument doc = new XWPFDocument();

4. Insert HTML content
   After we have the Word template and HTML content, we need to combine them. Here we can first use the run class in POI to insert text content. The specific operation method is as follows:

XWPFParagraph para = doc.createParagraph();
for (Node node : doc.childNodes()) {

if (node instanceof TextNode) {
    para.createRun().setText(((TextNode) node).text());
} else if (node instanceof Element) {
    Element ele = (Element) node;
    switch (ele.tagName().toLowerCase()) {
        case "b":
        case "strong":
            para.createRun().setBold(true);
            break;
        case "i":
        case "em":
            para.createRun().setItalic(true);
            break;
        case "u":
            para.createRun().setUnderline(UnderlinePatterns.SINGLE);
            break;
        case "strike":
            para.createRun().setStrike(true);
            break;
        default:
            para.createRun().setText(ele.text());
    }
}

}

Here, we recursively parse HTML nodes and tags to insert text, styles and other content into the Word template in sequence. The XWPFRun class in POI is used to format the text content, such as bold, italics, underline, strikethrough, etc.

5. Output Word document
   Finally, we need to output the generated Word document for subsequent use and sharing. The specific method is as follows:

try (FileOutputStream out = new FileOutputStream("test.docx")) {

doc.write(out);

} catch (IOException e) {

e.printStackTrace();

}

Here, we use the file output stream in Java to output the XWPFDocument object to a file to generate a usable Word document.

3. Summary
Using the POI library to convert HTML format to Word format is a simple and reliable method that can meet the needs of daily web content conversion. This article mainly introduces how to read HTML format files, convert them into a format that POI can process, and use POI's XWPFDocument class to insert HTML content and output Word documents. Readers can customize and optimize according to their own needs to obtain better experience and effects.

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