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java html convert pdf

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Release： 2023-05-05 20:25:07

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Java HTML to PDF conversion: achieving efficient and reliable document conversion

With the continuous development of technology, PDF has gradually become one of the most common document formats in modern offices. Because of its high efficiency, security, reliability, and strong sealing characteristics, PDF files are widely used in fields such as electronic document delivery, online reading, and enterprises with high confidentiality requirements. However, the reality is that many users are still using documents in other formats, such as HTML, and even still using paper documents for business processing, which makes how to convert these documents to PDF very important.

In order to solve this problem, Java technology provides a rich PDF generator and HTML parser. We only need to combine them to complete the function of converting HTML documents to PDF documents. This article will share a case of converting Java HTML to PDF. This solution is implemented based on two Java libraries, iText and Jsoup.

1. Introduction to iText

iText is an open source Java library used to generate documents of PDF, XLS, HTML and other types. iText can help us convert structured data into a printable document that can be used on a Web server or embedded in a Java application. iText has the advantages of strong flexibility, high-quality PDF document generation, and unified document format, so it is favored by a wide range of Java programmers.

2. Introduction to Jsoup

Jsoup is a free, open source Java HTML parser that can easily capture the content of Web pages and parse HTML documents. Compared with Java's built-in HTML parser, Jsoup is easier to use, more accurate in parsing, and more efficient in processing, so it is widely welcomed by Java developers. In our conversion plan, Jsoup will assist us in parsing HTML documents into DOM documents, which can be passed to iText for PDF document generation.

3. HTML to PDF code example

In order to let everyone better understand the process of converting HTML to PDF in Java, we provide a complete code example here. In the code, we first use Jsoup to parse the HTML document, then convert it into string format, and finally generate the PDF document through iText, realizing the entire process from HTML to PDF.

import java.io.*;
import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;
import org.jsoup.*;
import org.jsoup.nodes.*;
import org.jsoup.select.*;

public class HtmlToPdfConverter {

    public static void main(String[] args) throws IOException, DocumentException {

        // 读取HTML文件，生成DOM树
        String htmlFilePath = "test.html";
        Document htmlDoc = Jsoup.parse(new File(htmlFilePath), "UTF-8");

        // 获取HTML文件中<body>标签内的内容
        Element body = htmlDoc.body();
        String html = body.html();

        // 生成PDF文件
        Document document = new Document();
        PdfWriter.getInstance(document, new FileOutputStream("test.pdf"));
        document.open();
        InputStream input = new ByteArrayInputStream(html.getBytes("UTF-8"));
        XMLWorkerHelper.getInstance().parseXHtml(writer, document, input, Charset.forName("UTF-8"));
        document.close();
    }
}

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In the above code, we first parse the HTML file through Jsoup to generate a DOM tree, then create a PDF document object in the memory through the Document class, use PdfWriter to output the PDF document object to the file, and then call the XMLWorkerHelper class Parse the HTML document character stream, convert it into PDF document format, and save it in the file.

4. Summary

In this article, we introduce the implementation method of converting Java HTML to PDF, mainly using two Java libraries, iText and Jsoup. iText can help us achieve high-quality PDF document generation, while Jsoup provides powerful HTML parsing capabilities.

By combining these two libraries, we can easily convert HTML documents into PDF documents. Of course, some problems may arise during this process, such as inconsistent file encoding, nested tags, etc., but as long as we pay attention to these problems and carefully debug the code, we can achieve efficient and reliable document conversion.

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