html to pdf java

With the continuous development of Internet technology, we are increasingly using various online documents and materials to study and work. However, sometimes we need to convert some HTML format web pages or online documents into PDF format files for better preservation and sharing. Today we will introduce how to convert HTML to PDF using a Java program.

1. Choose a PDF conversion tool

First of all, we need to choose an excellent PDF conversion tool. There are many such tools on the market, such as iText, PDFBox, Flying Saucer, etc. We can choose the tool that suits us based on our needs and learning experience. This article will use iText as an example to explain.

2. Download and configure the iText library

Before using iText to convert HTML to PDF, we need to download and configure the iText library. The iText official website provides download links for the latest iText 7 library and iText 5 library. We can choose the corresponding version according to our needs. After the download is completed, we need to introduce the iText jar package into our Java project and establish the corresponding dependencies.

3. Writing Java code

Now we can start writing Java code. We need to use the PdfWriter and XMLWorkerHelper classes in iText to convert HTML to PDF. The specific code is as follows:

public class Html2Pdf {
    public static void main(String[] args) {
        String htmlFilePath = "/path/to/your/html/file";
        String pdfFilePath = "/path/to/your/pdf/file";
        try {
            // 创建文档对象
            Document document = new Document();
            PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(pdfFilePath));

            // 打开文档
            document.open();
            XMLWorkerHelper worker = XMLWorkerHelper.getInstance();

            // 读入html文件
            FileInputStream fis = new FileInputStream(htmlFilePath);
            InputStreamReader isr = new InputStreamReader(fis, "utf-8");
            BufferedReader br = new BufferedReader(isr);

            // 将html文件转换为pdf文件
            worker.parseXHtml(writer, document, fis, Charset.forName("utf-8"));

            // 关闭文档
            document.close();
            fis.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

In the above code, we first created a Document object and PdfWriter object, and opened the document. Then, we use the parseXHtml method of the XMLWorkerHelper class to convert the HTML file to a PDF file. Finally, we close the document and file stream. Before that, we need to assign the path of the HTML file and the path of the PDF file to htmlFilePath and pdfFilePath respectively.

4. Run the program

After we finish writing the Java code, we can run the program to convert HTML to PDF. Before running the program, we need to ensure that the input HTML file and output PDF file paths are correct, and that we have correctly downloaded and configured the iText library. If the program fails to run, we can view the error message on the console to debug and modify the program.

Conclusion

Through the introduction of this article, we can see that it is very simple to use Java programs to convert HTML to PDF. Of course, in actual work and study, we also need to consider more details and issues, such as coding format, text typesetting, page layout, etc. Therefore, we need to continue to learn and explore, and improve our Java programming skills and PDF operation skills to better meet our needs.

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