java html to pdf

With the development of the Internet, more and more companies and individuals have begun to save and share their documents and information in electronic form. Among these electronic documents, the PDF format is undoubtedly one of the most popular and versatile formats, because it can be displayed in the same way on different platforms regardless of operating systems and applications, and it is also not easy to edit. Revise.

However, sometimes we need to convert some HTML pages or Java program output content into PDF format. At this time, we need to use some professional tools and technologies. This article introduces the specific steps and ideas of this process by explaining how the Java language uses some libraries and frameworks to realize the function of converting HTML and Java to PDF.

1. Use Flying Saucer to convert HTML to PDF

Flying Saucer is a Java CSS rendering engine specially used to convert XHTML, XML and CSS style sheets into PDF or image formats. It provides an easy-to-use API that can render complete and high-quality pages in PDF with features such as super fonts and CSS3.

1. Introduce the dependency library of Flying Saucer

Add the dependency in the pom.xml file as follows:

<dependency>    
    <groupId>org.xhtmlrenderer</groupId>    
    <artifactId>flying-saucer-pdf</artifactId>    
    <version>9.1.20</version>
</dependency>

2. Use the ITextRenderer object to convert HTML to PDF

Create a template through the following code and fill in the HTML content:

// DOM解析器
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); 
// 创建一个Model用于存储转换后的文档 
Document document = builder.newDocument(); 
 
// 读取html内容并转换为文档树 
StringReader reader = new StringReader("要转化为PDF的html格式内容"); 
InputSource source = new InputSource(reader); 
// 获取根元素 
Element root = document.getDocumentElement(); 
// 将html输入文档树种 
Node node = document.importNode(root, true); 
// 将html根元素加入文档树中 
document.appendChild(node); 
 
// 转化为PDF 
ITextRenderer renderer = new ITextRenderer(); 
renderer.setDocument(document, null); 
renderer.layout(); 
OutputStream out = new FileOutputStream(pdfUrl); 
renderer.createPDF(out);

2. Use iText to convert Java objects to PDF

In addition to converting HTML to PDF, we can also Convert Java objects to PDF files through the iText library. iText is a Java PDF operation library that provides the ability and operation API to generate PDF format files.

1. Introduce iText dependency

Add iText dependency library in Maven, as shown below:

<dependency>    
    <groupId>com.itextpdf</groupId>    
    <artifactId>itextpdf</artifactId>    
    <version>5.5.11</version>
</dependency>

2. Create PDF document object

// 创建pdf文件对象 
Document document = new Document(PageSize.A4); 
// 文件输出流 
OutputStream outputStream = new FileOutputStream("test.pdf"); 
// 将文件流作为输出对象 
PdfWriter.getInstance(document, outputStream); 
// 打开文件 
document.open(); 
// 向文件中添加段落，代码省略 
// 关闭文件 
document.close()

3 , Add content to the document

The following code can add Java objects to PDF:

// 添加文字 
Font font = new Font(); 
font.setStyle(Font.BOLD); 
font.setSize(18); 
Paragraph paragraph = new Paragraph("Hello World!", font); 
document.add(paragraph); 
 
// 添加表格 
PdfPTable table = new PdfPTable(3); 
table.addCell("Candidate ID"); 
table.addCell("Candidate Name"); 
table.addCell("Status"); 
for(int i=0;i<10;i++) { 
    table.addCell("00"+i); 
    table.addCell("Candidate "+i); 
    table.addCell("Selected"); 
}
document.add(table);

4. Output PDF file

Finally, the PDF file is exported through the file output stream Output:

// 文件输出流 
OutputStream outputStream = new FileOutputStream("test.pdf"); 
// 将文件流作为输出对象 
PdfWriter.getInstance(document, outputStream);

It can be seen that iText provides a rich API that can be used to create and manipulate PDF document objects, while Flying Saucer can handle complex CSS styles and XHTML tags well, converting HTML pages into Convert to PDF file. I believe that using these two tools, you will more easily convert HTML and Java program content into PDF files.

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