Use the "paper style" framework in the Java class library to generate PDF file
Use the "paper style" framework in the Java class library to generate PDF file
Summary:
In Java development, data often needs to be converted to PDF files for export.This article introduces how to use the "paper style" framework in the Java library to generate PDF files.This framework provides rich functions that enable developers to create and customize the style, layout and content of PDF files by programming.
1 Introduction
PDF (Portable Document Format) is a file format for displaying documents. It can be viewed and printed across platforms and across applied programs.By converting data into PDF files, the format and layout of the document can be consistent in different devices and applications.
2. Steps to generate PDF files with the "paper style" framework
Step 1: Import dependencies
First, the dependency item of the "paper style" framework needs to be added to the construction document of the project.The dependencies commonly used in this framework include Itext and Apache PDFBOX.
Step 2: Create PDF documents
In the Java code, a PDF document object needs to be created to represent the PDF file to be generated.You can use the class library provided by the framework to create a blank document and set some basic attributes, such as page size and border.
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("output.pdf"));
document.open();
Step 3: Add content
Next, you can use the method provided by the framework to add content to the PDF document, such as text, tables, pictures, etc.You can customize the appearance and location of the content by setting the style and layout.
Font font = FontFactory.getFont(FontFactory.COURIER, 18, Font.BOLD);
Paragraph paragraph = new Paragraph("Hello, World!", font);
document.add(paragraph);
Step 4: Save PDF file
Finally, you need to save the generated PDF document as a file.
document.close();
3. Example code
The following is a complete sample code, demonstrating how to use the "paper style" framework to generate PDF files containing text and tables.
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Font;
import com.itextpdf.text.FontFactory;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
public class PdfGenerator {
public static void main(String[] args) {
try {
// Create a PDF document
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("output.pdf"));
document.open();
// Add the title
Font titleFont = FontFactory.getFont(FontFactory.HELVETICA_BOLD, 18);
Paragraph title = new Paragraph("Sample PDF", titleFont);
title.setAlignment(Paragraph.ALIGN_CENTER);
document.add(title);
// Add content table
PdfPTable table = new PdfPTable(3);
PdfPCell cell1 = new PdfPCell(new Phrase("Name"));
PdfPCell cell2 = new PdfPCell(new Phrase("Age"));
PdfPCell cell3 = new PdfPCell(new Phrase("Country"));
table.addCell(cell1);
table.addCell(cell2);
table.addCell(cell3);
table.addCell("John Doe");
table.addCell("30");
table.addCell("USA");
table.addCell("Jane Smith");
table.addCell("25");
table.addCell("UK");
document.add(table);
// Save PDF file
document.close();
System.out.println("PDF generated successfully!");
} catch (DocumentException | FileNotFoundException e) {
e.printStackTrace();
}
}
}
The above example code demonstrates how to use the "paper style" framework to create a PDF file containing title and table.By setting style and layout, the appearance and content of the PDF file can be customized according to actual needs.
Summarize:
The "paper style" framework in the Java library can easily generate PDF files.By importing dependency items, creating PDF documents, adding content and saving files, PDF files with custom style and layout can be generated in the Java application.In this way, developers can convert data into a reliable and consistent format PDF file for easy sharing and printing.
