java convert excel to pdf

In Java, you can use the Apache POI library to process Excel files, and the iText library to convert Excel files to PDF format.

Apache POI is a Java library that allows Java developers to process files in Microsoft Office formats, including Excel, Word, and PowerPoint. "POI" stands for "Poor Obfuscation Implementation" and is a tool for parsing and manipulating Microsoft's OLE2 file format.

Apache POI provides many classes and methods that can read, write, and manipulate the contents and properties of various Office files. It supports two major Office file formats:

1. HSSF (Horrible Spreadsheet Format): This is a POI sub-project for processing Excel files (.xls format). It allows you to read and write older versions of Excel files (Excel 97-2003).

2. XSSF (XML Spreadsheet Format): This is a POI sub-project for processing Excel files (.xlsx format). It allows you to read and write newer versions of Excel files (Excel 2007 and above).

Key features include:

1. Read and write Excel files: Apache POI allows you to read the content, cell values, formulas, styles, etc. in Excel files, and you can also use it to create new Excel files and fill them with data.

2. Working with Excel charts: You can use Apache POI to create, modify, and delete charts in Excel files.

3. Processing Excel formulas: Apache POI supports processing formulas in Excel cells and calculating their results.

4. Set cell style: You can use Apache POI to set style attributes such as font, color, alignment, etc. of cells.

5. Handling Excel event model: Apache POI also provides an event model that allows you to stream large Excel files without loading the entire file into memory.

6. Supports Word and PowerPoint: In addition to Excel, Apache POI also supports reading and writing Word documents (.doc and .docx formats) and PowerPoint presentations (.ppt and .pptx formats).

Apache POI is a powerful and widely used Java library that is very useful for Java application development that needs to handle Microsoft Office file formats. It is an Apache Foundation project and therefore also has stable development and maintenance support.

 The following is a simple sample code that shows how to use these two libraries to convert Excel files to PDF format files:

Add dependencies: First, make sure to add dependencies for the following two libraries in your project:

<!-- Apache POI -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>4.1.2</version>
</dependency>

<!-- iText PDF -->
<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.13.2</version>
</dependency>

Java code to convert Excel to PDF:

import java.io.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfWriter;

public class ExcelToPdfConverter {

    public static void convertExcelToPdf(String inputExcelPath, String outputPdfPath) {
        try {
            // Load Excel file
            FileInputStream fis = new FileInputStream(new File(inputExcelPath));
            Workbook workbook = new XSSFWorkbook(fis);

            // Create PDF document
            Document document = new Document();
            PdfWriter.getInstance(document, new FileOutputStream(outputPdfPath));
            document.open();

            // Read data from Excel and write to PDF
            Sheet sheet = workbook.getSheetAt(0); // Assuming data is on the first sheet
            for (Row row : sheet) {
                for (Cell cell : row) {
                    String cellValue = cell.getStringCellValue(); // You can customize this based on cell type
                    document.add(new com.itextpdf.text.Paragraph(cellValue));
                }
            }

            // Close resources
            document.close();
            workbook.close();
            fis.close();

            System.out.println("Conversion completed successfully.");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        String inputExcelPath = "path/to/your/input/excel.xlsx";
        String outputPdfPath = "path/to/your/output/pdf.pdf";

        convertExcelToPdf(inputExcelPath, outputPdfPath);
    }
}

In this example, we use Apache POI to read the contents of an Excel file and use the iText library to write the contents to a PDF file. Please make sure to replace the inputExcelPathand outputPdfPathvariables with your actual input Excel file path and output PDF file path.

Please note that this example assumes that the input Excel file has a single worksheet, if there are multiple worksheets or other special cases, you may need to adjust the code to meet your needs.

Apache POI is a powerful library for Java for processing files in Microsoft Office formats such as Excel, Word, and PowerPoint, etc. It provides the functions of reading, writing and operating Office files, and supports older versions of Excel (.xls format) and newer versions of Excel (.xlsx format) files. The main functions include reading and writing Excel file contents, processing Excel charts, processing Excel formulas, setting cell styles, and supporting Word and PowerPoint documents.

Apache POI also provides an event model that allows processing of large Excel files in a streaming manner without taking up too much memory. Its stability and widespread use make it one of the preferred tools for Java developers to work with Office file formats.

Overall, Apache POI is a very useful Java library for developing applications that need to interact with Microsoft Office files, providing many convenient features for Java developers.