EasyXLS

How to convert CSV file to Excel in Java

EasyXLS Excel library can be used to convert Excel files in Java. The library works with any Java SE application and without MS Excel installed.

Step 1: Download and install EasyXLS Excel Library for Java

To download the trial version of EasyXLS Excel Library, press the below button:

Download EasyXLS™ Excel Library for Java

If you already own a license key, you may login and download EasyXLS from your account.

Step 2: Create a Java project

If don't have a project already, create a new Java project.

Step 3: Include EasyXLS library into project

EasyXLS.jar must be added to external libraries into your project for Eclipse or to your application CLASSPATH. EasyXLS.jar can be found after installing EasyXLS, in "Lib" folder.

Add EasyXLS library to CLASSPATH

Step 4: Run Java code that converts CSV file to Excel

Execute the following Java code that converts CSV file to Excel.

package testexceljava;

/* --------------------------------------------------------------------
 | Tutorial 39
 |
 | This tutorial shows how to convert CSV file to Excel in Java. The
 | CSV file generated by Tutorial 30 is imported, some data is modified
 | and after that is exported as Excel file.
 * -------------------------------------------------------------------- */

import java.io.FileInputStream;
import EasyXLS.*;

public class Tutorial39 {

    public static void main(String[] args) {
        try {
            System.out.println("Tutorial 39");
            System.out.println("----------");

            // Create an instance of the class used to import/export Excel files
            ExcelDocument workbook = new ExcelDocument();

            // Import CSV file
            System.out.println("Reading file C:\\Samples\\Tutorial30.csv.");
            FileInputStream file = new FileInputStream("C:\\Samples\\Tutorial30.csv");
            if (workbook.easy_LoadCSVFile(file))
            {
                // Set worksheet name
                workbook.easy_getSheetAt(0).setSheetName("First tab");

                // Add new worksheet and add some data in cells (optional step)
                workbook.easy_addWorksheet("Second tab");
                ExcelTable xlsTable = ((ExcelWorksheet)workbook.easy_getSheetAt(1)).easy_getExcelTable();
                xlsTable.easy_getCell("A1").setValue("Data added by Tutorial39");

                for (int column=0; column<5; column++)
                {
                    xlsTable.easy_getCell(1, column).setValue("Data " + (column + 1));
                }

                // Export Excel file
                System.out.println("Writing file C:\\Samples\\Tutorial39 - convert CSV to Excel.xlsx.");
                workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial39 - convert CSV to Excel.xlsx");

                // Confirm conversion of CSV to Excel
                if (workbook.easy_getError().equals(""))
                    System.out.println("File successfully created.");
                else
                    System.out.println("Error encountered: " + workbook.easy_getError());
            }
            
            // Dispose memory
            workbook.Dispose();
        }
        catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

EasyXLS Excel libraries:

Java
Excel Library for Java
full Java version to import, export or convert Excel files
Download EasyXLS™ Excel Library for Java

File formats:

MS Excel 97 - 2003
MS Excel 2007 - 2019
MS Excel 2021
Office 365
XLSXXLSMXLSBXLS
XMLHTMLCSVTXT