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Java Code to Convert XLSX to CSV Files

Java Code to Convert XLSX to CSV Files


Note : xlsx file should contain only data in cells. No image and any other media element. This program has been developed only for cell data


package com.simplecode.excel;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Iterator;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

class XlsxtoCSV {

	static void xlsx(File inputFile, File outputFile) {
		// For storing data into CSV files
		StringBuffer data = new StringBuffer();
		try {
			FileOutputStream fos = new FileOutputStream(outputFile);

			// Get the workbook object for XLSX file
	       XSSFWorkbook wBook = new XSSFWorkbook(new FileInputStream(inputFile));

			// Get first sheet from the workbook
			XSSFSheet sheet = wBook.getSheetAt(0);
			Row row;
			Cell cell;

			// Iterate through each rows from first sheet
			Iterator<Row> rowIterator = sheet.iterator();
			while (rowIterator.hasNext()) {
				row = rowIterator.next();

				// For each row, iterate through each columns
				Iterator<Cell> cellIterator = row.cellIterator();
				while (cellIterator.hasNext()) {

					cell = cellIterator.next();

					switch (cell.getCellType()) {
					case Cell.CELL_TYPE_BOOLEAN:
						data.append(cell.getBooleanCellValue() + ",");

					case Cell.CELL_TYPE_NUMERIC:
						data.append(cell.getNumericCellValue() + ",");

					case Cell.CELL_TYPE_STRING:
						data.append(cell.getStringCellValue() + ",");

					case Cell.CELL_TYPE_BLANK:
						data.append("" + ",");
						data.append(cell + ",");



		} catch (Exception ioe) {
	public static void main(String[] args) {
		File inputFile = new File("C:\test.xlsx");
		File outputFile = new File("C:\output.csv");
		xlsx(inputFile, outputFile);

To execute the above code you must have the following libraries
  • dom4j-1.1.jar
  • poi-3.7-20101029.jar
  • poi-ooxml-3.7-20101029.jar
  • poi-ooxml-schemas-3.7-20101029.jar
  • xmlbeans-2.3.0.jar

Let me know if you face any issues.

About Mohaideen Jamil

I'm a Full stack developer of IT exp in J2EE, AngularJs, MicroServices, Docker, Spring (Boot, MVC, Cloud), Bluemix, DevOps. Follow me on Facebook or Google Plus. If you like my tutorials, consider making a donation to this charity, thanks.

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