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Java code to convert xlsx & xls to csv

Posted by Gokul in CSV, Java, Java Excel

Note : This Program uses XSSFWorkbook for xlsx and HSSFWorkbook for xlx.

package com.simplecode.excel;

import java.io.*;
import java.util.Iterator;

import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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 ExcelToCSV {

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

	// Get the workbook instance for XLSX file
	XSSFWorkbook wb = new XSSFWorkbook(new FileInputStream(inputFile));

	// Get first sheet from the workbook
	XSSFSheet sheet = wb.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:
			cellValue.append(cell.getBooleanCellValue() + ",");
			break;
		
		case Cell.CELL_TYPE_NUMERIC:
			cellValue.append(cell.getNumericCellValue() + ",");
			break;
		
		case Cell.CELL_TYPE_STRING:
			cellValue.append(cell.getStringCellValue() + ",");
			break;

		case Cell.CELL_TYPE_BLANK:
			cellValue.append("" + ",");
			break;
			
		default:
			cellValue.append(cell + ",");

		}
	}
	}

fos.write(cellValue.toString().getBytes());
fos.close();

}
catch (Exception e)
{
	System.err.println("Exception :" + e.getMessage());
}
}

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

	// Get the workbook instance for XLS file
	HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(inputFile));
	// Get first sheet from the workbook
	HSSFSheet sheet = workbook.getSheetAt(0);
	Cell cell;
	Row row;

	// 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:
		cellDData.append(cell.getBooleanCellValue() + ",");
		break;
	
	case Cell.CELL_TYPE_NUMERIC:
		cellDData.append(cell.getNumericCellValue() + ",");
		break;
	
	case Cell.CELL_TYPE_STRING:
		cellDData.append(cell.getStringCellValue() + ",");
		break;

	case Cell.CELL_TYPE_BLANK:
		cellDData.append("" + ",");
		break;
		
	default:
		cellDData.append(cell + ",");
	}
	}
	}

fos.write(cellDData.toString().getBytes());
fos.close();

}
catch (FileNotFoundException e)
{
    System.err.println("Exception" + e.getMessage());
}
catch (IOException e)
{
	System.err.println("Exception" + e.getMessage());
}
}

public static void main(String[] args)
{
	File inputFile = new File("C:\input.xls");
	File outputFile = new File("C:\output1.csv");
	File inputFile2 = new File("C:\input.xlsx");
	File outputFile2 = new File("C:\output2.csv");
	convertToXls(inputFile, outputFile);
	convertToXlsx(inputFile2, outputFile2);
}
}

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

Download It – ExcelToCSV

Java Code to Convert XLSX to CSV Files

Posted by Mohaideen Jamil in CSV, Java, Java Excel | 6 comments

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() + ",");

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

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

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

					}
				}
			}

			fos.write(data.toString().getBytes());
			fos.close();

		} catch (Exception ioe) {
			ioe.printStackTrace();
		}
	}
	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. Read More

Converting XLS to CSV files Using Java

Posted by Mohaideen Jamil in CSV, Java, Java Excel

package com.simplecode.excel;

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

import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;

class XlstoCSV
{
static void xls(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 XLS file
	HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(inputFile));
	// Get first sheet from the workbook
	HSSFSheet sheet = workbook.getSheetAt(0);
	Cell cell;
	Row row;

	// 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() + ",");
				break;
				
			case Cell.CELL_TYPE_NUMERIC:
				data.append(cell.getNumericCellValue() + ",");
				break;
				
			case Cell.CELL_TYPE_STRING:
				data.append(cell.getStringCellValue() + ",");
				break;

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

	fos.write(data.toString().getBytes());
	fos.close();
	}
	catch (FileNotFoundException e)
	{
		e.printStackTrace();
	}
	catch (IOException e)
	{
		e.printStackTrace();
	}
	}

	public static void main(String[] args)
	{
		File inputFile = new File("C:\test.xls");
		File outputFile = new File("C:\output.csv");
		xls(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

Java Code to Read XLS and XLSX Files

Posted by Mohaideen Jamil in Java Excel | 4 comments

Note : This Program uses XSSFWorkbook for xlsx and HSSFWorkbook for xlx.

package com.simplecode.excel;

import java.io.*;
import java.util.Iterator;

import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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 ExcelReader
{
static void readXlsx(File inputFile)
{
try
{
	// Get the workbook instance for XLSX file
	XSSFWorkbook wb = new XSSFWorkbook(new FileInputStream(inputFile));

	// Get first sheet from the workbook
	XSSFSheet sheet = wb.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:
			System.out.println(cell.getBooleanCellValue());
			break;

		case Cell.CELL_TYPE_NUMERIC:
			System.out.println(cell.getNumericCellValue());
			break;

		case Cell.CELL_TYPE_STRING:
			System.out.println(cell.getStringCellValue());
			break;

		case Cell.CELL_TYPE_BLANK:
			System.out.println(" ");
			break;

		default:
			System.out.println(cell);

		}
		}
	}
}
catch (Exception e)
{
	System.err.println("Exception :" + e.getMessage());
}
}

static void readXls(File inputFile)
{
try
{
	// Get the workbook instance for XLS file
	HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(inputFile));
	// Get first sheet from the workbook
	HSSFSheet sheet = workbook.getSheetAt(0);
	Cell cell;
	Row row;

	// 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:
			System.out.println(cell.getBooleanCellValue());
			break;

		case Cell.CELL_TYPE_NUMERIC:
			System.out.println(cell.getNumericCellValue());
			break;

		case Cell.CELL_TYPE_STRING:
			System.out.println(cell.getStringCellValue());
			break;

		case Cell.CELL_TYPE_BLANK:
			System.out.println(" ");
			break;

		default:
			System.out.println(cell);
		}
		}
	}

}

catch (FileNotFoundException e)
{
	System.err.println("Exception" + e.getMessage());
}
catch (IOException e)
{
	System.err.println("Exception" + e.getMessage());
}
}

public static void main(String[] args)
{
	File inputFile = new File("C:\input.xls");
	File inputFile2 = new File("C:\input.xlsx");
	readXls(inputFile);
	readXlsx(inputFile2);
}
}

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

Download It – ExcelReader

Read Excel with Java (Jexcel-api)

Posted by Mohaideen Jamil in Java, Java Excel

This article demonstrate how to read Excel files with the Java Excel API.

ExcelApi – one of a number of open-source java Excel API, designed for reading, writing, and editing of dynamic excel. Among its features are:

Reading from the book Excel 95, 97, 2000, XP, and 2003
Reading and writing formulas
Creating a list in Excel 2000
Support for formatting fonts, numbers and dates
Support colors, borders, and colors of cells
Changing existing books excel
Localization support
Copying charts
Copying and pasting drawings
Logging events

Download – Java Excel library

package com.simplecode.reader;

import java.io.File;
import java.io.IOException;

import jxl.Cell;
import jxl.CellType;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;

public class ReadExcel {

  public static void main(String[] args) throws IOException {
    ReadExcel test = new ReadExcel();
    test.setInputFile("c:/temp/output.xls");
    test.read();
  }

  private String inputFile;

  public void setInputFile(String inputFile) {
    this.inputFile = inputFile;
  }

  public void read() throws IOException  {
    File inputWorkbook = new File(inputFile);
    Workbook w;
    try {
      w = Workbook.getWorkbook(inputWorkbook);
      // Get the first sheet
      Sheet sheet = w.getSheet(0);
      // Loop over first 10 column and lines

      for (int j = 0; j < sheet.getColumns(); j++) {
        for (int i = 0; i < sheet.getRows(); i++) {
          Cell cell = sheet.getCell(j, i);
          CellType type = cell.getType();
          if (type == CellType.LABEL) {
            System.out.println("I got a label "
                + cell.getContents());
          }

          if (type == CellType.NUMBER) {
            System.out.println("I got a number "
                + cell.getContents());
          }

        }
      }
    } catch (BiffException e) {
      e.printStackTrace();
    }
  }
}

Write Excel with Java (Jexcel-api)

Posted by Mohaideen Jamil in Java, Java Excel

This article demonstrate how to create Excel files with the Java Excel API.

ExcelApi – one of a number of open-source java Excel API, designed for reading, writing, and editing of dynamic excel. Among its features are:

Reading from the book Excel 95, 97, 2000, XP, and 2003
Reading and writing formulas
Creating a list in Excel 2000
Support for formatting fonts, numbers and dates
Support colors, borders, and colors of cells
Changing existing books excel
Localization support
Copying charts
Copying and pasting drawings
Logging events

Download – Java Excel library

package com.simplecode.writer;

import java.io.File;
import java.io.IOException;
import java.util.Locale;

import jxl.CellView;
import jxl.Workbook;
import jxl.WorkbookSettings;
import jxl.format.UnderlineStyle;
import jxl.write.Formula;
import jxl.write.Label;
import jxl.write.Number;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;

public class WriteExcel {

	public static void main(String[] args) throws WriteException, IOException {
		WriteExcel test = new WriteExcel();
		test.setOutputFile("c:\temp\input.xls");
		test.write();
		System.out.println("Please check the result file under c:\temp\input.xls ");
	}

	private WritableCellFormat timesBoldUnderline;
	private WritableCellFormat times;
	private String inputFile;

	public void setOutputFile(String inputFile) {
		this.inputFile = inputFile;
	}

	public void write() throws IOException, WriteException {
		File file = new File(inputFile);
		WorkbookSettings wbSettings = new WorkbookSettings();

		wbSettings.setLocale(new Locale("en", "EN"));

		WritableWorkbook workbook = Workbook.createWorkbook(file, wbSettings);
		workbook.createSheet("Report", 0);
		WritableSheet excelSheet = workbook.getSheet(0);
		createLabel(excelSheet);
		createContent(excelSheet);

		workbook.write();
		workbook.close();
	}

	private void createLabel(WritableSheet sheet) throws WriteException {
		// Lets create a times font
		WritableFont times10pt = new WritableFont(WritableFont.TIMES, 10);
		// Define the cell format
		times = new WritableCellFormat(times10pt);
		// Lets automatically wrap the cells
		times.setWrap(true);

		// Create create a bold font with under lines
		WritableFont times10ptBoldUnderline = new WritableFont(
				WritableFont.TIMES, 10, WritableFont.BOLD, false,
				UnderlineStyle.SINGLE);
		timesBoldUnderline = new WritableCellFormat(times10ptBoldUnderline);
		// Lets automatically wrap the cells
		timesBoldUnderline.setWrap(true);

		CellView cv = new CellView();
		cv.setFormat(times);
		cv.setFormat(timesBoldUnderline);
		cv.setAutosize(true);

		// Write a few headers
		addCaption(sheet, 0, 0, "Header 1");
		addCaption(sheet, 1, 0, "This is another header");

	}

	private void createContent(WritableSheet sheet) throws WriteException,
			RowsExceededException {
		// Write a few number
		for (int i = 1; i < 10; i++) {
			// First column
			addNumber(sheet, 0, i, i + 10);
			// Second column
			addNumber(sheet, 1, i, i * i);
		}
		// Lets calculate the sum of it
		StringBuffer buf = new StringBuffer();
		buf.append("SUM(A2:A10)");
		Formula f = new Formula(0, 10, buf.toString());
		sheet.addCell(f);
		buf = new StringBuffer();
		buf.append("SUM(B2:B10)");
		f = new Formula(1, 10, buf.toString());
		sheet.addCell(f);

		// Now a bit of text
		for (int i = 12; i < 20; i++) {
			// First column
			addLabel(sheet, 0, i, "Boring text " + i);
			// Second column
			addLabel(sheet, 1, i, "Another text");
		}
	}

	private void addCaption(WritableSheet sheet, int column, int row, String s)
			throws RowsExceededException, WriteException {
		Label label;
		label = new Label(column, row, s, timesBoldUnderline);
		sheet.addCell(label);
	}

	private void addNumber(WritableSheet sheet, int column, int row,
			Integer integer) throws WriteException, RowsExceededException {
		Number number;
		number = new Number(column, row, integer, times);
		sheet.addCell(number);
	}

	private void addLabel(WritableSheet sheet, int column, int row, String s)
			throws WriteException, RowsExceededException {
		Label label;
		label = new Label(column, row, s, times);
		sheet.addCell(label);
	}
}

Let me know if you face any issues.
Happy learning :)

Page 1 of 212 »

Java code to convert xlsx & xls to csv

To execute the above code you must have the following libraries

Java Code to Convert XLSX to CSV Files

To execute the above code you must have the following libraries

Converting XLS to CSV files Using Java

To execute the above code you must have the following libraries

Java Code to Read XLS and XLSX Files

Read Excel with Java (Jexcel-api)

Write Excel with Java (Jexcel-api)

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