How to write data to an existing excel using apache poi

Question

My excel sheet contains 5 row and 2 columns.I want to add one more column in that excel.But when i am using WorkbookFactory,it is showing error.I imported poi-3.8.jar and poi-ooxml-3.5-beta5.jar.It is giving error Exception in thread "main" java.lang.Error: Unresolved compilation problem: WorkbookFactory cannot be resolved.Please help me what to do.

Answer 1

try this


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;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelExample {

    public static void main(String[] args) throws IOException {

        try {

            FileInputStream file = new FileInputStream(new File("C:\\test.xls"));

            HSSFWorkbook workbook = new HSSFWorkbook(file);
            HSSFSheet sheet = workbook.getSheetAt(0);
            Cell cell = null;

            //Update the value of cell
            cell = sheet.getRow(1).getCell(2);
            cell.setCellValue(cell.getNumericCellValue() * 2);
            cell = sheet.getRow(2).getCell(2);
            cell.setCellValue(cell.getNumericCellValue() * 2);
            Row row = sheet.getRow(0);
            row.createCell(3).setCellValue("Value 2");

            file.close();

            FileOutputStream outFile =new FileOutputStream(new File("C:\\update.xls"));
            workbook.write(outFile);
            outFile.close();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}