src/examples/src/org/apache/poi/hssf/usermodel/examples/ReadWriteWorkbook.java

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package org.apache.poi.hssf.usermodel.examples;

import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFCell;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * This example demonstrates opening a workbook, modifying it and writing
 * the results back out.
 *
 * @author Glen Stampoultzis (glens at apache.org)
 */
public class ReadWriteWorkbook
{
    public static void main(String[] args)
        throws IOException
    {
        POIFSFileSystem fs      =
                new POIFSFileSystem(new FileInputStream("workbook.xls"));
        HSSFWorkbook wb = new HSSFWorkbook(fs);
        HSSFSheet sheet = wb.getSheetAt(0);
        HSSFRow row = sheet.getRow(2);
        if (row == null)
            row = sheet.createRow(2);
        HSSFCell cell = row.getCell((short)3);
        if (cell == null)
            cell = row.createCell((short)3);
        cell.setCellType(HSSFCell.CELL_TYPE_STRING);
        cell.setCellValue("a test");

        // Write the output to a file
        FileOutputStream fileOut = new FileOutputStream("workbook.xls");
        wb.write(fileOut);
        fileOut.close();

    }
}