poi/examples/src/main/java/org/apache/poi/examples/ss/AligningCells.java

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this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
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http://www.apache.org/licenses/LICENSE-2.0

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package org.apache.poi.examples.ss;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CreationHelper;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

/**
 * Shows how various alignment options work.
 */
public class AligningCells {

    public static void main(String[] args) throws IOException {
        try (Workbook wb = new XSSFWorkbook()) { //or new HSSFWorkbook();

            Sheet sheet = wb.createSheet();
            Row row = sheet.createRow(2);
            row.setHeightInPoints(30);
            for (int i = 0; i < 8; i++) {
                //column width is set in units of 1/256th of a character width
                sheet.setColumnWidth(i, 256 * 15);
            }

            createCell(wb, row, 0, HorizontalAlignment.CENTER, VerticalAlignment.BOTTOM);
            createCell(wb, row, 1, HorizontalAlignment.CENTER_SELECTION, VerticalAlignment.BOTTOM);
            createCell(wb, row, 2, HorizontalAlignment.FILL, VerticalAlignment.CENTER);
            createCell(wb, row, 3, HorizontalAlignment.GENERAL, VerticalAlignment.CENTER);
            createCell(wb, row, 4, HorizontalAlignment.JUSTIFY, VerticalAlignment.JUSTIFY);
            createCell(wb, row, 5, HorizontalAlignment.LEFT, VerticalAlignment.TOP);
            createCell(wb, row, 6, HorizontalAlignment.RIGHT, VerticalAlignment.TOP);

            // Write the output to a file
            try (OutputStream fileOut = new FileOutputStream("ss-example-align.xlsx")) {
                wb.write(fileOut);
            }
        }
    }

    /**
     * Creates a cell and aligns it a certain way.
     *
     * @param wb     the workbook
     * @param row    the row to create the cell in
     * @param column the column number to create the cell in
     * @param halign the horizontal alignment for the cell.
     */
    private static void createCell(Workbook wb, Row row, int column, HorizontalAlignment halign, VerticalAlignment valign) {
        CreationHelper ch = wb.getCreationHelper();
        Cell cell = row.createCell(column);
        cell.setCellValue(ch.createRichTextString("Align It"));
        CellStyle cellStyle = wb.createCellStyle();
        cellStyle.setAlignment(halign);
        cellStyle.setVerticalAlignment(valign);
        cell.setCellStyle(cellStyle);
    }
}