POI如何合并单元格

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

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

/**
 * @author longrong.lang
 * @version 1.0
 * @description
 * @date 2020/9/15 9:32
 */
public class MergeCellDemo {
    public static void main(String[] args) throws IOException {
        //新建工作簿
        XSSFWorkbook xssfWorkbook = new XSSFWorkbook();
        //新建工作表
        XSSFSheet sheet = xssfWorkbook.createSheet("工作表1");
        //指定合并开始行、合并结束行 合并开始列、合并结束列
        CellRangeAddress rangeAddress = new CellRangeAddress(0, 0, 0, 1);
        //添加要合并地址到表格
        sheet.addMergedRegion(rangeAddress);
        //创建行，指定起始行号，从0开始
        XSSFRow row = sheet.createRow(0);
        //创建单元格，指定起始列号，从0开始
        XSSFCell cell = row.createCell(0);
        //设置单元格内容
        cell.setCellValue("我是合并后的单元格");
        //创建样式对象
        CellStyle style = xssfWorkbook.createCellStyle();
        //设置样式对齐方式：水平垂直居中
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        //设定填充单色
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        //设定背景颜色
        style.setFillForegroundColor(IndexedColors.PINK.getIndex());
        //为指定单元格设定样式
        cell.setCellStyle(style);
        FileOutputStream fileOutputStream = new FileOutputStream("d:\MergeCellDemo.xlsx");
        xssfWorkbook.write(fileOutputStream);
        fileOutputStream.close();
    }
}