java excel 一行合并多个单元格

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

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.util.CellRangeAddress;

public class TestExcel {

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

        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFCellStyle style = workbook.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

        HSSFSheet sheet = workbook.createSheet("sheet");

        HSSFRow row0 = sheet.createRow(0);
        HSSFCell cell_00 = row0.createCell(0);
        cell_00.setCellStyle(style);
        cell_00.setCellValue("AAA");
        CellRangeAddress region = new CellRangeAddress(0, 0, 0, 1);
        sheet.addMergedRegion(region);
        
        HSSFCell cell_01 = row0.createCell(2);
        cell_01.setCellStyle(style);
        cell_01.setCellValue("BBB");
        region = new CellRangeAddress(0, 0, 2, 2);
        sheet.addMergedRegion(region);
        
        HSSFCell cell_02 = row0.createCell(3);
        cell_02.setCellStyle(style);
        cell_02.setCellValue("CCC");
        region = new CellRangeAddress(0, 0, 3, 4);
        sheet.addMergedRegion(region);

        File file = new File("/home/liu/test/demo.xls");
        FileOutputStream fout = new FileOutputStream(file);
        workbook.write(fout);
        fout.close();
    }

}