// 单元格合并
// 四个参数分别是：起始行，起始列，结束行，结束列
sheet.addMergedRegion(new Region(0, (short) (celln + 1), 0,
(short) (celle + 1)));
试试这个呢
sheet.addMergedRegion(new CellRangeAddress(0, 0, startColumn + 3*j, startColumn + 3*j + 2));
//arg0 x轴,arg1 y轴,arg2 x长度,arg3 y长度
writableSheet.mergeCells(arg0, arg1, arg2, arg3)
addMergedRegion(new Region(行, (short)列, 行, (short)列));
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