//合并

CellRangeAddress region = new CellRangeAddress(4个参数，好比坐标一样);

sheet.addMergedRegion(region);



//拷贝样式

HSSFCell sourceCell

sourceCell = sourceRow.getCell( );

//sourceCell 原来的 cell ,targetCell 现在的cell

targetCell.setCellStyle(sourceCell.getCellStyle());

targetCell.setCellType(sourceCell.getCellType());