poi设置单元格边框

whiteCellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框  
whiteCellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框  
whiteCellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框  
whiteCellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框  
原文地址:https://www.cnblogs.com/wwssgg/p/15074009.html