POI 设置单元格样式

public static void writeExcel(List data_list){
		//新建工作簿
		HSSFWorkbook workbook = new HSSFWorkbook();
		
		//自定义颜色
		HSSFPalette palette = workbook.getCustomPalette();
		//十六进制颜色RGB码
		String color = "99CC00";
		//将十六进制码转为十进制数字
		int r = Integer.parseInt(color.substring(0, 2), 16);
		int g = Integer.parseInt(color.substring(2, 4), 16);
		int b = Integer.parseInt(color.substring(4, 6), 16);
		//自定义索引颜色
		palette.setColorAtIndex((short)9, (byte)r, (byte)g, (byte)b);
		
		//创建单元格样式
		HSSFCellStyle cell_style = workbook.createCellStyle();
		//此处将HSSFCellStyle.SOLID_FOREGROUND改为FillPatternType.SOLID_FOREGROUND,网上搜索资料一堆错误用法
		cell_style.setFillPattern(FillPatternType.SOLID_FOREGROUND);  
		cell_style.setAlignment(HorizontalAlignment.CENTER);
		cell_style.setFillForegroundColor((short)9);
		//以下为API自带的颜色设置
//		cell_style.setFillForegroundColor(IndexedColors.BRIGHT_GREEN1.index);    
		
		//自定义字体颜色, 同单元格样式
		HSSFFont font = workbook.createFont();
		font.setFontHeightInPoints((short) 9);
		//字体设置为Arial
		font.setFontName(HSSFFont.FONT_ARIAL);   
		//设置索引 10 为白色
		palette.setColorAtIndex((short)10, (byte) 255, (byte) 255, (byte) 255);
		//将字体颜色设为白色
		font.setColor((short)9);
		cell_style.setFont(font);
		
		//创建sheet表格
		HSSFSheet sheet = workbook.createSheet("ServAuth");
		//设置单元格列宽
		sheet.setColumnWidth(1, 50*100);
		sheet.setColumnWidth(2, 50*100);
		sheet.setColumnWidth(3, 50*100);
		
		// 创建报文头第一行
		HSSFRow row_0 = sheet.createRow(0);
		HSSFCell cell0 = row_0.createCell(0);
		// 数据域个数
		cell0.setCellValue("数据域个数");
		cell0.setCellStyle(cell_style);

		// 第二行赋值操作
		HSSFRow row_1 = sheet.createRow(1);
		row_1.createCell(0).setCellValue(10);
		
		// 第三行赋值
		HSSFRow row_2 = sheet.createRow(2);
		HSSFCell cell_2_0 = row_2.createCell(0);
		cell_2_0.setCellValue("服务编号");
		cell_2_0.setCellStyle(cell_style);
		HSSFCell cell_2_1 = row_2.createCell(1);
		cell_2_1.setCellValue("服务请求方代码");
		cell_2_1.setCellStyle(cell_style);
		HSSFCell cell_2_2 = row_2.createCell(2);
		cell_2_2.setCellValue("授权标志");
		cell_2_2.setCellStyle(cell_style);
		
		// 第四行往后用查询数据填充
		int row_num = 3;
		for (ServAuthBean data_bean : data_list) {
			HSSFRow row = sheet.createRow(row_num);
			row.createCell(0).setCellValue(data_bean.getServ_id());
			row.createCell(1).setCellValue(data_bean.getApps_sys_id());
			row.createCell(2).setCellValue(data_bean.getStatus());
			row_num++;
		}
		
		//文件名
		String file_name = "授权.xls";
		
		FileOutputStream fos = null;
		try {
			fos = new FileOutputStream(file_name);
			try {
				workbook.write(fos);
			} catch (IOException e) {
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} finally {
			try {
				if(workbook != null) {
					workbook.close();
				}
				if(fos != null) {
					fos.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

　最近项目遇到用POI导出文件，碰到关于excel单元格样式的问题，谨记录一波！