利用XSSFWorkbook 来生成.xlsx类型的Excel表格

以下是一个demo：

    @RequestMapping("/downExample")
	public void downExample(HttpServletResponse response,HttpServletRequest request){  
    	String advProJson = request.getParameter("advProJson");
    	List advProList = JsonChangeUtil.jsonToList(advProJson, AdvProEntity.class);   	
		XSSFWorkbook wb = new XSSFWorkbook();
		XSSFSheet sheet = wb.createSheet("报表");
		XSSFCellStyle style = wb.createCellStyle();
		//设置style---cell中水平的对齐方式
		style.setAlignment(HorizontalAlignment.CENTER);
		//设置style---cell中垂直方向的对齐方式
		style.setVerticalAlignment(VerticalAlignment.CENTER);
		//合并单元格  参数说明：1：开始行 2：结束行  3：开始列 4：结束列  
		sheet.addMergedRegion(new CellRangeAddress(0,0,0,8));
		sheet.addMergedRegion(new CellRangeAddress(1,2,8,8));
		XSSFRow row = sheet.createRow(0);
		XSSFCell cell = row.createCell(0);
		cell.setCellValue("报表报告");
		cell.setCellStyle(style);
		row = sheet.createRow(1);
		for(int i=0;i<9;i++){
			//设置列宽
			sheet.setColumnWidth(i, 4000);
			//设置行高
			//row.setHeight((short)1000);
			if(i==0){
				cell = row.createCell(0);
				cell.setCellValue("日期");
				cell.setCellStyle(style);
			}else if(i==8){
				cell = row.createCell(i);
				cell.setCellValue("TOTAL");
				cell.setCellStyle(style);
			}else{				
	            Calendar calendar = Calendar.getInstance();  
	            calendar.setTime(new Date());
	            calendar.add(Calendar.DAY_OF_MONTH, -6+i-1);            
	            String date = DateFormatUtils.format(calendar.getTime(), "yyyy-MM-dd");
				cell = row.createCell(i);
				cell.setCellValue(date);
				cell.setCellStyle(style);
			}
		}
		row = sheet.createRow(2);
		for(int i=0;i<9;i++){
			if(i==0){
				cell = row.createCell(i);
				cell.setCellValue("时段");
				cell.setCellStyle(style);
			}else{
				cell = row.createCell(i);
				cell.setCellValue("数据");
				cell.setCellStyle(style);
			}
		}
		
		for(int k=0;k<24;k++){
			row = sheet.createRow(2+1+k);
			cell = row.createCell(0);
			cell.setCellValue(String.valueOf(k)+":00-"+String.valueOf(k)+":59");
			cell.setCellStyle(style);
			for(int g=0;g<8;g++){
				cell = row.createCell(1+g);
				cell.setCellValue(advProList.get(k).getMap().get(String.valueOf(g)));
				cell.setCellStyle(style);
			}	
		}
		
		try {
			response.setHeader("content-Disposition","attachment;filename="
					+ URLEncoder.encode("报表.xlsx","utf-8"));
			OutputStream out = response.getOutputStream();
			wb.write(out);
			out.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}