下载poi生成的excel

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#xls格式

// 下载wb
		String fileNamestr = "文件名.xls";
		OutputStream output = null;
		try {
			response.setHeader("Content-disposition","attachment; filename=" + new String(fileNamestr.getBytes("gb2312"), "ISO8859-1" ));
			response.setCharacterEncoding("UTF-8");
			output = response.getOutputStream(); // 读取的文件路径
			response.setContentType("application/vnd.ms-excel");
			
			wb.write(output);
			output.flush();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (null != output) {
				try {
					output.close();
				} catch (Exception e1) {
					e1.printStackTrace();
				}
			}
		}

附:
1.设置cell背景色不起作用
CellStyle errStyle = sheet.getWorkbook().createCellStyle();
errStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);//设置前景填充样式
errStyle.setFillForegroundColor(HSSFColor.RED.index);
errStyle.setFillBackgroundColor(HSSFColor.RED.index);

2.cell中填充的数值设置为文本样式
CellStyle textCellStyle = wb.createCellStyle(); 
        DataFormat format = wb.createDataFormat(); 
        textCellStyle.setDataFormat(format.getFormat("@"));