jxl导出报表选择保存路径
//Excel文件名
String planTitle="salerOrder";
String fileName=DateTime.getCurrtDateTime("yyyMM")+ "-" + planTitle;

OutputStream outputStream = response.getOutputStream();//取得输出流
// 清空输出流
response.reset();
// 定义输出类型
response.setContentType("application/msexcel");
// 汉字文件名
fileName = new String(fileName.getBytes("gb2312"), "iso8859-1");

// 设定输出文件头
response.setHeader("Content-disposition", "attachment; filename=" + fileName + ".xls");
book= Workbook.createWorkbook(outputStream);