Java导出Excel表(poi)名中文乱码问题处理

String _filename = ValidateTools.date2Str(date, "yyyyMMddHHmmss");
String filename = f_name + _filename;
HSSFSheet sheet;
HSSFCell cell;  

response.setContentType("application/x-download");//下面三行是关键代码，处理乱码问题
response.setCharacterEncoding("utf-8");
response.setHeader("Content-Disposition", "attachment;filename="+new String(filename.getBytes("gbk"), "iso8859-1")+".xls");
sheet = workbook.createSheet("sheet1");