解决乱码

String fileName = URLEncoder.encode(atta.getFileName(), "UTF-8");
       
        if (fileName.length() > 150) {
            String guessCharset = xxxx /*根据request的locale 得出可能的编码，中文操作系统通常是gb2312*/
            fileName = new String(atta.getFileName().getBytes(guessCharset), "ISO8859-1"); 
        }
        response.setHeader("Content-Disposition", "attachment; filename=" + fileName);


if(request.getHeader("user-agent").indexOf("MSIE") != -1) {  
        dfileName = java.net.URLEncoder.encode(sheetTitle,"utf-8") + ".xls";  
} else {  
        dfileName = new String(sheetTitle.getBytes("utf-8"),"iso-8859-1") + ".xls";  
}  
response.setHeader("Content-disposition", "attachment;filename=" + dfileName);