java从FTP下载文件功能

java下载文件功能，导出的时候会下载到浏览器默认下载文件夹里，360浏览器会弹出一个保存文件的弹出框
//下载导出报表
//JS
function downloadExport(filename){
window.location.href=”/order-center/ui/spm/downloadExport.do?filename=”+filename;
}

/** * 查询导出报表： http://localhost:8080/order-center/ui/spm/downloadExport.do * key module */@RequestMapping(value = "downloadExport.do", method = RequestMethod.GET)public void downloadExport(        @RequestParam(value = "filename", required = false) String filename,        HttpServletResponse response) {    File pf = new File(SpmRest.class.getResource("/").getFile());    FileInputStream fis=null;    OutputStream ostream=null;    try {//          if (!getUser().getShopid().equals(EGlobal.TOP_SHOP_ID)) {////                shopId = getUser().getShopid();//              shopId = spmService.getUserShopList(getUser(),shopId);//          }        String dirPath = pf.getParentFile().getParentFile().getAbsolutePath()+ File.separator + "exportfile";        File dirFile = new File(dirPath);        if (!dirFile.exists())            dirFile.mkdir();        File file = new File(dirFile.getAbsolutePath() + File.separator                + filename);        if (!file.exists()) {//查询服务器有没有文件，没有则冲FTP下载            boolean downloadExport = spmService.downloadExport(dirPath, filename);            if(!downloadExport){                return ;            }        }        fis = new FileInputStream(file);        ostream = response.getOutputStream();        response.setContentType("application/ms-excel");        response.setHeader("Content-disposition", "attachment; filename="+ filename);        byte[] b = new byte[1024];        int len = fis.read(b);        while (len > 0) {            ostream.write(b, 0, len);            len = fis.read(b);        }       } catch (IOException e) {        e.printStackTrace();    } finally {        try {            fis.close();            ostream.close();        } catch (IOException e) {            e.printStackTrace();        }       }}/**  *  从ftp下载报表 * @throws SftpException  */public boolean downloadExport(String dirPath, String filename) {    boolean flag = false;    ChannelSftp sftp = null;    SFTPUtilTools sftptool = null;//连接FTP，自定义类，网上很多示例    try{        sftptool =  new SFTPUtilTools();        sftp = sftptool.connectChannel(FGlobal.EXPORT_HOSTNAME, FGlobal.EXPORT_USERNAME, FGlobal.EXPORT_PASSWORD);        if (sftp == null) {            logger.warn("无效链接或链接失败");            return flag;        }        logger.info("**************开始下载导出报表EXPORT**************");        sftp.cd(FGlobal.EXPORT_REC);//进入ftp下载文件夹        File file = new File(dirPath+File.separator+filename);//导出到服务器文件        sftp.get(filename,new FileOutputStream(file));//下载文件        System.out.println("文件更新成功：" + file.getName());        flag = true;        logger.info("**************下载文件成功**************");    }catch(Exception e){        logger.error(e);    }finally{        sftptool.closeChannel(sftp);    }    return flag;}