servlet文件下载和jspsmartupload上传

SmartUpload smart = new SmartUpload();
            org.lxh.smart.Request re = smart.getRequest();
            smart.initialize(pageContext);
            smart.upload();
            String ext = smart.getFiles().getFile(0).getFileExt();
            Time time = new Time(request.getRemoteAddr());
            //Time time = new Time("127.0.0.1");
            String fileName = time.getIPTimeRand() + "." + "docx";
            String path = getServletContext().getRealPath("/")+"teacher" 
                    + java.io.File.separator + fileName;
            smart.getFiles().getFile(0).saveAs(path);

String path = request.getParameter("path");
        String name = request.getParameter("name");
        File f = new File(path);
         if(f.exists()){  
                       FileInputStream  fis = new FileInputStream(f);  
                       byte[] b = new byte[fis.available()];  
                       fis.read(b);  
                       response.setCharacterEncoding("gbk");  
                        response.setHeader("Content-Disposition","attachment; filename="+name+".docx");  
                        //获取响应报文输出流对象   
                         ServletOutputStream  out =response.getOutputStream();  
                         //输出   
                         out.write(b);  
                         out.flush();  
                         out.close();  
                                  
                             
                         }