使用Springmvc实现文件上传

@RequestMapping(value="/userfilesDownload/{fileId}")
	public ResponseEntity<byte[]> UserfilesDownload(@RequestParam("file")String file,@PathVariable String fileId,HttpServletRequest request,HttpServletResponse response)throws IOException{
		//获得所有请求的路径
		String filepath = request.getServletContext().getRealPath("/");
		File newfile=null;
		HttpHeaders headers=null;
		try{
//filepath+File.separator+file拼接访问路径 ——多出来了一个/crpies
		newfile=new File(filepath+File.separator+file);
//转码  防止文件名乱码
		String filename1=new String(filepath.getBytes("utf-8"),"ISO-8859-1");
		headers=new HttpHeaders();
		//格式化文件
		headers.setContentDispositionFormData("attachment", filename1);
		//用二进制流来下载地址
		headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
		}catch(Exception e){
			throw new RuntimeException(e);
		}
		return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(newfile),headers, HttpStatus.OK); 
	}

文件下载

List<Enclosure> fileList=enclosureService.getListByFileIds(fileId);
		String fileDownUrl="";
		String filename="";
		for (Enclosure enclosure : fileList) {
			fileDownUrl=enclosure.getDownloadPath();
			filename=enclosure.getName();
		}
		File file = new File(Global.getUserfilesBaseDir() + Global.USERFILES_BASE_URL + fileDownUrl);
		if (file.exists()) {
            resp.setContentType("application/force-download");// 设置强制下载不打开
            resp.addHeader("Content-Disposition",
                    "attachment;fileName=" + filename);// 设置文件名
            byte[] buffer = new byte[1024];
            FileInputStream fis = null;
            BufferedInputStream bis = null;
            try {
                fis = new FileInputStream(file);
                bis = new BufferedInputStream(fis);
                OutputStream os = resp.getOutputStream();
                int i = bis.read(buffer);
                while (i != -1) {
                    os.write(buffer, 0, i);
                    i = bis.read(buffer);
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (bis != null) {
                    try {
                        bis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (fis != null) {
                    try {
                        fis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }