java项目附件的上传下载

文件上传：

将文件上传到服务器指定目录下，根据当前日期创建文件夹目录，文件采用uuid命名。将文件名和保存的路径存入数据库中。

@Controller
@RequestMapping("/attachment")
public class AttachmentController {
    @Value("${upload.path}")
    private String uploadPath;

    private Logger log = Logger.getLogger(this.getClass());
    @Autowired
    BasAttachmentService attachmentService;
    /**
     * 上传单个附件文件
     */
    @ResponseBody
    @RequestMapping(value = "/uploadOne", method = RequestMethod.POST)
    public Object uploadOne( @RequestParam("file") MultipartFile partFile, HttpServletRequest request) {
        //根据当前时间获得一个路径
        StringBuilder path=new StringBuilder();
        Date data=new Date();
        path.append("//").append(DateUtil.format(data, "yyyy"));
        path.append("//").append(DateUtil.format(data, "MM"));
        path.append("//").append(DateUtil.format(data, "dd"));
        String time=DateUtil.format(data,"yyyyMMdd");
        path.append("//").append(time);
        String uuid = UUID.randomUUID().toString().replaceAll("-","");
        path.append(uuid);
        File file= new File(uploadPath+path);
        try {
            InputStream inputStream = partFile.getInputStream();//获取文件流
            FileUtils.copyInputStreamToFile(inputStream, file);//将文件拷贝到指定目录下
        } catch (IOException e) {
            e.printStackTrace();
            return PageReturn.fail("获取文件流异常");
        }
        String fileName = partFile.getOriginalFilename();//上传的文件名称
        BasAttachment attachment=new BasAttachment();
        attachment.setName(fileName);
        attachment.setFileName(time+uuid);
        attachment.setFilePath(path.toString());
        attachment.setFileSize(file.length());
        attachment.setCreateTime(new Date());
        attachmentService.save(attachment);
        return PageReturn.successData(attachment);
    }
}

　　

 

下载文件：

通过文件名从数据库中找到附件对象，根据存储的路径找到对应的文件，将文件进行下载。

 /**
     * 下载单个文件
     */
    @ResponseBody
    @RequestMapping(value = "/downLoad/{fileName}")
    public void downSingle(HttpServletRequest request, HttpServletResponse response, @PathVariable(value = "fileName") String fileName)  {
        if(StringUtil.isEmpty(fileName))throw new MyException("文件名字不能为空");
        BasAttachment attachment=attachmentService.findByFileName(fileName);
        if(attachment==null) throw new MyException("文件名称错误");
        String name=attachment.getName();
        String filePath=attachment.getFilePath();
        File file=new File(uploadPath+filePath);
        try {
            String userAgent = request.getHeader("user-agent").toLowerCase();
            String downloadFileName;
            if (userAgent.contains("msie") || userAgent.contains("like gecko") ) {
                // win10 ie edge 浏览器 和其他系统的ie
                downloadFileName = URLEncoder.encode(name, "UTF-8");
            } else {
                // fe
                downloadFileName = new String(name.getBytes("UTF-8"), "iso-8859-1");
            }
            response.addHeader("content-disposition", "attachment;filename="+downloadFileName);
            FileUtils.copyFile(file, response.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
            throw new MyException("下载附件异常");
        }
    }

　　

项目代码见：

https://github.com/wxb100200/wang-base.git