java----上传文件单独接口

图片做一个单独的

//上传图片,返回attach_id
@RequestMapping(value = "/addImg")
public BaseResponse addImg(HttpServletRequest request, @RequestParam("file") MultipartFile file, String flag) throws UnsupportedEncodingException {
    request.setCharacterEncoding("utf-8");
    BaseResponse msg = new BaseResponse();
    //做文件上传
    if ("".equals(file.getName()) || file.isEmpty()) {
        new BizException(ErrorCode.WRONG_FILE_FULL.getDesc());
    }
    if (file.getSize() > 3000000) {
        new BizException(ErrorCode.WRONG_FILE_UPLOAD_PASS.getDesc());
    }
    //附件对象
    Attach attach = new Attach();
    String path = uploadPath + File.separator;
    File dir = new File(path);
    if (!dir.exists()) {
        dir.mkdirs();
    }
    long attach_id = Long.valueOf(0);
    //判断文件
    if (!file.isEmpty()) {
        //上传的文件的名称
        String oldFileName = file.getOriginalFilename();
        attach.setName(oldFileName.substring(0, oldFileName.lastIndexOf(".")));
        //取文件名的后缀
        String suffix = oldFileName.substring(oldFileName.lastIndexOf("."));
        //判断文件格式和类型   GIF,PNG 或JPG
        if (".jpg".equalsIgnoreCase(suffix)) {
            attach.setType("jpg");
        } else if (".png".equalsIgnoreCase(suffix)) {
            attach.setType("png");
        } else if (".gif".equalsIgnoreCase(suffix)) {
            attach.setType("gif");
        } else if (".doc".equalsIgnoreCase(suffix)) {
            attach.setType("doc");
        } else if (".word".equalsIgnoreCase(suffix)) {
            attach.setType("word");
        } else if (".pdf".equalsIgnoreCase(suffix)) {
            attach.setType("pdf");
        } else if (".docx".equalsIgnoreCase(suffix)) {
            attach.setType("docx");
        } else {
            new BizException(ErrorCode.WRONG_FILE_UPLOAD_FORMAT.getDesc());
        }
        Long id = Utils.nextId();
        //新的文件名
        String fileName = id + suffix;
        path = path + fileName;
        attach.setAddress(path);
        attach.setFlag(flag);
        attach.setTime(Utils.getDate());
        //文件保存路径
        File savePath = new File(path);
        //设置附件路径
        try {
            attach_id = attachService.addAttach(attach);
            //通过封装好的方法将文件上传到指定的文件夹
            file.transferTo(savePath);
        } catch (IOException e) {
            new BizException(ErrorCode.WRONG_FILE_UPLOAD.getDesc());
        }
    }
    msg.setData(attach_id);
    msg.setSuccess(true);
    return msg;
}