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文件预览下载问题相关

关于文件的下载及预览目前我了解的有2种处理方式，一种方式是通过虚拟路径的方式进行处理，这种方式需要涉及的代码少，但是会需要一定的服务器配置，将文件以静态资源的方式进行管理，访问权限上，springMVC应该有对静态资源权限管理的方案，本文暂不做讨论，还有一种是通过java代码读取文件，通过接口返回文件的方式来进行管理，这样对文件权限及流都有更好的管控。

下载

    @SuppressWarnings("rawtypes")
    @RequestMapping(value = "/downattach")
    public ResponseEntity DownFileAttach(@ModelAttribute("file") FileAttach file, HttpServletResponse response) {
        ReturnValue rtv = new ReturnValue();

        try {
            FileAttach item = PubDao.GetFileAttach(file);

            String path = FileUtils.GetFileBasePath();

            File df = new File(path + item.getAttachurl());
            HttpHeaders headers = new HttpHeaders();

            if (file.getDowntype().equals("attach")) {
                headers.setContentDispositionFormData("attachment", new String(item.getAttachname().getBytes("UTF-8"), "iso-8859-1"));
                headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            }
            else {
                switch (FileUtils.GetFileType(item.getAttachurl())) {
                    case WORD:
                        headers.add("Content-Disposition", "inline;filename=" + new String(item.getAttachname().getBytes("UTF-8"), "iso-8859-1"));
                        headers.add("Content-Type", "application/vnd.ms-word");
                        break;

                    case EXCEL:
                        headers.add("Content-Disposition", "inline;filename=" + new String(item.getAttachname().getBytes("UTF-8"), "iso-8859-1"));
                        headers.add("Content-Type", "application/vnd.ms-excel");
                        break;

                    case PPT:
                        headers.add("Content-Disposition", "inline;filename=" + new String(item.getAttachname().getBytes("UTF-8"), "iso-8859-1"));
                        headers.add("Content-Type", "application/vnd.ms-powerpoint");
                        break;

                    case PDF:
                        headers.add("Content-Disposition", "inline;filename=" + new String(item.getAttachname().getBytes("UTF-8"), "iso-8859-1"));
                        headers.add("Content-Type", "application/pdf");
                        break;

                    case IMAGE:
                        headers.add("Content-Disposition", "inline;filename=" + new String(item.getAttachname().getBytes("UTF-8"), "iso-8859-1"));
                        headers.add("Content-Type", "image/jpeg");
                        break;

                    default:
                        headers.setContentDispositionFormData("attachment", new String(item.getAttachname().getBytes("UTF-8"), "iso-8859-1"));
                        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
                        break;
                }
            }

            return new ResponseEntity<byte[]>(org.apache.commons.io.FileUtils.readFileToByteArray(df), headers,    HttpStatus.OK);
        } catch (Exception e) {
            rtv.setMsg("未能获取到资源");
        }

        return this.OutReturnBean(rtv);
    }

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