无法预览的不显示预览按钮

6c

2026-03-04 bb4857fdf86492437e4e6431c01c143ad571a2d9

 src/main/java/com/product/file/service/FileManagerService.java

@@ -266,6 +266,11 @@
         return false;
      }

        // 存放在数据库中的文件，直接判定是否有值
        if (attachmentFse.getValue(CmnConst.FILE_CONTENT) != null) {
            return true;
        }

      //判断文件存放在服务器还是本地
      boolean needDownloadFromServerFlag = "1".equals(attachmentFse.getString(CmnConst.UPLOAD_SIGN));
      String dir = attachmentFse.getString(CmnConst.ATTACHMENT_URL);
@@ -886,6 +891,7 @@
                    if (saveInDb) {
                        File localFile = new File(Global.getSystemConfig("local.dir", "") + File.separator + attachmentFse.getString(CmnConst.ATTACHMENT_URL) + File.separator + fileName);
                        if (!localFile.exists()) {
                            localFile.getParentFile().mkdirs();
                            Files.copy(is, localFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
                        }
                    }
@@ -1024,13 +1030,22 @@
               ftpService.downloadFile(path, os);
            }
         } else {
            // 直接在本地的目录中找文件
            String localBasePath = Global.getSystemConfig("local.dir", "");
            path = localBasePath + File.separator + path;
            File file = new File(path);
            int len;
            byte[] b = new byte[1024];
            try (InputStream is = new FileInputStream(file)) {
                InputStream is = null;
                try {
                    Object fileContent = attachmentFse.getValue("file_content");
                    boolean saveInDb = fileContent != null;
                    if (saveInDb) {
                        // 存储到数据库
                        is = (InputStream) fileContent;
                    } else {
                        // 直接在本地的目录中找文件
                        String localBasePath = Global.getSystemConfig("local.dir", "");
                        path = localBasePath + File.separator + path;
                        File file = new File(path);
                        is = Files.newInputStream(file.toPath());
                    }
                    int len;
                    byte[] b = new byte[1024];
               while ((len = is.read(b)) > 0) {
                  if (Global.getPropertyToBoolean("file.encrypt", "true")) {
                     // 需要解密
@@ -1040,7 +1055,13 @@
                     os.write(b, 0, len);
                  }
               }
            }
            } catch (Exception e) {
                    throw new BaseException(FileCode.GET_FILE_BYTES_FAIL);
                } finally {
                    if (is != null) {
                        is.close();
                    }
                }
         }

         return os.toByteArray();
@@ -1229,4 +1250,28 @@
      return flag;
   }

    /**
     * 验证是否可以预览
     * @param fse
     * @return
     */
    public Object checkPreview(FieldSetEntity fse) {
        String fileName = fse.getString("file_name");
        boolean allowPreviewFlag = Global.getPropertyToBoolean("file.view.online", "true");
        List<String> canTransferFormatList = Lists.newArrayList(Arrays.asList(Global.getSystemConfig("can.transfer.format", "").split(",")));
        List<String> canDirectPreviewList = Lists.newArrayList(Arrays.asList(Global.getSystemConfig("can.direct.view.online.format", "").split(",")));
        List<String> canPreviewList = Lists.newArrayList();
        canPreviewList.addAll(canTransferFormatList);
        canPreviewList.addAll(canDirectPreviewList);
        if (StringUtils.isEmpty(fileName)) {
            if (allowPreviewFlag) {
                return BaseUtil.collection2String(canPreviewList);
            } else {
                return "";
            }
        } else {
            String tail = fileName.substring(fileName.lastIndexOf(".") + 1);
            return allowPreviewFlag && canPreviewList.contains(tail);
        }
    }
}