从 CMIS 如何获取 Alfresco 的缩略图占位符? [英] From CMIS how do I get the thumbnail placeholder for Alfresco?

问题描述

我知道，如果没有缩略图，以下 URL 将为我提供文档的缩略图或占位符图像.这是因为最后的 ph=true 有效.

I understand that the following URL will give me the thumbnail of a document or the placeholder image, if there isn't a thumbnail. This works because of the ph=true at the end.

http://cms.mydomain.com:8080/share/proxy/alfresco/api/node/workspace/SpacesStore/" + childId + "/content/thumbnails/doclib?ph=true

我还发现以下服务器端代码会为我获取缩略图的 ContentStream.

I have also found that the following server side code will get me the ContentStream of the thumbnail image.

    OperationContext context = session.createOperationContext();
    context.setRenditionFilterString("cmis:thumbnail");
    CmisObject doc = session.getObject(id, context);
    List<Rendition> renditions = doc.getRenditions();
    if (renditions.size() > 0) {
        Rendition rend = renditions.get(0);
        cs = rend.getContentStream();
    }

问题在于，如果没有缩略图(如第一个 URL)，它不会返回占位符图像.

The problem with this is it does not return the placeholder image if there isn't a thumbnail, like the first URL.

对于服务器端，如果没有缩略图，我将如何检索适当的占位符图像?例如 docx 和 xlsx 文件.

For the server side how would I retrieve the appropriate placeholder image when there isn't a thumbnail? For example for docx and xlsx files.

谢谢，乔恩

推荐答案

我认为在这种情况下，检索缩略图(doclib 或占位符)的最有效方法是直接调用 REST Alfresco 服务.

I think in this case the most effective way to retrieve thumbnails (doclib or a placeholder) is to call directly the REST Alfresco Service.

我不是 100% 肯定，但来自 Alfresco 服务器的 CMIS 再现响应仅包含现有再现.CMIS 再现部分中没有像 Alfresco REST url 提供的占位符那样提供占位符.

I'm not 100% sure but CMIS rendition response from an Alfresco Server contains only existing renditions. There's no placeholder provided in CMIS renditions part like the one provided by the Alfresco REST url.

这篇关于从 CMIS 如何获取 Alfresco 的缩略图占位符?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！