Liferay 6.2如何显示文档和媒体中存储的图像 [英] Liferay 6.2 How to display images stored in Documents and Media

问题描述

我想知道在自定义portlet的jsp中显示DLFileEntry图像的所有可能方式. 更具体地说，我目前使用以下方式，但DLFileEntry对象的"largeimageid"值为零，则存在一些问题

I would like to know all possible ways of displaying a DLFileEntry image in a jsp of a custom portlet. More specifically, I currently use the following way but I have some issues with DLFileEntry objects that have zero values for 'largeimageid'

DLFileEntry image = DLFileEntryLocalServiceUtil.getFileEntry(long_id);
String imageUrl = themeDisplay.getPathImage() + "/image_gallery?img_id=" + image.getLargeImageId() +  "&t=" + WebServerServletTokenUtil.getToken(image.getLargeImageId());

在不使用大图片ID的情况下获取图片网址的替代方法有哪些?

Which are the alternatives of getting the image url without use of the large image id?

推荐答案

以下是与Liferay 文档和媒体 portlet使用的模式相似的模式:

Following is the pattern similar to the one that is used by Liferay Documents and Media portlet:

DLFileEntry image = DLFileEntryLocalServiceUtil.getFileEntry(long_id);
String imageUrl = "";
if (image != null) {
    imageUrl =
        PortalUtil.getPortalURL(request) + "/documents/" + image.getGroupId() + "/" +
            image.getFolderId() + "/" + image.getTitle() + "/" + image.getUuid() + "?t=" +
            System.currentTimeMillis();
}

PortalUtil.getPortalURL(request)将基于httpServletRequest返回门户的基本URL，System.currentTimeMillis()将为您提供当前时间(毫秒)，其余参数均可通过DLFileEntry对象使用.

Where PortalUtil.getPortalURL(request) will return you base URL of your portal based on httpServletRequest, System.currentTimeMillis() will give you current time (miliseconds), and rest of the parameters are all available through DLFileEntry object.

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