Liferay 6.2 How to display images stored in Documents and Media

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());

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

回答1:

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();
}

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.

回答2:

I think this can help you

<%@ page import="com.liferay.portlet.documentlibrary.model.DLFolder" %>
<%@ page import="com.liferay.portlet.documentlibrary.service.DLFolderLocalServiceUtil" %>
<%@ page import="com.liferay.portlet.documentlibrary.service.DLFileEntryLocalServiceUtil" %>
<%@ page import="com.liferay.portlet.documentlibrary.model.DLFileEntry" %>
<%@ page import="java.util.List" %>
<%@ page import="com.liferay.portlet.imagegallery.service.IGImageLocalServiceUtil" %>
<%@ page import="com.liferay.portlet.imagegallery.model.IGImage" %>

<%@ include file="init.jsp" %>

<%
    String igFolderId = portletPreferences.getValue("igFolderId", "0");
    String cycleSpeed = portletPreferences.getValue("cycleSpeed", "1000");
    String fxSpeed = portletPreferences.getValue("fxSpeed", "1000");
    String type = portletPreferences.getValue("type", "fade");
    String height = portletPreferences.getValue("height", "480");
    String width = portletPreferences.getValue("width", "640");

    List<IGImage> images = IGImageLocalServiceUtil.getImages(Long.valueOf(igFolderId));
%>

<c:choose>
    <c:when test="<%= Long.valueOf(igFolderId) != 0%>">
        <div id="<portlet:namespace />images">
            <%
                for (int i = 0; i < images.size(); i++)  {
                    IGImage image = images.get(i);
            %>
                <img width="<%= width %>" height="<%= height %>" src="/image/image_gallery?img_id=<%=image.getLargeImageId()%>" alt="<%=image.getDescription()%>" <%= i == 0 ? "" : "style=\"display:none;\""%>/>
            <%
                }
            %>
        </div>
    </c:when>
    <c:otherwise>
        <span class="portlet-msg-info">
            Please configure this portlet.
        </span>
    </c:otherwise>
</c:choose>

<script type="text/javascript">
    jQuery(
        function() {
            jQuery("#<portlet:namespace />images").cycle({
                fx:    '<%= type %>',
                speed:  <%= fxSpeed %>,
                timeout: <%= cycleSpeed %>
             });
        }
    );
</script>

Greetings!

来源：https://stackoverflow.com/questions/36863921/liferay-6-2-how-to-display-images-stored-in-documents-and-media

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