Liferay7 BPM门户开发之35: AssetTag的集成查询

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Tag是liferay中的Asset特性，可以用来对信息进行分类，在iferay中的Asset类型为：

1、 Web Content（自定义内容）
2、 Documents and Media(文档库和媒体文件)
3、 Blogs （博客文章）
4、 Message Boards
5、 Wiki Page
6、 Bookmarks

可以根据tagName来对信息进行归类统计，演示代码：

//查询Tag的数量（符合tagName=‘news’）
ThemeDisplay themeDisplay = (ThemeDisplay)renderRequest.getAttribute(WebKeys.THEME_DISPLAY);
String tagName = "news";
try {
AssetTag assetTag = AssetTagLocalServiceUtil.getTag(themeDisplay.getScopeGroupId(), tagName);
int assetCount = assetTag.getAssetCount();
System.out.println("Tage name: "+tagName);
System.out.println("Number of associated assets: "+assetCount);} catch (PortalException e) {
e.printStackTrace();
} catch (SystemException e) {
e.printStackTrace();
}//=======================
//查询all assets （by tagName）

ThemeDisplay themeDisplay = (ThemeDisplay) renderRequest
.getAttribute(WebKeys.THEME_DISPLAY);
String tagName = "news";
try {
AssetTag assetTag = AssetTagLocalServiceUtil.getTag(themeDisplay.getScopeGroupId(), tagName);AssetEntryQuery assetEntryQuery = new AssetEntryQuery();
long[] tagIds = { assetTag.getTagId() };
assetEntryQuery.setAnyTagIds(tagIds);
List<AssetEntry> assetEntryList = AssetEntryLocalServiceUtil.getEntries(assetEntryQuery);
for (AssetEntry assetEntry : assetEntryList) {
//Here all the logic will go
......
}
} catch (PortalException e) {
e.printStackTrace();
} catch (SystemException e) {
e.printStackTrace();
}//=======================
//查询JournalArticle所有符合tagName=‘news’的文章
//备注：JournalArticle是liferay内置的一种Web CMS Content，利用它可以做新闻类的展示
ThemeDisplay themeDisplay = (ThemeDisplay) renderRequest
.getAttribute(WebKeys.THEME_DISPLAY);
String tagName = "news";
try {
AssetTag assetTag = AssetTagLocalServiceUtil.getTag(themeDisplay.getScopeGroupId(), tagName);AssetEntryQuery assetEntryQuery = new AssetEntryQuery();
long[] tagIds = { assetTag.getTagId() };
assetEntryQuery.setAnyTagIds(tagIds);
assetEntryQuery.setClassName(JournalArticle.class.getName());
List<AssetEntry> assetEntryList = AssetEntryLocalServiceUtil.getEntries(assetEntryQuery);
//开始遍历JournalArticle
for (AssetEntry assetEntry : assetEntryList) { 
JournalArticleResource journalArticleResource = JournalArticleResourceLocalServiceUtil.getJournalArticleResource(assetEntry.getClassPK());
JournalArticle journalArticle = JournalArticleLocalServiceUtil.getArticle(journalArticleResource.getGroupId(),journalArticleResource.getArticleId());
System.out.println("Journal Article Title: "+journalArticle.getTitle(themeDisplay.getLocale()));
}
} catch (PortalException e) {
e.printStackTrace();
} catch (SystemException e) {
e.printStackTrace();
}//=======================
//查询所有符合tagName=‘news’的书签等信息

ThemeDisplay themeDisplay = (ThemeDisplay) renderRequest.getAttribute(WebKeys.THEME_DISPLAY);
String tagName = "news";
try {
AssetTag assetTag = AssetTagLocalServiceUtil.getTag(themeDisplay.getScopeGroupId(), tagName);
AssetEntryQuery assetEntryQuery = new AssetEntryQuery();
long[] tagIds = { assetTag.getTagId() };
assetEntryQuery.setAnyTagIds(tagIds);
/**
*  Bookmarks
*/
assetEntryQuery.setClassName(BookmarksEntry.class.getName());
List<AssetEntry> assetEntryList = AssetEntryLocalServiceUtil.getEntries(assetEntryQuery);
for (AssetEntry assetEntry : assetEntryList) {BookmarksEntry bookmarksEntry = BookmarksEntryLocalServiceUtil.getBookmarksEntry(assetEntry.getClassPK());
....to do something}
/**
*  Blogs
*/
assetEntryQuery.setClassName(BlogsEntry.class.getName());
assetEntryList = AssetEntryLocalServiceUtil.getEntries(assetEntryQuery);
for (AssetEntry assetEntry : assetEntryList) {
BlogsEntry BlogsEntry = BlogsEntryLocalServiceUtil.getBlogsEntry(assetEntry.getClassPK());
....to do something}/**
*  Documents and media
*/
assetEntryQuery.setClassName(DLFileEntry.class.getName());
assetEntryList = AssetEntryLocalServiceUtil.getEntries(assetEntryQuery);
for (AssetEntry assetEntry : assetEntryList) {
DLFileEntry dLFileEntry = DLFileEntryLocalServiceUtil.getDLFileEntry(assetEntry.getClassPK());
....to do something}
} catch (PortalException e) {
e.printStackTrace();
} catch (SystemException e) {
e.printStackTrace();
}