Liferay分页新闻列表（Journal Articles二次开发）

Liferay中自带了News的功能，可能是太高档了，到现在我都不是很清楚那个News功能的具体作用。

项目中需要用到新闻列表，只需要显示新闻标题，发布时间，有分页功能，可以通过标题上的链接查看新闻详细。

为了偷懒，就用Liferay的CMS中的Journal Articles即日志文章来实现。新闻可以通过CMS录入，这样我们在新增新闻的时候不仅可以指定新闻的类型，而且还可以通过Journal Articles现有的功能来配置显示的相关信息，同时还可以省掉新闻文章搜索的功能，方便不少哦。

好处很多，但是通常有一点达不到客户的要求，可能就需要重新开发，实际情况是Liferay中的Journal Articles并不带有分页功能。如何让他具备分页的功能呢？查看SOURCE决定在其现有的功能上扩展，保留其自身的功能作简单的配置即可。

一、目标：在Liferay的“增加内容”列表的新闻菜单下增加一个“日志新闻”的Portlet
打开liferay-display.xml文件，找到category.news的部分，新增一个id为 journal_news的portlet，以下是修改后的代码

xml 代码

1. <category name="category.news">
2. <portlet id="4" />
3. <portlet id="5" />
4. <portlet id="39" />
5. <portlet id="journal_news" />
6. category>

上面的配置信息表示在种类为 news的菜单下，有4个portlet可以供用户选择。现在增加了 一个 id为journal_news的portlet，实际上那只是配置上的设定， journal_news并没有实际 存在。

二、打开liferay-portlet-ext.xml文件，新增portlet的配置信息，新增后如下：

xml 代码

1. <portlet>
2. <portlet-name>journal_newsportlet-name>
3. <icon>/html/portlet/journal_articles/icon.pngicon>
4. <struts-path>journal_articlesstruts-path>
5. <configuration-action-class>com.liferay.portlet.journalarticles.action.ConfigurationActionImplconfiguration-action-class>
6. <use-default-template>falseuse-default-template>
7. <restore-current-view>falserestore-current-view>
8. <instanceable>trueinstanceable>
9. <private-request-attributes>falseprivate-request-attributes>
10. <private-session-attributes>falseprivate-session-attributes>
11. <render-weight>0render-weight>
12. portlet>

可能有人看到了，上面的配置信息和journal_articles的配置几乎完全相同，只是名称换了一下。既然要使用 journal_articles现有的功能，最简单的当然是直接依葫芦画瓢。

三、打开portlet-ext.xml文件，新增以下内容。

xml 代码

1. <portlet>
2. <portlet-name>journal_newsportlet-name>
3. <display-name>Journal_Newsdisplay-name>
4. <portlet-class>com.liferay.portlet.StrutsPortletportlet-class>
5. <init-param>
6. <name>view-actionname>
7. <value>/journal_articles/view_newsvalue>
8. init-param>
9. <expiration-cache>0expiration-cache>
10. <supports>
11. <mime-type>text/htmlmime-type>
12. supports>
13. <resource-bundle>com.liferay.portlet.StrutsResourceBundleresource-bundle>
14. <security-role-ref>
15. <role-name>power-userrole-name>
16. security-role-ref>
17. <security-role-ref>
18. <role-name>userrole-name>
19. security-role-ref>
20. <portlet-info>
21. <title>Journal Newstitle>
22. portlet-info>
23. portlet>

同样也是小的变动，只是 view-action的value和 title换掉了。其他的也还是和 journal_articles一样。
实际上我们要做的只是在表现的JSP看到的效果不一样而已，重点要做的只是在JSP上。

四、struts-config-ext.xml和tiles-defs-ext.xml中增加 view-action的相关设定。

struts-config-ext.xml中增加以下部分：

xml 代码

3. <action path="/journal_articles/view_news" type="com.liferay.portlet.journalarticles.action.ViewAction">
4. <forward name="portlet.journal_articles.view" path="portlet.journal_articles.view.news" />
5. action>

tiles-defs-ext.xml增加以下部分：

xml 代码

3. <definition name="portlet.journal_articles.view.news" extends="portlet">
4. <put name="portlet_content" value="/portlet/journal_articles/view_news.jsp" />
5. definition>

仅仅只是表现的JSP不同，其他功能继续沿用。

五、在${CATALINA_HOME}/WABAPPS/ROOT/HTML/portlet/journal_articles目录下新增view_news.jsp，你也可以在开发环境的相关目录中新增该文件，然后通过ANT工具部署到这个这个目录中去。

xml 代码

1. <%
2. /**
3. * Copyright (c) 2000-2007 Liferay, Inc. All rights reserved.
4. *
5. * Permission is hereby granted, free of charge, to any person obtaining a copy
6. * of this software and associated documentation files (the "Software"), to deal
7. * in the Software without restriction, including without limitation the rights
8. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9. * copies of the Software, and to permit persons to whom the Software is
10. * furnished to do so, subject to the following conditions:
11. *
12. * The above copyright notice and this permission notice shall be included in
13. * all copies or substantial portions of the Software.
14. *
15. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21. * SOFTWARE.
22. */
23. %>
24. <%@ page import="com.liferay.portlet.journal.NoSuchArticleException"%>
25. <%@ include file="/html/portlet/journal_articles/init.jsp" %>
27. <%
28. String cur = ParamUtil.getString(request, "cur");
29. String articleId = ParamUtil.getString(request, "articleId");
30. boolean tag = Validator.isNull(articleId);
31. if(!cur.equals(""))
32. {
33. //新增cur变量，根据该变量的取值来确定是否为分页操作
34. tag=true;
35. }
36. double version = ParamUtil.getDouble(request, "version");
37. %>
39. <c:choose>
40. <c:when test="<%= tag %>">
42. <%
43. if (Validator.isNull(type)) {
44. type = null;
45. }
47. String status = "approved";
49. PortletURL portletURL = renderResponse.createRenderURL();
51. portletURL.setWindowState(WindowState.NORMAL);
53. //相关path也做了同样的变动
54. portletURL.setParameter("struts_action", "/journal_articles/view_news");
56. ArticleSearch searchContainer = new ArticleSearch(renderRequest, portletURL);
58. searchContainer.setDelta(pageDelta);
60. List headerNames = searchContainer.getHeaderNames();
62. headerNames.clear();
63. //新闻列表不需要title，因此注释掉。
64. //headerNames.add("name");
65. //headerNames.add("display-date");
66. //headerNames.add("author");
68. searchContainer.setOrderableHeaders(null);
70. ArticleSearchTerms searchTerms = (ArticleSearchTerms)searchContainer.getSearchTerms();
72. searchTerms.setGroupId(groupId);
73. searchTerms.setType(type);
74. searchTerms.setStatus("approved");
75. %>
78. <form action="<%=portletURL %>" method="post" name=" <portlet:namespace>fm"</portlet:namespace> >
80. <%@ include file="/html/portlet/journal/article_search_results.jspf" %>
82. <%
83. List resultRows = searchContainer.getResultRows();
85. for (int i = 0; i < results.size(); i++) {
86. JournalArticle article = (JournalArticle)results.get(i);
88. ResultRow row = new ResultRow(article, article.getArticleId() + EditArticleAction.VERSION_SEPARATOR + article.getVersion(), i);
90. String rowHREF = null;
92. if (pageURL.equals("popUp")) {
93. StringMaker sm = new StringMaker();
95. sm.append(themeDisplay.getPathMain());
96. sm.append("/journal_articles/view_article_content?groupId=");
97. sm.append(article.getGroupId());
98. sm.append("&articleId=");
99. sm.append(article.getArticleId());
100. sm.append("&version=");
101. sm.append(article.getVersion());
103. rowHREF = sm.toString();
104. }
105. else {
106. portletURL.setParameter("groupId", String.valueOf(article.getGroupId()));
107. portletURL.setParameter("articleId", article.getArticleId());
108. portletURL.setParameter("version", String.valueOf(article.getVersion()));
110. rowHREF = portletURL.toString();
111. }
113. String target = null;
115. if (pageURL.equals("popUp")) {
116. target = "_blank";;
117. }
119. TextSearchEntry rowTextEntry = new TextSearchEntry(SearchEntry.DEFAULT_ALIGN, SearchEntry.DEFAULT_VALIGN, article.getArticleId(), rowHREF, target, null);
121. /*// Article id
123. row.addText(rowTextEntry);
125. // Version
127. rowTextEntry = (TextSearchEntry)rowTextEntry.clone();
129. rowTextEntry.setName(String.valueOf(article.getVersion()));
131. row.addText(rowTextEntry);*/
133. // Title
135. rowTextEntry = (TextSearchEntry)rowTextEntry.clone();
137. rowTextEntry.setName(article.getTitle());
139. row.addText(rowTextEntry);
141. // Display date
143. rowTextEntry = (TextSearchEntry)rowTextEntry.clone();
145. rowTextEntry.setName(dateFormatDateTime.format(article.getDisplayDate()));
147. row.addText(rowTextEntry);
149. // Author
151. //rowTextEntry = (TextSearchEntry)rowTextEntry.clone();
153. //rowTextEntry.setName(PortalUtil.getUserName(article.getUserId(), article.getUserName()));
155. //row.addText(rowTextEntry);
157. // Add result row
159. resultRows.add(row);
160. }
161. %>
163. <liferay-ui:search-iterator searchContainer="<%= searchContainer %>" />
165. <liferay-ui:search-paginator searchContainer="<%= searchContainer %>" />
166. form>
167. c:when>
168. <c:otherwise>
170. <%
171. String languageId = LanguageUtil.getLanguageId(request);
173. String content = JournalArticleLocalServiceUtil.getArticleContent(groupId, articleId, version, languageId, themeDisplay);
175. RuntimeLogic portletLogic = new PortletLogic(application, request, response, renderRequest, renderResponse);
176. RuntimeLogic actionURLLogic = new ActionURLLogic(renderResponse);
177. RuntimeLogic renderURLLogic = new RenderURLLogic(renderResponse);
179. content = RuntimePortletUtil.processXML(request, content, portletLogic);
180. content = RuntimePortletUtil.processXML(request, content, actionURLLogic);
181. content = RuntimePortletUtil.processXML(request, content, renderURLLogic);
182. %>
184. <%= content %>
185. c:otherwise>
186. c:choose>

做相关部署，重启服务器。。。附件中有view_news.jsp