Liferay Mvc 开发（增删改查）

1、ThemeDisplay是什么意思?

在Portlet中request分为两种renderRequet和actionRequest而portlet需要取得实例Id的时候都在renderRequest的时候才可以取到，如下例子

PortletPreferences preferences = renderRequest.getPreferences();
String portletResource = ParamUtil.getString(request, "portletResource");
if (Validator.isNotNull(portletResource)) {
	preferences = PortletPreferencesFactoryUtil.getPortletSetup(request, portletResource);
	
}
其中portletResource是portlet的id 然后通过PortletPreferencesFactoryUtil工具类可以取得相应的portlet配置信息。

而在actionRequest是取不到的portlet实例的id的，actionRequest只是把当前页面所有东西传进来而已，中间经过portletAcition做了处理，如果在portletAction中做取portletId是不可取的，但是在Liferay中已经提供了这样的方法可以让我们在actionRequest中取得portlet的实例Id代码如下

 ThemeDisplay themeDisplay = (ThemeDisplay) actionRequest
		 .getAttribute(WebKeys.THEME_DISPLAY);
		 PortletDisplay portletDisplay = themeDisplay.getPortletDisplay();
		System.out.println("portletDisplay---->"+portletDisplay.getInstanceId());
		System.out.println("portletDisplay getId---->"+portletDisplay.getId());
		System.out.println("portletDisplay getPortletName---->"+portletDisplay.getPortletName());

这样就可以取到我们需要的对应的portlet实例id了

 

其中WebKeys.THEME_DISPLAY是Liferay中里面的接口常量 对应的名字是 THEME_DISPLAY

 

2、

PermissionChecker 是什么意思?

1. com.liferay.portal.kernel.portlet.LiferayPortlet.StrutsPortlet中获取方式:
2. PermissionChecker permissionChecker =
3. PermissionThreadLocal.getPermissionChecker();
6. com.liferay.portlet.journal.service.permission.JournalArticlePermission
8. 页面中:
9. JournalArticlePermission.contains(permissionChecker, article, ActionKeys.UPDATE)
11. 页面中直接拿permissionChecker对象是通过com.liferay.taglib.theme.DefineObjectsTei定义的:
12. new VariableInfo(
13. "permissionChecker", PermissionChecker.class.getName(), true,
14. VariableInfo.AT_END),
17. JournalArticlePermission:>>>>>
18. publicstaticboolean contains(
19. PermissionChecker permissionChecker, JournalArticle article,
20. String actionId) {
22. if (permissionChecker.hasOwnerPermission(
23. article.getCompanyId(), JournalArticle.class.getName(),
24. article.getResourcePrimKey(), article.getUserId(), actionId)) {
26. returntrue;
27. }
29. return permissionChecker.hasPermission(
30. article.getGroupId(), JournalArticle.class.getName(),
31. article.getResourcePrimKey(), actionId);
32. }
35. //通过ThemeDisplay也可以拿permissionChecker
36. ThemeDisplay themeDisplay = (ThemeDisplay)request.getAttribute(
37. WebKeys.THEME_DISPLAY);
39. PermissionChecker permissionChecker =
40. themeDisplay.getPermissionChecker();
41. //==================================================
43. //通过PermissionThreadLocal也可以拿permissionChecker
45. PermissionChecker permissionChecker =
46. PermissionThreadLocal.getPermissionChecker();
48. 为什么？
50. 因为>>:PermissionCheckerUtil
52. publicstaticvoid setThreadValues(User user) {
53. long userId = user.getUserId();
55. String name = String.valueOf(userId);
57. PrincipalThreadLocal.setName(name);
59. try {
60. PermissionChecker permissionChecker =
61. PermissionThreadLocal.getPermissionChecker();
63. if (permissionChecker == null) {
64. permissionChecker = (PermissionChecker)Class.forName(
65. PropsValues.PERMISSIONS_CHECKER).newInstance();
66. /**
69. PropsValues.PERMISSIONS_CHECKER
71. PropsValues>>>
72. public static final String PERMISSIONS_CHECKER =
73. PropsUtil.get(PropsKeys.PERMISSIONS_CHECKER); //就是PropsUtil.get("permissions.checker");
75. portal.properties>>>>:
76. permissions.checker=com.liferay.portal.security.permission.AdvancedPermissionChecker
77. */
78. }
80. permissionChecker.init(user, _CHECK_GUEST);
82. PermissionThreadLocal.setPermissionChecker(permissionChecker);
83. }
84. catch (Exception e) {
85. _log.error(e);
87. 什么时候在哪里会调用PermissionCheckerUtil.setThreadValues(user);呢？
89. 两个地方:
91. 1)MessageListenerImpl类的方法deliver中: PermissionCheckerUtil.setThreadValues(user);
92. 2)MailingListMessageListener类的方法processMessage中:PermissionCheckerUtil.setThreadValues(user);
95. 继续问，什么时候操作MessageListener?
96. 在MainServlet的init方法中:
98. try {
99. Iterator<Portlet> itr = portlets.iterator();
101. while (itr.hasNext()) {
102. Portlet portlet = itr.next();
104. MessageListener popMessageListener =
105. portlet.getPopMessageListenerInstance();
107. if (!portlet.isActive() || (popMessageListener == null)) {
108. continue;
109. }
111. POPServerUtil.addListener(popMessageListener);
112. /*上面这个方法会调用
113. _instance._addListener(listener);
114. 而_instance:private static POPServerUtil _instance = new POPServerUtil();
115. */
116. }
117. }
118. catch (Exception e) {
119. _log.error(e, e);
120. }
126. //============================权限验证方式二=========================================
128. PermissionLocalServiceImpl:
129. boolean hasUserPermission(long userId, String actionId, long resourceId)
131. resourceId是什么东西?
133. //=========================权限验证方式三===========================================
134. PortletPermissionUtil:
135. publicstaticboolean contains(PermissionChecker permissionChecker, long plid, String portletId,String actionId)
136. throws PortalException, SystemException{}
138. 怎么获取plid和portletId? (分别数据库表PORTLETPREFERENCES 的字段PLID和PORTLETID)====>>>>>>>
140. ThemeDisplay themeDisplay = (ThemeDisplay)request.getAttribute(WebKeys.THEME_DISPLAY);
142. long plId=themeDisplay.getPlid();
143. String portletId=themeDisplay.getPortletDisplay().getId();
147. 实战代码:
149. PermissionChecker permissionChecker=PermissionThreadLocal.getPermissionChecker();
150. ThemeDisplay themeDisplay = (ThemeDisplay)request.getAttribute(WebKeys.THEME_DISPLAY);
152. long plId=themeDisplay.getPlid();
153. String portletId=themeDisplay.getPortletDisplay().getId();
155. if( PortletPermissionUtil.contains(permissionChecker,plId,portletId,ActionKeys.CONFIGURATION)){
156. //做你想做的事
158. }