Liferay异步刷新

    Liferay portlet异步刷新，分为两种情况。

    一、刷新自已
    1.在liferay-portlet.xml,文件中增加<render-weight>0</render-weight>
    2.增加下面代码：此代码可以获得一个portlet的refreshURL

 

 

	public static String getPortletRefreshURL(ThemeDisplay themeDisplay,
			HttpServletRequest request, String portletId, long plid){

		StringBuilder url = new StringBuilder();
		
		try {
			String doAsUserId = themeDisplay.getDoAsUserId();
			
			LayoutTypePortlet layoutTypePortlet = themeDisplay.getLayoutTypePortlet();
			
			UnicodeProperties properties = 
				layoutTypePortlet.getLayout().getTypeSettingsProperties();
			
			String columnId = "";
			int columnPos = 0;
			Portlet portlet = null;
			int columnCount = 0;
			
			for(String key : properties.keySet()){
				if(properties.get(key).indexOf(portletId) != -1)
					columnId = key;
			}
			
			List<Portlet> portlets = layoutTypePortlet.getAllPortlets(columnId);
			
			for(Portlet portlet1 : portlets){
                                //修改此处可以支持<instanceable>true</instanceable>的portlet
				if(portlet1.getPortletId().equals(portletId)){
					portlet = portlet1;
					break;
				}else
					columnPos++;
			}
			columnCount = portlets.size();

			url.append(themeDisplay.getPathMain());
			url.append("/portal/render_portlet");
			url.append("?p_l_id=");
			url.append(plid);
			url.append("&p_p_id=");
			url.append(portletId);
			url.append("&p_p_lifecycle=0&p_p_state=normal&p_p_mode=view&p_p_col_id=");
			url.append(columnId);
			url.append("&p_p_col_pos=");
			url.append(columnPos);
			url.append("&p_p_col_count=");
			url.append(columnCount);
			//PortletLocalServiceUtil.getPortletById(companyId, portletId)

			if (portlet.isStatic()) {
				url.append("&p_p_static=1");

				if (portlet.isStaticStart()) {
					url.append("&p_p_static_start=1");
				}
			}

			if (Validator.isNotNull(doAsUserId)) {
				url.append("&doAsUserId=");
				url.append(doAsUserId);
			}

			url.append("&currentURL=");
			url.append(HttpUtil.encodeURL(PortalUtil.getCurrentURL(request)));

			String ppid = ParamUtil.getString(request, "p_p_id");

			if (ppid.equals(portletId)) {
				Enumeration enu = request.getParameterNames();

				while (enu.hasMoreElements()) {
					String name = (String)enu.nextElement();

					if (!PortalUtil.isReservedParameter(name)) {
						String[] values = request.getParameterValues(name);

						for (int i = 0; i < values.length; i++) {
							url.append(StringPool.AMPERSAND);
							url.append(name);
							url.append(StringPool.EQUAL);
							url.append(HttpUtil.encodeURL(values[i]));
						}
					}
				}

				Map renderParameters = RenderParametersPool.get(request, plid, ppid);

				Iterator itr = renderParameters.keySet().iterator();

				while (itr.hasNext()) {
					String name = (String)itr.next();

					String[] values = (String[])renderParameters.get(name);

					for (int i = 0; i < values.length; i++) {
						url.append(StringPool.AMPERSAND);
						url.append(name);
						url.append(StringPool.EQUAL);
						url.append(HttpUtil.encodeURL(values[i]));
					}
				}
			}
		} catch (SystemException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return url.toString();
	}

    3.在jsp中，增加下面javascript

  <script type="text/javascript">
    function <portalet:namespace/>refresh()
    {
        var ns = '<%= PortalUtil.getPortletNamespace(PortalUtil.getPortletId(request)) %>';
        var url = '<%=PortletKernelUtil.getPortletRefreshURL(themeDisplay,request,PortalUtil.getPortletId(request),plid)%& gt;'；
        var portlet = jQuery('#p_p_id'+ns)[0];
        portlet.refreshURL = url;
        portlet.id = '<%=PortalUtil.getPortletId(request)%>';
        Liferay.Portlet.refresh(portlet);
    }
    </script>

 

    4.在需要刷新的地方调用javascript <portalet:namespace/>refresh即可

    二、A调用B
    第1、2、4步同上面，唯一区别的是第3步
    getPortletRefreshURL第三个参数需要传入B的portletId,
    <portalet:namespace/>refresh中ns的值要改成B的namespace即可。

以下备注一定要读：
       注：这里所提出的A调用B方案仅支持<instanceable>false</instanceable>的portlet,因为instanceable=false,portletId就是固定的值，这样namespace就可以确定（namespace="_"+portletId+"_"）,而instanceable=true的portletId是会在后面加上自动生的四位识别码，这个是随机的无法确定。如果你一定想支持instanceable=true的portlet，你需要进行扩展，在代码里有注释的地方，进行扩展，反回一个Map<portletId, portletRefreshURL>,然后通过map循环调用js代码即可。