package lab.s2jh.core.web.sitemesh;import org.sitemesh.DecoratorSelector;import org.sitemesh.builder.SiteMeshFilterBuilder;import org.sitemesh.config.ConfigurableSiteMeshFilter;import org.sitemesh.webapp.WebAppContext;/** * 擴展實現注入基于request參數decorator值進行動態定位裝飾器的選擇器 */public class ParamConfigurableSiteMeshFilter extends ConfigurableSiteMeshFilter { protected void applyCustomConfiguration(SiteMeshFilterBuilder builder) { //獲取原有默認配置裝飾選擇器 DecoratorSelector defaultDecoratorSelector = builder.getDecoratorSelector(); //賦給自定義裝飾選擇器，則自定義規則未匹配時調用默認選擇器獲取 builder.setCustomDecoratorSelector(new ParamDecoratorSelector(defaultDecoratorSelector)); }}

package lab.s2jh.core.web.sitemesh;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import org.apache.commons.lang3.StringUtils;import org.sitemesh.DecoratorSelector;import org.sitemesh.content.Content;import org.sitemesh.webapp.WebAppContext;/** * 基于request參數decorator值進行動態定位裝飾器的選擇器 * 如果decorator參數有值，則返回"/WEB-INF/views/layouts/" + decorator + ".jsp"作為目標裝飾模板頁面 */public class ParamDecoratorSelector implements DecoratorSelector { private DecoratorSelector defaultDecoratorSelector; public ParamDecoratorSelector(DecoratorSelector defaultDecoratorSelector) { this.defaultDecoratorSelector = defaultDecoratorSelector; } public String[] selectDecoratorPaths(Content content, WebAppContext context) throws IOException { // build decorator based on the request HttpServletRequest request = context.getRequest(); String decorator = request.getParameter("decorator"); if (StringUtils.isNotBlank(decorator)) { //按照參數值返回對應路徑下面的jsp裝飾模板頁碼 return new String[] { "/WEB-INF/views/layouts/" + decorator + ".jsp" }; } // Otherwise, fallback to the standard configuration return defaultDecoratorSelector.selectDecoratorPaths(content, context); }}

  sitemeshFilter lab.s2jh.core.web.sitemesh.ParamConfigurableSiteMeshFilter   sitemeshFilter /*