扩展Sitemesh3DecoratorSelector实现基于请求参数调用装饰模板页面的实现_ht

扩展入口Filter实现：

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;/** * 扩展实现注入基于request参数decorator值进行动态定位装饰器的选择器 */public class ParamConfigurableSiteMeshFilter extends ConfigurableSiteMeshFilter {    protected void applyCustomConfiguration(SiteMeshFilterBuilder builder) {        //获取原有默认配置装饰选择器        DecoratorSelector  defaultDecoratorSelector = builder.getDecoratorSelector();        //赋给自定义装饰选择器，则自定义规则未匹配时调用默认选择器获取        builder.setCustomDecoratorSelector(new ParamDecoratorSelector(defaultDecoratorSelector));    }} 

定制装饰选择器实现：

package lab.s2jh.core.web.sitemesh;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import org.apache测试数据mons.lang3.StringUtils;import org.sitemesh.DecoratorSelector;import org.sitemesh.content.Content;import org.sitemesh.webapp.WebAppContext;/** * 基于request参数decorator值进行动态定位装饰器的选择器 * 如果decorator参数有值，则返回"/WEB-INF/views/layouts/" + decorator + ".jsp"作为目标装饰模板页面 */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)) {            //按照参数值返回对应路径下面的jsp装饰模板页码            return new String[] { "/WEB-INF/views/layouts/" + decorator + ".jsp" };        }        // Otherwise, fallback to the standard configuration        return defaultDecoratorSelector.selectDecoratorPaths(content, context);    }} 

调整web.xml配置：

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

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