Extension SITEMESH3 Decoratorselector implementation based on request parameter invocation of decorative template page

• Extended Ingress Filter Implementation:
  

package lab.s2jh.core.web.sitemesh;import org.sitemesh.decoratorselector;import  Org.sitemesh.builder.sitemeshfilterbuilder;import org.sitemesh.config.configurablesitemeshfilter;import The  org.sitemesh.webapp.WebAppContext;/** *  extension implements a selector that injects a dynamically positioned adorner based on the decorator value of the request parameter  */public  class ParamConfigurableSiteMeshFilter extends ConfigurableSiteMeshFilter {     protected void applycustomconfiguration (Sitemeshfilterbuilder builder)  {         //get the original default configuration decorator selector          DecoratorSelector<WebAppContext> defaultDecoratorSelector =  Builder.getdecoratorselector ();         //assigns a custom decoration selector, If the custom rule does not match, call the default selector to get         builder.setcustomdecoratorselector (new  paramdecoratorselector (Defaultdecoratorselector));     }} 

• Custom adornment selector implementation:
  

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;/** *  selector for dynamically positioned adorners based on decorator value of request parameter  *  If the decorator parameter has a value, it returns "/web-inf/views/layouts/"  + decorator +  ". JSP" as the target Adornment template page  */public  class paramdecoratorselector implements decoratorselector<webappcontext> {     private DecoratorSelector<WebAppContext> defaultDecoratorSelector;     public paramdecoratorselector (decoratorselector<webappcontext>  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))  {             //returns the JSP decoration template number below the corresponding path according to the parameter value             return  new String[] {  "/web-inf/views/layouts/"  + decorator +  ". JSP"  };         }        //  Otherwise, fallback to the standard configuration        return  Defaultdecoratorselector.selectdecoratorpaths (content, context);     }}

• To adjust the Web. XML configuration:

<filter> <filter-name>sitemeshFilter</filter-name> <FILTER-CLASS>LAB.S2JH.CORE.WEB.S Itemesh. paramconfigurablesitemeshfilter</filter-class> </filter> <filter-mapping> <FILTER-NAME&G T;sitemeshfilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

Extension SITEMESH3 Decoratorselector implementation based on request parameter invocation of decorative template page