How does struts2.3 configure web. XML using sitemesh?

When sitemesh is used in struts, the following error occurs: "The struts dispatcher not found". I do not know how to configure it. Later, I found that the following configuration should be changed from struts2.1.3 before integration, otherwise, the struts2 tag cannot be used on the decorator page or the decored page.

   <  Filter  >         <  Filter-name  > Strutspreparefilter </  Filter-name  >         <  Filter-class  > Org. Apache. struts2.dispatcher. Ng. Filter. strutspreparefilter</  Filter-class  >      </  Filter  >      <  Filter  >         <  Filter-name  > Sitemesh </  Filter-name  >         <  Filter-class > Com. opensymphony. Module. sitemesh. Filter. pagefilter </  Filter-class  >      </  Filter  >      <  Filter  >         <  Filter-name  > Strutsexecutefilter </  Filter-name >         <  Filter-class  > Org. Apache. struts2.dispatcher. Ng. Filter. strutsexecutefilter </  Filter-class  >      </  Filter  >      <  Filter-Mapping  >         <  Filter-name  > Strutspreparefilter </  Filter-name  >         <  URL-Pattern  > /* </  URL-Pattern  >      </  Filter-Mapping  >      <  Filter-Mapping  >         < Filter-name  > Sitemesh </  Filter-name  >         <  URL-Pattern  > /* </  URL-Pattern  >      </  Filter-Mapping  >      <  Filter-Mapping >         <  Filter-name  > Strutsexecutefilter </  Filter-name  >         <  URL-Pattern  > /* </  URL-Pattern  >      </  Filter-Mapping  > 

 

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