struts2 配置出现错误信息This is usually caused by using Struts tags without the associated filter

 The Struts dispatcher cannot be found.  This is usually caused by using Struts tags without the associated filter. Struts tags are only usable when the request has passed through its servlet filter, which initializes the Struts dispatcher needed for this tag. - [unknown location]
开始配置的时候只有配置了下面的让过滤器只能接受act而不能接受jsp

<filter-mapping>
  <filter-name>struts2</filter-name>
  <url-pattern>*.act</url-pattern>
  <dispatcher>REQUEST</dispatcher>
  <dispatcher>FORWARD</dispatcher>
 </filter-mapping>

补充完下面的就正常了

<filter-mapping>
  <filter-name>struts2</filter-name>
  <url-pattern>*.jsp</url-pattern>
  <dispatcher>REQUEST</dispatcher>
  <dispatcher>FORWARD</dispatcher>
 </filter-mapping>