运行环境:struts2环境中访问含有Struts标签的jsp页面。
抛出异常: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]。
原因:访问带有struts标签的jsp页面,必须通过Struts过滤器的过滤,才能正常显示,也就是要通过web.xml配置的过滤器访问。
web.xml:
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
以上在web.xml文件中配置的struts过滤器,只过滤后缀名为action的请求,后缀名为jsp页面请求,不在Struts过滤器处理范围,Struts标签自然也就无法解析,而抛出异常。
解决办法:把后缀名为jsp的URL请求,也加载到Struts过滤器处理范围内。
web.xml:
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
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