<filter>
        <filter-name>struts2</filter-name>
        <filter-class>
            org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
        </filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

 <servlet> 
        <servlet-name>ConnectorServlet</servlet-name> 
        <servlet-class>com.ckfinder.connector.ConnectorServlet</servlet-class>
        <init-param> 
            <param-name>XMLConfig</param-name> 
            <param-value>/WEB-INF/ckfinder.xml</param-value> 
        </init-param> 
        <init-param> 
            <param-name>debug</param-name> 
            <param-value>false</param-value> 
        </init-param> 
        <load-on-startup>1</load-on-startup> 
    </servlet> 
    <servlet-mapping>
        <servlet-name>ConnectorServlet</servlet-name> 
        <url-pattern>/ckfinder2.4/core/connector/java/connector.java </url-pattern> 
    </servlet-mapping>

解决办法：

import org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter;

public class MyStrutsInterceptor extends StrutsPrepareAndExecuteFilter {
    public void doFilter(ServletRequest req, ServletResponse res,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        String URI = request.getRequestURI();
    
        String[] ckfarr = URI.split("/ckfinder2.4/core/connector/java/*/");
        int arrayLen = ckfarr.length;
        if (arrayLen >= 2) {
            chain.doFilter(req, res);
        } else {
            super.doFilter(req, res, chain);
        }

    }

}