@注解与普通web.xml的关系

@WebServlet(name = "SimpleServlet" ,urlPatterns = {"/simple"})   
public class SimpleServlet extends HttpServlet{ … }   
@WebFilter(filterName="CommonFliter",urlPatterns="")
<servlet>   
    <servlet-name>SimpleServlet</servlet-name>  
    <servlet-class>footmark.servlet.SimpleServlet</servlet-class>    
</servlet>  
<servlet-mapping>  
    <servlet-name>SimpleServlet</servlet-name>  
    <url-pattern>/simple</url-pattern>  
</servlet-mapping>