Filter

創(chuàng)建——implements javax.servlet.Filter

@WebFilter(filterName="名"，urlPatterns={"路徑1","路徑2","路徑3","路徑4"..........})

實現(xiàn)接口三個方法——init();doFilter();destory();

doFilter(ServletRequest req,ServletResponse resp,FilterChain chain);

獲取URI——HttpServletRequest request=(HttpServletRequest)req? ? ? String uri=request.getRequestURI();

多個filter執(zhí)行順序——xml文件內(nèi)有則按照xml順序執(zhí)行，否則按照字母表順序執(zhí)行

Listener

創(chuàng)建——implements ServletContextListener,HttpSessionListener,HttpSessionAttributeListener

監(jiān)聽三個對象——ServletContext,HttpSession,ServletRequest

值的改變——implements HttpSessionBindingListener