Filter
类 implement Filter
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
}
Filter顺序
注解按照命名顺序进行
xml 根据 mapping 顺序进行
注解写多个注解出发
urlPatterns={"/a","/b"}
HttpServletRequest request = (HttpServletRequest) ServletRequest;
//1.获取资源请求路径
String uri = request.getRequestURI();
创建和销毁
HttpSessionLister、ServletContextListener、ServletRequestListener
属性列表变化，分别为： HttpSessionAttributeLister、
ServletContextAttributeListener、ServletRequestAttributeListener
Session ，分别为：
HttpSessionBindingListener
( bound 和unbound事件)
和
HttpSessionActivationListener 钝化和激活的接口
