Session与Cookie

<!-- 登录拦截器,若没登录,访问任何*.jsp,*.action,*.servlet都跳转到登录界面 -->
<filter>
<filter-name>LoginFilter</filter-name>
<filter-class>*.LoginFilter</filter-class>
</filter>

<filter-mapping>
<filter-name>LoginFilter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>

public class LoginFilter extends HttpServlet implements Filter{
private static final long serialVersionUID = 1L;
private HttpSession session;

@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {

HttpServletRequest request = (HttpServletRequest)req;
HttpServletResponse response = (HttpServletResponse)res;
//拿到请求的path和uri
String path = request.getContextPath();
String uri =request.getRequestURI();
//拿到session,可以自行修改session时间
session = request.getSession();