最简单使用的配置登录拦截器(过滤器)的方法(SSH)

最简单使用的配置登录拦截器(过滤器)的方法,可集成于大部分框架中首先创建loginfilter类 继承httpservlet 实现Filter接口 注意是javax.servlet包下的filter

package com.fiss.controller;import java.io.IOException;import java.lang.reflect.Method;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.RequestDispatcher;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.springframework.aop.MethodBeforeAdvice;import com.fiss.entity.Admin;public class filter extends HttpServlet implements Filter {public void doFilter(ServletRequest req, ServletResponse resp,FilterChain chain) throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) req;HttpServletResponse response = (HttpServletResponse) resp;HttpSession session = request.getSession(true);String url = request.getRequestURI();Admin admin = (Admin) session.getAttribute("admin");if (admin == null && url.indexOf("login.jsp") == -1&& !url.equals("/fiss/") && !url.equals("/fiss/admin.do")) {String location = "/manager/login.jsp";request.getRequestDispatcher(location).forward(request, response);System.out.println("成功拦截到外星人企图入侵网站后台   :  " + url);response.setHeader("Cache-Control", "no-store");response.setDateHeader("Expires", 0);response.setHeader("Pragma", "no-cache");} else {chain.doFilter(request, response);}}public void init(FilterConfig arg0) throws ServletException {}}

写好以后在web.xml中配置拦截器

<filter><filter-name>loginFilter</filter-name>//这里的filterclass是你创建的fitler类<filter-class>com.fiss.controller.LoginFilter</filter-class></filter><filter-mapping><filter-name>loginFilter</filter-name>//定义规则<url-pattern>*.jsp</url-pattern></filter-mapping>

配置完成   启动服务器没有报错  尝试直接访问url页面  控制台成功输出拦截信息 OK