一、 自己写一个filter类
package com.ujy.filter; import javax.servlet.*; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; public class LoginFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest servletRequest = (HttpServletRequest)request; HttpServletResponse servletResponse = (HttpServletResponse)response; String requestURI = servletRequest.getRequestURI(); //当前登录的用户 不拦截 Object loginUser = servletRequest.getSession().getAttribute("loginUser"); if (loginUser != null || requestURI.contains("static") ||requestURI.contains("code") || requestURI.contains("login") ||requestURI.endsWith("gif")) { //包含以上条件 ,方形 chain.doFilter(request,response); }else { servletResponse.sendRedirect(servletRequest.getContextPath()+"/login.jsp"); } } @Override public void destroy() { } }
二、在web.xml里面配置
<!-- 登录权限验证--> <!-- <filter>--> <!-- <filter-name>LoginFilter</filter-name>--> <!-- <filter-class>com.ujy.filter.LoginFilter</filter-class>--> <!-- </filter>--> <!-- <filter-mapping>--> <!-- <filter-name>LoginFilter</filter-name>--> <!-- <url-pattern>/*</url-pattern>--> <!-- </filter-mapping>-->