Session过期后实现自动跳转登录页面
最近研究如果用原生的Filter来判别session存在否或者过期否。来跳转到的页面实例,下载来展示代码。
因为顾虑器是每次请求能会进入的,所以可以设置了,进行拦截判断
1.配置web.xml
<filter> <filter-name>BackEndFilter</filter-name> <filter-class>com.sun.BackFilter</filter-class> </filter> <filter-mapping> <filter-name>BackFilter</filter-name> <url-pattern>/backend/issues/*</url-pattern> <url-pattern>/backend/repairmen/*</url-pattern> <url-pattern>/backend/payment/*</url-pattern> </filter-mapping>
2.新建BackFilter类,实现Filter接口。
package com.xyt.backend; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import com.xyt.common.Logging; import com.xyt.common.RedisClient; import com.xyt.jdbc.entity.Admin; /** * 后台管理系统登录拦截器 */ public class BackFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { //useless } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpSession sess = ((HttpServletRequest)request).getSession(); String ad = sess.getAttribute("admin"); if(ad==null ){ ((HttpServletResponse)response).sendRedirect(((HttpServletRequest)request).getContextPath()+"//login"); }else{ chain.doFilter(request, response); } } @Override public void destroy() { //useless } }
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