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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