web系统在线用户管理实现

1、创建一个sessionBean类，用来封装session里面自己需要的参数，将其封装成对象；

package com.lh.bean;import java.io.Serializable;import java.util.Calendar;import javax.servlet.http.HttpSession;import com.mbpsoft.shop.common.BussinessUtil;import com.mbpsoft.shop.entity.Admin;public class SessionBean implements Serializable {private static final long serialVersionUID = -7519486823153844426L;private String sessionid; // 会话编号private String creationTime;// 创建时间private Admin admin;//登录人private HttpSession session;private Calendar cal = Calendar.getInstance();public SessionBean(HttpSession session,Admin admin ){this.sessionid = session.getId();cal.setTimeInMillis(session.getCreationTime());this.creationTime = BussinessUtil.time2String(cal.getTime());this.session = session;this.admin = admin;}public String getSessionid() {return sessionid;}public void setSessionid(String sessionid) {this.sessionid = sessionid;}public String getCreationTime() {return creationTime;}public void setCreationTime(String creationTime) {this.creationTime = creationTime;}//最后运行时间public String getLastAccessedTime() {cal.setTimeInMillis(this.session.getLastAccessedTime());return  BussinessUtil.time2String(cal.getTime());}//可以得到用户实时的在线时长@SuppressWarnings("finally")public String getAccessedTime() {String time = "";try {time = (Calendar.getInstance().getTimeInMillis()-this.session.getCreationTime())/1000/60+"";} catch (Exception e) {//BussinessUtil.sessionBeans.remove(this.admin.getId());//BussinessUtil.sessions.remove(this.admin.getId());this.session = null;time = "∞";} finally {return time; }}<pre name="code" class="java"><span style="white-space:pre"></span>@SuppressWarnings("finally")public String getWaitingTime() {String time = "";try {time = (Calendar.getInstance().getTimeInMillis()-this.session.getLastAccessedTime())/1000/60+"";} catch (Exception e) {//BussinessUtil.sessionBeans.remove(this.admin.getId());//BussinessUtil.sessions.remove(this.admin.getId());this.session = null;time = "∞";} finally {return time; }}public HttpSession getSession() {return session;}public void setSession(HttpSession session) {this.session = session;}@SuppressWarnings("finally")public int getIsValitate(){long time = 0l;int flag = 0;try {if(this.session == null){flag = 2;}else{time = (Calendar.getInstance().getTimeInMillis()-this.session.getLastAccessedTime())/1000/60;if(time>20)flag = 1;elseflag = 0;}} catch (Exception e) {flag = 2;} finally {return flag;}}}

2、定义一个全局静态变量sessionBeans(key为当前用户编号，value为用户登录系统建立的会话)，在用户登录成功进行权限加载时，将该用户会话存入sessionBeans；

public static Map<String,SessionBean> sessionBeans = new HashMap<String, SessionBean>();

3、将sessionBeans放入session里，方便在前台页面进行用户管理；

getServletContext().setAttribute("sessionBeans", sessionBeans);

4、通过spring来进行定时执行任务，进行会话管理

package com.lh.quartz;import java.util.Iterator;import java.util.Map;import javax.annotation.Resource;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import com.mbpsoft.shop.bean.SessionBean;import com.mbpsoft.shop.common.BussinessUtil;import com.mbpsoft.shop.service.AdminService;public class QuartzJob {@Resource(name="synchronizeDataServiceImpl")private SynchronizeDataService synchronizeDataService;@Resource(name = "adminServiceImpl")private AdminService adminService;public Log log = LogFactory.getLog(this.getClass());public void checkSession() {Map<String,SessionBean> map = BussinessUtil.sessionBeans;Iterator<String> keyIterator = map.keySet().iterator();try {while(keyIterator.hasNext()){String key = keyIterator.next();SessionBean sessionBean = map.get(key);int flag = sessionBean.getIsValitate();if(flag>0){adminService.deleteRightOnTime(sessionBean.getSessionid());BussinessUtil.sessionBeans.remove(key);BussinessUtil.sessions.remove(key);if(flag>1){log.info("注销用户："+key+"异常用户");}else{log.info("注销用户："+key+"超时用户");sessionBean.getSession().invalidate();}}}} catch (Exception e) {log.info("用户已异常注销");checkSession();}}}

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"><bean id="quartzJob" class=" com.mbpsoft.shop.quartz.QuartzJob"/><bean id="checkSession" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean"><property name="targetObject" ref="quartzJob"></property><property name="targetMethod" value="checkSession"></property><property name="concurrent" value="false"/></bean><bean id="cronTriggerSession" lazy-init="false"  class="org.springframework.scheduling.quartz.CronTriggerBean"><!--每20分钟执行一次--><property name="jobDetail" ref="checkSession"></property><property name="cronExpression" value="0 0/20 * * * ? "></property></bean><!-- 设置调度   --><bean id="scheduler" class="org.springframework.scheduling.quartz.SchedulerFactoryBean" ><property name="triggers"><list><ref bean="cronTriggerSession"/></list></property><property name="autoStartup" value="true"/> </bean></beans>

5、最终展示页面如下，方便随时管理在线用户