首先,我先说步骤:
1.登陆
2.查看该用户是否已经登陆 是:3 否:正常登陆
3.将已登陆用户踢出,自己登陆。
这只是说原理,具体实现现在说。
踢出已登陆用户,主要体现在对已登陆用户session的处理上,原理简单,就是将已登陆用户的session删除就好。
难点在于如何找到该用户的session。
这里,我使用了redis
首先,在登陆的时候获取用户的sessionId,也就是浏览器中的jessionId,因为我使用的是shiro框架,方法如下:
Subject user = SecurityUtils.getSubject();
UsernamePasswordToken token = new UsernamePasswordToken(phone, MD5Utils.getMD5Str(password).toCharArray()); //DigestUtils.md5Hex(password).toCharArray());//
token.setRememberMe(true);
try {
user.login(token);
user.getSession().setTimeout(-1000L); // 开发时设置永不过期,上线时需要调整 todo
} catch (UnknownAccountException e) {
logger.error("账号不存在:{}", e);
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_ACCOUNT_OR_PASSWORD_ERROR);
} catch (DisabledAccountException e) {
logger.error("账号未启用:{}", e);
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_NOT_ENABLED);
} catch (IncorrectCredentialsException e) {
logger.error("密码错误:{}", e);
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_ACCOUNT_OR_PASSWORD_ERROR);
} catch (RuntimeException e) {
logger.error("未知错误,请联系管理员:{}" + e.toString(), e);
System.out.println(e.toString());
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_OTHER_REASON);
}
SessionsSecurityManager securityManager = (SessionsSecurityManager) SecurityUtils.getSecurityManager();
DefaultSessionManager sessionManager = (DefaultSessionManager) securityManager.getSessionManager();
String sessionId = String.valueOf(user.getSession().getId());
主要是其中这段
SessionsSecurityManager securityManager = (SessionsSecurityManager) SecurityUtils.getSecurityManager();
DefaultSessionManager sessionManager = (DefaultSessionManager) securityManager.getSessionManager();
String sessionId = String.valueOf(user.getSession().getId());
拿到当前登陆用户的sessionId之后,就该获取存入redis中的在这之前登陆的用户的sessionId,
这里我要解释一下sessionId的存取的现实操作步骤:
(背景:A用户没有登陆。)
1.A用户登陆,并获取A用户的sessionId
Subject user = SecurityUtils.getSubject();
UsernamePasswordToken token = new UsernamePasswordToken(phone, MD5Utils.getMD5Str(password).toCharArray()); //DigestUtils.md5Hex(password).toCharArray());//
// token.setRememberMe(true);
try {
user.login(token);
user.getSession().setTimeout(7*24*3600*1000); // 开发时设置永不过期,上线时需要调整 todo
} catch (UnknownAccountException e) {
logger.error("账号不存在:{}", e);
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_ACCOUNT_OR_PASSWORD_ERROR);
} catch (DisabledAccountException e) {
logger.error("账号未启用:{}", e);
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_NOT_ENABLED);
} catch (IncorrectCredentialsException e) {
logger.error("密码错误:{}", e);
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_ACCOUNT_OR_PASSWORD_ERROR);
} catch (RuntimeException e) {
logger.error("未知错误,请联系管理员:{}" + e.toString(), e);
System.out.println(e.toString());
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_OTHER_REASON);
}
SessionsSecurityManager securityManager = (SessionsSecurityManager) SecurityUtils.getSecurityManager();
DefaultSessionManager sessionManager = (DefaultSessionManager) securityManager.getSessionManager();
String sessionId = String.valueOf(user.getSession().getId());//这个就是A的sessionId
2.从redis根据条件获取sessionId,当然,因为之前并没有存入,所以获取不到,这里的条件是phone+“redist“,保证唯一
String sessionId2 = jedisConfiguration.getJedisClient().get(phone+"redis");
3.判断sessionId2是否为空,如果为空的话,就走第4步,否则,就先根据sessionId2获取sessionKey,再根据sessionKey获取session,然后根据sessionManager删除指定session,也就是我们希望踢掉的用户的session
if(StringUtil.isNotEmpty(sessionId2)) {
SessionKey sessionKey = new WebSessionKey(jedisConfiguration.getJedisClient().get(phone+"redis"),request,response);
try {
Session session = securityManager.getSession(sessionKey);
if(!sessionId.equals(sessionId2))
sessionManager.getSessionDAO().delete(session);
}catch (Exception e){
e.printStackTrace();
}
jedisConfiguration.getJedisClient().del(phone+"redis");
}
4.这步也就结束了,将新用户的sessionId存入redis,方便被下一个用户踢
jedisConfiguration.getJedisClient().set(phone + "redis", sessionId);
public ChariotResponseEntity login(String phone, String password,HttpServletRequest request,HttpServletResponse response) throws Exception {
logger.info("POST请求登录");
if (StringUtils.isBlank(phone) || StringUtils.isBlank(password)) {
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_PARAMETER_ERROR);
}
Subject user = SecurityUtils.getSubject();
UsernamePasswordToken token = new UsernamePasswordToken(phone, MD5Utils.getMD5Str(password).toCharArray()); //DigestUtils.md5Hex(password).toCharArray());//
token.setRememberMe(true);
try {
user.login(token);
user.getSession().setTimeout(-1000L); // 开发时设置永不过期,上线时需要调整 todo
} catch (UnknownAccountException e) {
logger.error("账号不存在:{}", e);
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_ACCOUNT_OR_PASSWORD_ERROR);
} catch (DisabledAccountException e) {
logger.error("账号未启用:{}", e);
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_NOT_ENABLED);
} catch (IncorrectCredentialsException e) {
logger.error("密码错误:{}", e);
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_ACCOUNT_OR_PASSWORD_ERROR);
} catch (RuntimeException e) {
logger.error("未知错误,请联系管理员:{}" + e.toString(), e);
System.out.println(e.toString());
return new ChariotResponseEntity<>(ChariotHttpStatus.USER_OTHER_REASON);
}
SessionsSecurityManager securityManager = (SessionsSecurityManager) SecurityUtils.getSecurityManager();
DefaultSessionManager sessionManager = (DefaultSessionManager) securityManager.getSessionManager();
String sessionId = String.valueOf(user.getSession().getId());
String sessionId2 = jedisConfiguration.getJedisClient().get(phone+"redis");
if(StringUtil.isNotEmpty(sessionId2)) {
SessionKey sessionKey = new WebSessionKey(jedisConfiguration.getJedisClient().get(phone+"redis"),request,response);
try {
Session session = securityManager.getSession(sessionKey);
if(!sessionId.equals(sessionId2))
sessionManager.getSessionDAO().delete(session);
}catch (Exception e){
e.printStackTrace();
}
Long result = jedisConfiguration.getJedisClient().del(phone+"redis");
}
String result1 = jedisConfiguration.getJedisClient().set(phone + "redis", sessionId);
UserVO retUser = userService.getUserById(getCurrentUserId());
return new ChariotResponseEntity<>(retUser, ChariotHttpStatus.OK);
}
如果以上代码看着头痛,可以看我截取的部分
SessionsSecurityManager securityManager = (SessionsSecurityManager) SecurityUtils.getSecurityManager();
DefaultSessionManager sessionManager = (DefaultSessionManager) securityManager.getSessionManager();
String sessionId = String.valueOf(user.getSession().getId());
String sessionId2 = jedisConfiguration.getJedisClient().get(phone+"redis");
if(StringUtil.isNotEmpty(sessionId2)) {
SessionKey sessionKey = new WebSessionKey(jedisConfiguration.getJedisClient().get(phone+"redis"),request,response);
try {
Session session = securityManager.getSession(sessionKey);
if(!sessionId.equals(sessionId2))
sessionManager.getSessionDAO().delete(session);
}catch (Exception e){
e.printStackTrace();
}
Long result = jedisConfiguration.getJedisClient().del(phone+"redis");
}
String result1 = jedisConfiguration.getJedisClient().set(phone + "redis", sessionId);
个人感觉,我这样写的好处是准确的取到session,不用遍历,因为我在网上只看到过遍历出来取到的session,因为是自己的想法,所以,我认为自己是原创了,毕竟我也没找到其他人这么做的。