在线踢人BUG

确定要踢出该用户
sessionRegistry.getAllSessions(userDetails, false));
中 list<SessionInformation > size 数量为零

for (SessionInformation sessionInformation : sessionRegistry.getAllSessions(userDetails, false)){}
 中 sessionRegistry.getAllSessions(userDetails, false); 返回list<SessionInformation> 但是数量为0
 sessionRegistry.getAllSessions 的由子类 SessionRegistryImpl实现的方法如下
  public List<SessionInformation> getAllSessions(Object principal, boolean includeExpiredSessions) {
        Set<String> sessionsUsedByPrincipal = (Set)this.principals.get(principal);//返回NULL
        if (sessionsUsedByPrincipal == null) {
            return Collections.emptyList();
        } else {...}
中 (Set)this.principals.get(principal) 返回 Set<String> sessionsUsedByPrincipal 等于 null

暂时解决办法
 * Describe: 用户领域模型  SysUser 类 重写 hashCode() ,equals()方法  // @Override public int hashCode() {return this.username.hashCode();}
SessionListener 类 添加spring 管理 @Component注解
@WebListener
public class SessionListener implements HttpSessionListener {}

HttpSessionContext  map 删除key value
HttpSession  invalidate方法删除

--------------------------------------------------
类

```
public class SysOnlineController

/**
     * Describe: 踢出用户（下线）
     * Param: onlineId
     * Return: ModelAndView
     */
    @ResponseBody
    @DeleteMapping("/remove/{onlineId}")
    public Result remove(@PathVariable String onlineId) {
        // 从sessionRegistry中获取所有的用户信息
        List<Object> principals = sessionRegistry.getAllPrincipals();
        for (Object principal : principals) {
            SysUser userDetails = (SysUser) principal;
            String userId = userDetails.getUserId();
            if (onlineId.equals(userId)) {
                // 不允许操作admin用户下线
                if ("admin".equals(userDetails.getUsername())) {
                    return failure("不允许操作超级管理员[admin]下线");
                }
                for (SessionInformation sessionInformation : sessionRegistry.getAllSessions(userDetails, false)) {
// -- foreach 未能进入 size 为零 , SysUser  hashcode()方法需要重写 
//   @Override public int hashCode() {return this.username.hashCode();} 
//
                    sessionInformation.expireNow();
                    // 从sessionRegistry中清除session信息
                    sessionRegistry.removeSessionInformation(sessionInformation.getSessionId());
                    HttpSessionContext sessionContext = HttpSessionContextHolder.currentSessionContext();
                    // 销毁session
                    sessionContext.getSession(sessionInformation.getSessionId()).invalidate();
                }
                return success(String.format("用户[%s]已下线", userDetails.getRealName()));
            }
        }

return failure();
    }
```

lunar landing/Pear Admin Boot

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