springsecurity框架的学习，根据操作修改后台ssm项目进行学习，实现页面显示登录的用户名（十）

		<span class="hidden-xs">
			<%--<security:authentication property="principal.username" />--%>
				<security:authentication property="name" />
					</span>

    @RequestMapping("/addRoleToUser")
    public String addRoleToUser(Integer[] ids, Integer userId){
        //从后台获取到当前认证通过后的用户名
        SecurityContextHolder.getContext().getAuthentication().getName();
        String username = ((SysUser) SecurityContextHolder.getContext().getAuthentication().getPrincipal()).getUsername();
        userService.addRoleToUser(userId, ids);
        return "redirect:toAddRolePage?success="+true+"&id="+userId;
    }