Spring Boot + Spring Security: obtaining user information and session concurrency control - Part 19

First, access to the current user information

1.1 displays the user name currently logged in from the page

 <h1>欢迎使用Spring Security!
      当前登录账号：<label th:text="${name}"></label>
,通过标签设置： <label sec:authentication="name"></label>
</h1>

1.2 subject is obtained corresponding to the user currently logged in the program

	@GetMapping({"","/","/index"})
	public String index(Model model) {
		Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
		if("anonymousUser".equals(principal)) {
			model.addAttribute("name","anonymous");
		}else {
			User user = (User)principal;
			model.addAttribute("name",user.getUsername())