js程式碼：

	$(".logout").click(function() {
			if (confirm('系統提示，您確定要退出本次登入嗎?')) {
				location.href = ctx + '/logout';
			}
		});

<a href="#" class="logout">安全退出</a>

@RequestMapping(value = "/logout")
	public String logout(HttpSession httpSession) {
		Student student = (Student) httpSession.getAttribute("currentUser");
		if(null != student) {
			httpSession.removeAttribute("currentUser");
		}
		return "redirect:/index";
	}