设置 cookie 并返回给客户端

@GetMapping("/change-username")
public String setCookie(HttpServletResponse response) {
    // 创建一个 cookie
    Cookie cookie = new Cookie("username", "Jovan");
    //设置 cookie过期时间
    cookie.setMaxAge(7 * 24 * 60 * 60); // expires in 7 days
    //添加到 response 中
    response.addCookie(cookie);
    return "Username is changed!";
}

使用 Spring 框架提供的 @CookieValue注解获取特定的 cookie 的值

@GetMapping("/")
public String readCookie(@CookieValue(value = "username", defaultValue = "Atta") String username) {
    return "Hey! My username is " + username;
}

读取所有的 cookie 值

@GetMapping("/all-cookies")
public String readAllCookies(HttpServletRequest request) {
    Cookie[] cookies = request.getCookies();
    if (cookies != null) {
        return Arrays.stream(cookies).map(c -> c.getName() + "=" + c.getValue()).collect(Collectors.joining(", "));
    }
    return "No cookies";
}