springboot之cookie操作

1.cookie相关知识

https://developer.mozilla.org/en-US/docs/Web/HTTP/Cookies

https://javascript.ruanyifeng.com/bom/cookie.html#toc5

2.cookie相关操作

2.1.获取

通过HttpServletRequest查询

    private String getCookie(HttpServletRequest request,String name){
        Cookie[] cookies =  request.getCookies();
        if(cookies != null){
            for(Cookie cookie : cookies){
                if(cookie.getName().equals(name)){
                    return cookie.getValue();
                }
            }
        }
        return null;
    }

通过@CookieValue查询

    @RequestMapping("/a/a")
    String home1(@CookieValue(name = "token", required = false) String token) {
        System.err.println(token);
        return "";
    }

2.2.新增

Cookie c = new Cookie("token", "b");
response.addCookie(c);

2.3.修改

如果服务器想改变一个早先设置的 Cookie，必须同时满足四个条件：Cookie 的key、domain、path和secure都匹配。

Cookie c = new Cookie("token", "a"+1);
response.addCookie(c);

2.4.删除

将cookie的Max-Age设置为0

Cookie c = new Cookie("token", "a"+1);
c.setMaxAge(0);
response.addCookie(c);