如何解析cookie字符串 [英] How to parse a cookie string

问题描述

我想要一个 Cookie 字符串(因为它可能会在 Set-Cookie 标头中返回)并且能够轻松修改其中的一部分，特别是到期日期.

I would like to take a Cookie string (as it might be returned in a Set-Cookie header) and be able to easily modify parts of it, specifically the expiration date.

我看到有几个不同的 Cookie 类，例如 BasicClientCookie，但我没有看到任何简单的方法可以将字符串解析为这些对象之一.

I see there are several different Cookie classes, such as BasicClientCookie, available but I don't see any easy way to parse the string into one of those objects.

我在 api 级别 9 中看到他们添加了 HttpCookieparse 方法，但我需要一些东西在以前的版本中工作.

I see in api level 9 they added HttpCookie which has a parse method, but I need something to work in previous versions.

有什么想法吗?

谢谢

推荐答案

我相信您必须手动解析它.试试这个:

I believe you'll have to parse it out manually. Try this:

BasicClientCookie parseRawCookie(String rawCookie) throws Exception {
    String[] rawCookieParams = rawCookie.split(";");

    String[] rawCookieNameAndValue = rawCookieParams[0].split("=");
    if (rawCookieNameAndValue.length != 2) {
        throw new Exception("Invalid cookie: missing name and value.");
    }

    String cookieName = rawCookieNameAndValue[0].trim();
    String cookieValue = rawCookieNameAndValue[1].trim();
    BasicClientCookie cookie = new BasicClientCookie(cookieName, cookieValue);
    for (int i = 1; i < rawCookieParams.length; i++) {
        String rawCookieParamNameAndValue[] = rawCookieParams[i].trim().split("=");

        String paramName = rawCookieParamNameAndValue[0].trim();

        if (paramName.equalsIgnoreCase("secure")) {
            cookie.setSecure(true);
        } else {
            if (rawCookieParamNameAndValue.length != 2) {
                throw new Exception("Invalid cookie: attribute not a flag or missing value.");
            }

            String paramValue = rawCookieParamNameAndValue[1].trim();

            if (paramName.equalsIgnoreCase("expires")) {
                Date expiryDate = DateFormat.getDateTimeInstance(DateFormat.FULL)
                        .parse(paramValue);
                cookie.setExpiryDate(expiryDate);
            } else if (paramName.equalsIgnoreCase("max-age")) {
                long maxAge = Long.parseLong(paramValue);
                Date expiryDate = new Date(System.getCurrentTimeMillis() + maxAge);
                cookie.setExpiryDate(expiryDate);
            } else if (paramName.equalsIgnoreCase("domain")) {
                cookie.setDomain(paramValue);
            } else if (paramName.equalsIgnoreCase("path")) {
                cookie.setPath(paramValue);
            } else if (paramName.equalsIgnoreCase("comment")) {
                cookie.setPath(paramValue);
            } else {
                throw new Exception("Invalid cookie: invalid attribute name.");
            }
        }
    }

    return cookie;
}

我还没有真正编译或运行过这段代码，但这应该是一个很好的开始.您可能不得不对日期解析有些困惑:我不确定 cookie 中使用的日期格式实际上是否与 DateFormat.FULL 相同.(查看 this 相关问题，该问题解决了处理 cookie 中的日期格式.)另外，请注意有一些 cookie 属性不由 BasicClientCookie 处理，例如 version 和 httponly.

I haven't actually compiled or run this code, but it should be a strong start. You'll probably have to mess with the date parsing a bit: I'm not sure that the date format used in cookies is actually the same as DateFormat.FULL. (Check out this related question, which addresses handling the date format in cookies.) Also, note that there are some cookie attributes not handled by BasicClientCookie such as version and httponly.

最后，这段代码假设 cookie 的名称和值作为第一个属性出现:我不确定这是否一定是真的，但我见过的每个 cookie 都是这样排序的.

Finally, this code assumes that the name and value of the cookie appear as the first attribute: I'm not sure if that's necessarily true, but that's how every cookie I've ever seen is ordered.

这篇关于如何解析cookie字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！