如何在Java中使用HttpURLConnection获取Cookies？

问题描述

当我使用 HttpURLConnection 并尝试 con.getHeaderField（ Set-Cookie）时，我得到以下响应：

When I use HttpURLConnection and try con.getHeaderField("Set-Cookie") I get this response:

__cfduid=1111111aaaaaa; expires=Wed, 19-Dec-18 06:19:46 GMT; path=/; domain=.site.com; HttpOnly

但是浏览器cookie是：

But the browser cookies are:

__cfduid=1111111aaaaaa; _ym_uid=000000000; PHPSESSID=zzzzzzzz; _ym_isad=1; key=555

如何使用 HttpURLConnection获取完整的Cookie ？对我来说，最重要的cookie是 key 。

How I can get the FULL cookie, using HttpURLConnection? The most important cookie for me is key.

推荐答案

Set-cookie 标头的值修改或附加新值浏览器中的Cookie。并且浏览器从cookie中删除过期的cookie。

The value of Set-cookie header modify or append new value to Cookies in browser. And browser delete expired cookie from cookies. The assembling work completed by browser.

当用Java请求Web时，程序员需要通过 Set-cookie 单个或多个响应中的标头。

When request web in java, programmer need assemble 'full' cookies by Set-cookie header in single or multi responses.

如果使用 HttpURLConnection ，则可以使用

If you use HttpURLConnection, you can use CookieManager

这是一个示例

CookieManager cookieManager = new CookieManager();
CookieHandler.setDefault(cookieManager);

URL url = new URL("https://stackoverflow.com");

URLConnection connection = url.openConnection();
connection.getContent();

List<HttpCookie> cookies = cookieManager.getCookieStore().getCookies();
for (HttpCookie cookie : cookies) {
    System.out.println(cookie.getDomain());
    System.out.println(cookie);
}

发送HTTP请求时， CookieManager 将自动填充Cookie标头。而且，该值可以直接从 CookieManger 按域实现。

When you send HTTP request, CookieManager will auto fill Cookie Header. And, the value can be directly achieved from CookieManger by domain.

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