如何在Java Servlet中删除Cookie

Question

如何在Java servlet中删除cookie？我尝试了这个：http : //www.jguru.com/faq/view.jsp?EID=42225编辑：以下内容现在可以成功运行，它似乎是以下各项的组合：response.setContentType("text/html");和cookie.setMaxAge(0);在我做之前：//remove single signon cookie if it hasn't been validated yetresponse.setContentType("text/html");Cookie cookie = new Cookie(SSORealm.SSO_COOKIE_NAME, "");cookie.setDomain(SSORealm.SSO_DOMAIN);cookie.setMaxAge(-1);cookie.setPath("/");cookie.setComment("EXPIRING COOKIE at " + System.currentTimeMillis());response.addCookie(cookie);根据文档关闭浏览器时，cookie会过期。负值表示cookie不会持久存储，并且在Web浏览器退出时将被删除。零值将导致cookie被删除。使Cookie失效的完整工作片段为：//remove single signon cookie if it hasn't been validated yetresponse.setContentType("text/html");Cookie cookie = new Cookie(SSORealm.SSO_COOKIE_NAME, "");cookie.setDomain(SSORealm.SSO_DOMAIN);cookie.setMaxAge(0);cookie.setPath("/");cookie.setComment("EXPIRING COOKIE at " + System.currentTimeMillis());response.addCookie(cookie);

Answer 1

在我的环境中，以下代码有效。虽然乍看上去多余的，cookies[i].setValue("");并且cookies[i].setPath("/");是必要的，正确清除该cookie。

private void eraseCookie(HttpServletRequest req, HttpServletResponse resp) {

    Cookie[] cookies = req.getCookies();

    if (cookies != null)

        for (Cookie cookie : cookies) {

            cookie.setValue("");

            cookie.setPath("/");

            cookie.setMaxAge(0);

            resp.addCookie(cookie);

        }

}