[java]获取重定向url地址

    /**
     * 获取重定向地址
     */
    public static String getRedirectUrl(String url) throws IOException {
        HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
        conn.setInstanceFollowRedirects(false);
        conn.setConnectTimeout(5000);
        return conn.getHeaderField("Location");
    }