public void logout() throws HttpException, IOException {
        GetMethod get = new GetMethod(LOGOUT_URL);
        get.setRequestHeader(USER_AGENT_H, USER_AGENT);
        get.setRequestHeader("Cookie", this.cookiestr);
        int status = client.executeMethod(get);
        if (status == HttpStatus.SC_OK) {
            System.err.println("-----------注销登录成功-----------");
        }
    }