public InputStream code() throws HttpException, IOException {
        GetMethod get = new GetMethod(VERIFY_CODE);
        get.setRequestHeader(USER_AGENT_H, USER_AGENT);
        get.setRequestHeader("Cookie", this.cookiestr);
        NameValuePair[] params = new NameValuePair[]{
                new NameValuePair("username", this.loginUser),
                new NameValuePair("r", "1365318662649")};
        get.setQueryString(params);
        int status = client.executeMethod(get);
        if (status == HttpStatus.SC_OK) {
            return get.getResponseBodyAsStream();
        }
        return null;
    }