如何使用Java从JIRA下载报告

Question

我试图通过以下java代码下载JIRA Tempo报告但是失败了。我可以知道可能或如何做到这一点？我认为主要问题是无法获取登录身份验证，因为我只能下载登录页面。感谢。

public static void saveFile(URL url, String file) throws IOException {
    Authenticator.setDefault(new Authenticator() {
        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
            String password = "XXXXX";
            String username = "XXXXX";
            return new PasswordAuthentication(username, password.toCharArray());
        }
    });

    InputStream in = url.openStream();
    FileOutputStream fos = new FileOutputStream(new File(file));

    int length = -1;
    byte[] buffer = new byte[1024];
    while ((length = in.read(buffer)) > -1) {
        fos.write(buffer, 0, length);
    }

    fos.close();
    in.close();
}

public static void main(String args[]) throws IOException {

    try {
        URL url = new URL("https://XXXX.atlassian.net/TempoProjectBoardXXXX");
        String fileName = "report.xls";
        saveFile(url, fileName);

    } catch (IOException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}