String m="<responses><response><order_serial_no>points_901</order_serial_no><mail_no></mail_no><status>1</status></response></responses>";
Document doc = null;
String status = "";
try {
            doc = DocumentHelper.parseText(m);
            Element rootEl=doc.getRootElement(); //获取文件中的根节点
      for (Iterator bz_it = rootEl.elementIterator("Invoice"); bz_it.hasNext();) {
                          Element child = (Element) bz_it.next();
                          status= child.element("status").getText();
                          System.out.println(status);
}
} catch (DocumentException e) {
e.printStackTrace();
}