public void test_for_issue() throws Exception {
    Map<String, Object> map= new HashMap<String, Object>();
    map.put("enumField", 0);

    AbstractBean bean = JSON.parseObject(JSON.toJSONString(map), ConcreteBean.class);
    assertEquals(FieldEnum.A, bean.enumField);
}

public static class AbstractBean {
    public FieldEnum enumField;
}

public static class ConcreteBean extends AbstractBean {

}

public static enum FieldEnum { A, B }

支持ordinal，但是你传入的必须是数值，而不是字符串