LoginEntity loginEntity = new LoginEntity();//任意实体类
Map map = new HashMap();
Field[] fields = object.getClass().getDeclaredFields();
for (Field field : fields) {
    field.setAccessible(true);
    try {
        map.put(field.getName(), field.get(loginEntity));

    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }
}