判断一个对象属性是否为null加强版

对之前做的版本进行改进，并添加了一些新的方法

 public class ObjectCheckUtils {

/**
 * 判断obj对象所有属性是否为空（除去static final类型）
 * @param obj
 * @return
 */
public static boolean objFieldsIsEmpty(Object obj) throws IllegalAccessException {
    for(Field f : getFields(obj)){
        f.setAccessible(true);
        if(Modifier.isFinal(f.getModifiers())&&Modifier.isStatic(f.getModifiers())){
            continue;
        }
        if(!isEmpty(f.get(obj))){
            f.setAccessible(false);
            return false;
        }
        f.setAccessible(false);
    }
    return true;
  }
  /**
   * 判断obj对象某个fileName属性是否为空
   * @param obj
   * @return
   */
  public static boolean objFieldIsEmpty(Object obj,String fileName) throws IllegalAccessException {
    Field f = getFieldByFieldName(obj,fileName);
    f.setAccessible(true);
    Object value = f.get(obj);
    f.setAccessible(false);
    if(isEmpty(value)) {
        return true;
    }
    return false;
  }
  /**
   * 判断obj对象多个fileName属性是否都为空
   * @param obj
   * @return
   */
  public static boolean objFieldIsEmpty(Object obj,String ... fileName) throws IllegalAccessException {
    boolean res = true;
    for(String file:fileName){
        if(!objFieldIsEmpty(obj,file)){
            res = false;
        }
    }
    return res;
  }
  /**
   * 获取obj对象fieldName的Field
   * @param obj
   * @param fieldName
   * @return
   */
  public static Field getFieldByFieldName(Object obj, String fieldName) {
    for (Class superClass = obj.getClass(); superClass != Object.class; superClass = superClass
            .getSuperclass()) {
        try {
            return superClass.getDeclaredField(fieldName);
        } catch (NoSuchFieldException e) {
        }
    }
    return null;
  }
  /**
   * 获取obj对象所有的Field(包括父类)
   * @param obj
   * @return
   */
  public static Field[] getFields(Object obj) {
    Field[] result = new Field[]{};
    Field[] second;
    for (Class superClass = obj.getClass(); superClass != Object.class; superClass = superClass
            .getSuperclass()) {
        second = superClass.getDeclaredFields();
        result = ArrayUtils.addAll(result, second);
    }
    return result;
  }
  /**
   * 判断obj对象是否为空
   * @param obj
   * @return
   */
  @SuppressWarnings("rawtypes")
  public static boolean isEmpty(Object obj) {
    if (obj == null) {
        return true;

    } else if (obj instanceof String && (obj.toString().trim().equals(""))) {
        return true;

    } else if (obj instanceof Number && ((Number) obj).doubleValue() < 0) {
        return true;

    } else if (obj instanceof Collection && ((Collection) obj).isEmpty()) {
        return true;

    } else if (obj instanceof Map && ((Map) obj).isEmpty()) {
        return true;

    } else if (obj instanceof Object[] && ((Object[]) obj).length == 0) {
        return true;

    }
    return false;
  }
}