发表于

校验

判空：

工具类Tools，Tools.isEmpty(); Tools.isNotEmpty();。适用于对象判空。

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public static boolean isEmpty(Object obj) {
    if (obj == null) {
        return true;
    } else if (obj instanceof CharSequence) {
        return ((CharSequence)obj).length() == 0;
    } else if (obj instanceof Collection) {
        return ((Collection)obj).isEmpty();
    } else if (obj instanceof Map) {
        return ((Map)obj).isEmpty();
    } else if (!(obj instanceof Object[])) {
        return false;
    } else {
        Object[] object = (Object[])((Object[])obj);
        if (object.length == 0) {
            return true;
        } else {
            boolean empty = true;

            for(int i = 0; i < object.length; ++i) {
                if (!isEmpty(object[i])) {
                    empty = false;
                    break;
                }
            }
            return empty;
        }
    }
}

工具类CollectionUtils，CollectionUtils.isEmpty(); CollectionUtils.isNotEmpty();。适用于集合判空。

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public static boolean isEmpty(Collection coll) {
    return coll == null || coll.isEmpty();
}

// 低级示范
if(list != null && !list.isEmpty()){
    // 这个里面取list中的值
}else{
    // 做其他处理
}

工具类EmptyCheckUtil，EmptyCheckUtil.check(Object obj, boolean exclude, Sring... params); EmptyCheckUtil.checkAll();

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public static void check(Object bean, boolean exclude, String... params) throws Exception {
    if (bean == null) {
        throw new ServiceException(DefaultResultStatus.PARAM_NOT_EMPTY);
    } else {
        Class type = bean.getClass();
        BeanInfo beanInfo = Introspector.getBeanInfo(type);
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        boolean needCheck = exclude;
        for(int i = 0; i < propertyDescriptors.length; ++i) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();
            Method readMethod = descriptor.getReadMethod();
            Object result = readMethod.invoke(bean);
            String[] var12 = params;
            int var13 = params.length;
            for(int var14 = 0; var14 < var13; ++var14) {
                String param = var12[var14];
                if (param.equals(propertyName)) {
                    needCheck = !exclude;
                    break;
                }
            }
            if (needCheck && (result == null || "".equals(result))) {
                throw new ServiceException(DefaultResultStatus.PARAM_NOT_EMPTY.getStatusCode(), propertyName + "不能为空！");
                needCheck = exclude;
            }
        }
    }

字符串判空，标准写法

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String test = null;
if(result == null || "".equals(result)){
    // true
}

注解

springboot注解

@Cacheable 缓存注解