Warning:() ‘isEmpty(java.lang.Object)‘ is deprecated . StringUtils.isEmpty

原创已于 2023-05-12 10:56:53 修改 · 2k 阅读

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于 2023-05-12 10:53:54 首次发布

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文章讨论了Spring框架中StringUtils.isEmpty方法被废弃的情况，建议使用ObjectUtils.isEmpty替代，以避免可能的隐藏bug。ObjectUtils.isEmpty方法对多种数据类型进行了兼容，提供更安全的空值检查。开发者应该更新代码并进行测试以确保正确性。

使用springframe的 StringUtils 提示 Warning:() 'isEmpty(java.lang.Object)' is deprecated

isEmpty方法废弃了。

参考：

Deprecate `StringUtils.isEmpty(Object)` and replace remaining usage (e.g. with `ObjectUtils.isEmpty`) · Issue #25945 · spring-projects/spring-framework · GitHub

如下：可能会有隐藏bug：

With static imports code like this looks perfectly fine:

        List<String> data = ...

        if (isEmpty(data)) {
But if the import has StringUtils.isEmpty the condition above will not work correctly for empty List introducing a hidden, difficult to spot bug.

If you are really keen on keeping this method it would be better to rename it to isEmptyString to at least make the error more obvious. (I believe this name also matches the method intention better than generic isEmpty.)

But with the #17710 in place I do not think StringUtils.isEmpty(Object) is still needed. And should probably be deprecated and eventually removed.

如上所示，StringUtils.isEmpty()可能会导致一个隐藏bug。

Replace deprecated StringUtils.isEmpty() by ObjectUtils.isEmpty() and cover its usage with tests jhipster/generator-jhipster#13369

可以使用ObjectUtils.isEmpty(Object) 方法替换StringUtils.isEmpty()就可以。

ObjectUtils.isEmpty 代码如下：兼容了各种场景使用比较方便

    public static boolean isEmpty(@Nullable Object obj) {
        if (obj == null) {
            return true;
        } else if (obj instanceof Optional) {
            return !((Optional)obj).isPresent();
        } else if (obj instanceof CharSequence) {
            return ((CharSequence)obj).length() == 0;
        } else if (obj.getClass().isArray()) {
            return Array.getLength(obj) == 0;
        } else if (obj instanceof Collection) {
            return ((Collection)obj).isEmpty();
        } else {
            return obj instanceof Map ? ((Map)obj).isEmpty() : false;
        }
    }

参考：

Deprecate `StringUtils.isEmpty(Object)` and replace remaining usage (e.g. with `ObjectUtils.isEmpty`) · Issue #25945 · spring-projects/spring-framework · GitHub