Senior Brother's Insights

May 29, 2022 · Backend Development

Three Java Ways to Dynamically Monitor File Changes: Polling, WatchService, and Commons‑IO

To handle dynamic file changes such as rule updates, configuration reloads, or log monitoring, this article compares three Java approaches—simple polling with File#lastModified, the OS‑integrated WatchService API, and the Apache Commons‑IO monitor—detailing their implementations, advantages, drawbacks, and practical usage tips.