Hutool 39 Jun 2026

The Assert utility added a dedicated method to safely evaluate whether a targeted collection is explicitly empty, complete with modular unit test suites. This closes a minor functional gap for developers who previously had to combine CollUtil.isEmpty() with boolean assertions. Performance & Engine Optimizations 1. High-Performance Copiers ( XXXToMapCopier )

The 5.8.x series has been battle-tested in countless production environments.

Recursively list all files in a directory (excluding directories themselves).

Designed to be a small library with no external dependencies, minimizing conflict issues.

is a small, yet powerful Java utility library that encapsulates common methods in a friendly, fluent API. Version 3.9.x focuses on:

The most notable expansion in Hutool 5.8.39 centers around its ai module, catering to modern enterprise demands for Large Language Model (LLM) orchestration:

// Object to JSON User user = new User("John", 30); String json = JSONUtil.toJsonStr(user); // JSON to Object User user2 = JSONUtil.toBean(json, User.class); Use code with caution. 4. Hutool 3.x vs. Other Utilities (Apache Commons/Guava)

: Performance profiles for XXXToMapCopier schemas have been overhauled to minimize memory overhead when mutating heavy POJOs into Java Maps.

Provides easy-to-use wrappers for encryption, decryption, and digital signatures.

Mitigates OOM scenarios via a global FetchSize baseline option. HttpConfig Networking

// With Hutool 3.9 – 6 lines String csvData = HttpUtil.get("https://example.com/data.csv"); List<String> lines = StrUtil.split(csvData, '\n'); List<String> filtered = CollUtil.filter(lines, line -> line.contains("active")); FileUtil.writeLines(filtered, "/tmp/filtered.csv", CharsetUtil.UTF_8);