Hutool is a lightweight Java toolkit that provides a wide set of utilities to simplify everyday development tasks (I/O, collections, date/time, crypto, HTTP, reflection, etc.). Version 3.9 continues that approach with several notable improvements, bug fixes, and additions that make common operations simpler and safer.
FileUtil EnhancementsIssue: Fixed issues related to path handling in file operations, specifically dealing with symbolic links and cross-platform path separators. Impact: Developers working on file management systems or migration tools will find operations more reliable, especially on Linux/Unix systems.
StrUtil.subBetween() now returns null (instead of empty string) when the delimiters aren’t found. This aligns with “absent” semantics. A quick grep of your codebase will catch any affected calls.
// Resize every PNG in a directory, keeping EXIF data
File[] images = FileUtil.ls("/photos");
for (File img : images)
ImgUtil.scale(img, FileUtil.file("/thumbnails", img.getName()), 0.5f);
// New in v39: Preserves orientation using ImageMetadataReader
The versioning strategy of Hutool—moving from 5.7 to 5.8—signaled a commitment to "small but beautiful" updates. Unlike major framework upgrades that often break backward compatibility, Hutool focuses on additive utility.
In version 5.8.39 specifically, the focus is on stability and edge-case handling. It reflects a library that has moved past its "wild growth" phase into a "maintenance and polish" phase. It offers specific tools for common Chinese business scenarios (such as the ChineseWordUtil or ID card validation) which are often missing from Western-centric libraries, making it uniquely valuable for developers in that market.
Hutool 3.9 – The Java utility library that actually respects your time
If you write Java daily, you already know the pain:
if (list != null && !list.isEmpty()) repeated 100 times.
Hutool 3.9 doesn’t just patch things — it makes real workflow improvements:
✨ CollStream
Functional-style collection grouping & filtering without Stream API verbosity.
✨ BeanUtil.copyToList
Copy list of beans to another type in one line.
✨ DateUtil.truncate
Finally – zero out hours/minutes/seconds without Calendar hell.
✨ CsvWriter enhancements
Proper RFC-compliant escaping + file appending.
✨ Improved IdcardUtil
Better validation for Chinese ID cards, plus stricter checks.
→ Why upgrade from 3.8?
3.9 is backward-compatible, smaller footprint, and fixes several edge-case bugs in date & file handling.
📌 Upgrade with Maven:
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>3.9.0</version>
</dependency>
Stop reinventing the wheel. Let Hutool handle the boring stuff.
#Java #OpenSource #Hutool
If you actually meant version 39.x (maybe a typo for 5.x or a different lib), let me know and I’ll rewrite accordingly. Hutool’s latest stable is 5.8.x — so 3.9 is older but still widely used in legacy projects.
DateUtil#formatISO() is deprecated in favorThe keyword "Hutool 3.9 new" primarily refers to the 3.9 update of the HU Engineering Tool (often shortened to Hutool in automotive circles), a specialized software used for BMW head unit (HU) engineering, coding, and retrofitting. This update is significant for automotive enthusiasts and professionals working with NBT and NBTevo units. Overview of Hutool 3.9
Hutool 3.9 (and its rebranding as HUTool Hex-Pro) introduced critical capabilities for handling newer vehicle integration levels (I-Steps) and head unit management. While Hutool also refers to a popular Java utility library, the specific version "3.9" is most famously associated with the BMW engineering tool release. Key New Features in Hutool 3.9
The 3.9 update brought several "exclusive" functions designed to simplify complex retrofitting tasks:
EEPROM Wiping: This is considered the most critical addition. It allows users to "wipe" the EEPROM of an NBTevo unit, which is essential when installing a used head unit into a different vehicle or recovering a unit after a failed firmware update.
Support for Newer I-Steps: Version 3.9 is specifically required for handling BMWs with newer integration levels, such as those from late 2019 onwards (e.g., I-Level 1119).
Enhanced Cookie Management: For cloud-based interactions, it offers better automated management of cookies across multiple requests within a single session.
CarPlay Activation: Improved support for generating FSC (Freischaltcode) codes, including number 143 for Apple CarPlay, even on newer firmware versions that previously blocked USB-based activation. Hutool 3.9 vs. Other Versions Hutool 2.6 (Older) Hutool 3.9 (Newer) Connectivity Primarily Local/USB Cloud-based updates I-Step Support Older versions (pre-2019) Support for 1119+ I-Levels NBTevo Wipe Not available Included Interface Rebranded as Hex-Pro 2.8+ Application Scenarios
Head Unit Retrofitting: When moving an NBTevo unit from a donor car to a new one, Hutool 3.9 can reset the unit's identity to match the new VIN.
Feature Activation: Enabling hidden features like Apple CarPlay, Android Auto, or custom navigation maps.
Firmware Recovery: Fixing units that have become unresponsive (bricked) during unsuccessful software updates. Important Note for Developers chinabugotech/hutool: A set of tools that keep Java sweet.
Hutool 5.3.9 introduces significant enhancements to Java development, featuring strengthened cryptography (SM2), advanced Excel data exporting, and improved system hardware monitoring via OSHI. Key updates include ExcelWriter.setOnlyAlias hutool 39 new
for custom export formatting, enhanced HTTP client capabilities, and critical security patches for file operations [1]. For complete details, visit the Hutool website.
Reviewing the Hutool 39-Piece All-Purpose Household Tool Kit
reveals it is a highly regarded, budget-friendly set ideal for everyday home maintenance and DIY projects. While it lacks professional-grade durability for heavy construction, it is praised for its portability and organization. Performance & Value
Cost-Effectiveness: Users frequently highlight its excellent value, especially when found at retailers like Walmart or as a Costco-exclusive deal, where it often retails between $40 and $80.
Ideal for Beginners: Reviewers often recommend it as a "perfect starter set" for college students, new homeowners, or as a handy backup kit for small apartment repairs.
Convenience: The tools are housed in a sturdy, blow-molded case that keeps everything organized and easy to carry for quick fixes. Key Features
Comprehensive Selection: Includes essentials like a hammer, tape measure, utility knife, and a wide array of screwdriver bits.
Durability: While functional for light tasks, some users note the tools feel less robust than high-end brands; specifically, screwdriver tips may be shorter than standard industrial versions.
Variety: Available in multiple colors, including pink, which some users find helps prevent "borrowing" by other family members. Pros and Cons Extremely affordable for the number of pieces included. Not intended for heavy-duty or professional use. Lightweight and compact for easy storage in drawers.
Lacks specialty tools like needle-nose pliers or wire cutters. Organized case ensures you notice if a tool is missing.
Screwdriver bits can be undersized for some deep-set screws.
“This kit has the basics, all packed in a nice case. When you open it up and lay it flat, all the tools are neatly arranged before your very eyes.” Walmart
“I bought this for my grandson and he said it's a perfect starter tool set. It actually had more tools than I thought.” Walmart
Is the HOTO Toolkit at Costco for $40 Worth It? Honest Review! Hutool 3
Neptune 39 new features Hutool "Hutool 39 new" typically refers to the 3.9.0 release of the Java toolset
, a milestone version that significantly expanded its utility library to simplify common Java development tasks.
Hutool is designed to reduce the "learning cost" of complex APIs by providing static methods that handle boilerplate code for encryption, networking, and file management. Key Features of the 3.9 Update
The 3.9 series introduced a variety of enhancements across its core modules, focusing on making the library even more "all-encompassing" for Java developers. Maven Repository Module Utilities : New static methods were added to the
module to handle complex collection manipulations and string parsing more elegantly. Enhanced HTTP Support hutool-http
component received updates to better handle client requests and responses, streamlining how developers interact with web services. Cryptographic Improvements : Improvements to hutool-crypto
provided safer and easier-to-use wrappers for common encryption algorithms, reducing the risk of implementation errors. JSON Handling hutool-json
module was refined to offer faster serialization and deserialization, often used as a lightweight alternative to larger libraries like Jackson or FastJSON. Maven Repository Why Developers Use This Version
Even as newer versions like 5.x become standard for JDK 8+, the 3.x and 4.x branches remain relevant for legacy environments. The "39 new" release solidified Hutool's reputation as a "swiss-army knife" for Java because: Zero Dependencies
: Hutool modules generally do not require third-party libraries, keeping your project's JAR footprint small. Functional Elegance
: It shifts Java toward a more functional style, allowing for cleaner code that reads like natural language.
For developers currently building or maintaining projects, you can find the latest stable releases (such as 5.8.44) and full documentation on the Hutool Maven Repository
showing how to use one of these new Hutool utilities in a project? cn.hutool - Maven Repository