Hutool 3.9

// 2. 日期处理 String now = DateUtil.now(); // 得到"2026-05-29 14:30:00" System.out.println("当前时间：" + now);

This article explores the core features, design philosophy, and utility of the era, demonstrating why it became a favorite "Swiss Army Knife" for Java developers seeking to minimize boilerplate code. What is Hutool 3.x?

: Concise methods for filtering and transforming lists and sets.

To understand the efficiency gains of Hutool 3.9, let's examine common development scenarios contrasted with standard JDK approaches. Date and Time Manipulation ( DateUtil ) Hutool 3.9

Have you used Hutool 3.9 in production? Share your experience in the comments below.

If you are looking to migrate from 3.x to the latest 5.x version, or need specific examples of how to replace boilerplate code, let me know!

// JSON JSONObject json = JSONUtil.createObj() .set("name", "Hutool") .set("version", "3.9"); : Concise methods for filtering and transforming lists

represents a critical historical milestone in the evolution of Hutool, a popular open-source Java tool library designed to simplify boilerplate code . Released during the Java 8 era, version 3.9 solidified Hutool's philosophy of "keeping it sweet and simple" by providing robust utilities for cryptography, file I/O, string manipulation, and network operations before the framework transitioned to its major 4.x and 5.x architectures.

Static helper methods inside Hutool 3.9 modules like StrUtil , DateUtil , and CollectionUtil are stateless and fully safe to use in multi-threaded, concurrent enterprise environments.

Replaces the need for custom "Util" packages that often lead to bugs due to imperfect encapsulation. Share your experience in the comments below

Which (like Excel processing or JSON mapping) do you want to explore deeper? What Java version is your current target system running? Share public link

: Modules are built with static methods, allowing developers to invoke powerful logic in a single line of code.

To add Hutool to your Java project, you simply need to declare the dependency in your build tool. For , add the following snippet to your pom.xml :

Hutool 3.9.x was released circa late 2018 – early 2019 . The current major version is 5.x/6.x. This report focuses on features introduced and stabilized in the 3.9 branch.

For modern projects, it is highly recommended to use the latest versions (5.x or 6.x) found on Maven Central or GitHub for better compatibility with Java 8 and above. hutool/README-EN.md at v5-master - GitHub