Fast file reading ( readLines ), file deletion, file copying, and obtaining file extensions.
Methods handle null safely, preventing NullPointerException .
Here is an interesting look at the legacy of Hutool 3.9 and how it shaped modern Java utility libraries. 1. The "Anti-Copy-Paste" Revolution
The core module contains fundamental utilities for foundational Java types and operations. It eliminates the need for Apache Commons Lang or Guava in standard use cases. 2. Hutool-json: Lightweight Parsing Hutool 3.9
era (released around 2017) remains a fascinating milestone. It was the exact period when the library transitioned from a small corporate helper project into a massive open-source phenomenon.
(Note: For the latest active versions, it is highly recommended to check the official Maven Central Repository to ensure you are utilizing the most updated, secure release).
This article provides an overview of Hutool 3.9 features based on its historical, stable 3.x architecture. 9 to a newer version like 5.x? Provide a for a particular module? Explain how to import it into Maven/Gradle? Fast file reading ( readLines ), file deletion,
If you only require string utilities and file operations, import hutool-core instead of hutool-all to keep your deployment package as small as possible.
: Converting an object to a string or safely parsing an integer with default fallback values. 2. String & Text Utilities ( StrUtil and StrSpliter )
Hutool 3.9涵盖了你日常开发中的几乎所有需求，其丰富的功能模块库涵盖了数十个常用工具类。下面从几个最有代表性的模块来介绍： functional HTTP client.
One of the most interesting aspects of the 3.9 build was its strict adherence to a zero-dependency
import cn.hutool.crypto.SecureUtil; import cn.hutool.crypto.symmetric.SymmetricAlgorithm; import cn.hutool.crypto.symmetric.SymmetricCrypto; public class CryptoExample public static void main(String[] args) // Generate MD5 Digest String testStr = "secret_password"; String md5Hex = SecureUtil.md5(testStr); System.out.println("MD5: " + md5Hex); // Symmetric AES Encryption byte[] key = SecureUtil.generateKey(SymmetricAlgorithm.AES.getValue()).getEncoded(); SymmetricCrypto aes = SecureUtil.aes(key); // Encrypt and Decrypt String encryptHex = aes.encryptHex(testStr); String decryptStr = aes.decryptStr(encryptHex); System.out.println("AES Encrypted (Hex): " + encryptHex); System.out.println("AES Decrypted: " + decryptStr); Use code with caution. Best Practices and Strategic Adoption
Automatic conversion of strings to numeric types or Date objects, handling formatting issues implicitly. 5. HTTP Client ( HttpUtil ) Hutool 3.x brought a simple, functional HTTP client. Simplicity: Executes GET or POST requests in one line.
