Hutool 3.9 -

For those on , the latest 5.x series is the recommended choice. It offers the newest features, performance improvements, and security patches. However, if you are stuck on JDK 7 , the 4.x series is your best and only option, as Hutool 5.x and later are not compatible with it. The 3.x series is now considered legacy, but its structure and APIs are largely forward-compatible.

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: Enhanced support for newer JDK versions (at the time), ensuring that standard tools worked seamlessly with the modularized Java system. nami-channel-http-hutool

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

SymmetricCrypto aes = new AES(key.getBytes()); String encryptedText = aes.encrypt(text); System.out.println("Encrypted text: " + encryptedText);

Hutool is a portmanteau of "HU" (a Chinese character meaning "exchange" or "cooperation") and "Tool". It is a comprehensive Java utility class library that replaces traditional Apache Commons, Guava, and native Java boilerplate code. The Core Philosophy

: Simplifies file reading, writing, and directory management, removing the need for repetitive stream-handling code. For those on , the latest 5

Hutool is not a monolithic giant; it is a carefully organized ecosystem of highly specialized modules. In version 3.9, these modules are structured to cover almost every standard API bottleneck in Java SE. 1. Core Utilities ( hutool-core )

public class QuickStart { public static void main(String[] args) { // 1. HTTP请求 String result = HttpUtil.get("https://api.example.com/data"); System.out.println("API响应：" + result);

com.xiaoleilu hutool-all 3.9.9 Use code with caution. Share your experience in the comments below

Implementing MD5, SHA-256, AES, or RSA encryption natively in Java requires dealing with complex MessageDigest and Cipher classes. Hutool 3.9's SecureUtil democratizes security tools for everyday use.

Providing the necessary credentials or backdoors to gain deep system access to the automotive hardware. Component Recovery:

| Module Name | Official Description | Technical Role in the Project | | :--- | :--- | :--- | | | Core, including Bean operations, dates, and various Utilities. | This is the heart of the library . It contains the foundational tools like StrUtil , DateUtil , CollUtil , FileUtil , Convert , ObjectUtil , and ReflectUtil used across every other module. | | hutool-log | A log facade that automatically identifies the logging implementation. | Provides a unified logging interface that auto-detects and delegates to frameworks like SLF4J, Log4j, or Logback, simplifying logging setup in your application. | | hutool-setting | A more powerful encapsulation of Setting configuration files and Properties. | Extends standard .properties files with support for a more robust Setting format, allowing for grouped configurations, variable substitution, and auto-reload, which is more powerful than java.util.Properties . | | hutool-crypto | Encryption and decryption module, providing symmetric, asymmetric, and digest algorithm encapsulation. | This is your go-to for security . It wraps JDK's JCA (Java Cryptography Architecture) to provide easy-to-use APIs for encryption (AES, DES), hashing (MD5, SHA), and digital signatures (RSA, DSA). | | hutool-http | An HTTP client encapsulation based on HttpUrlConnection . | Provides simple and convenient methods ( HttpUtil.get() , HttpUtil.post() ) for making HTTP requests, handling redirections, and processing responses without requiring external HTTP client libraries. | | hutool-db | JDBC-encapsulated data operations, based on the ActiveRecord design pattern. | A lightweight ORM (Object-Relational Mapping) tool that simplifies database operations. It allows you to execute SQL and map results to JavaBeans without the complexity of full-fledged ORM frameworks like Hibernate. | | hutool-aop | JDK dynamic proxy encapsulation, providing aspect support outside of IOC containers. | Enables simple Aspect-Oriented Programming (AOP) without Spring. It allows you to create proxy objects and intercept method calls, useful for tasks like logging, transaction management, or performance monitoring. | | hutool-cache | Simple cache implementation. | Offers a straightforward Cache interface with implementations like FIFOCache and LRUCache , perfect for local, lightweight in-memory caching needs. | | hutool-cron | Scheduled task module, providing a Crontab-like expression-based scheduler. | A lightweight, built-in cron expression scheduler. It allows you to define and run periodic tasks (e.g., CronUtil.schedule("*/5 * * * * *", () -> System.out.println("Task executed")) ) without relying on external schedulers like Quartz. | | hutool-captcha | Image captcha generation. | Generates simple CAPTCHA images programmatically, which can be used to prevent automated form submissions in web applications. | | hutool-dfa | Multi-keyword lookup based on the DFA model. | Implements a Deterministic Finite Automaton for high-performance filtering of sensitive words or keywords in a text, which is crucial for content moderation systems. | | hutool-extra | Extension module, encapsulating third-party libraries (template engines, mail, servlet, QR code, emoji, FTP, tokenizer, etc.). | This is the integration hub . It provides optional wrappers for popular third-party libraries like template engines (Freemarker, Velocity), mail sending, QR code generation, and various other utilities. Dependencies are optional. | | hutool-json | JSON implementation. | A built-in, lightweight JSON parser and formatter, offering an alternative to libraries like Jackson or Gson when you need simple JSON operations without extra dependencies. | | hutool-bloomFilter | Bloom filter, providing a Bloom filter with some hash algorithms. | Provides a probabilistic data structure for efficiently testing whether an element is a member of a set. It's useful in cases where you need to avoid unnecessary operations on non-existent items, such as in a database read-through scenario. | | hutool-poi | Encapsulation of Excel and Word using POI. | This module simplifies working with Microsoft Office documents via Apache POI, making it easy to read and write Excel files with fewer lines of code. | | hutool-socket | Socket encapsulation based on Java's NIO and AIO. | Provides a simplified API for socket programming, including a server and client implementation, which can be used for building custom network communication protocols. | | hutool-system | System parameter invocation encapsulation (e.g., JVM information). | Allows easy access to system-level information, such as JVM spec, runtime details, and OS information, which is helpful for debugging and system monitoring. |