Hutool 3.9 Updated «FRESH - 2026»

// 6. Encryption: Calculate MD5 String text = "password123"; String md5Hex = SecureUtil.md5(text); System.out.println("MD5 of 'password123': " + md5Hex); }

Hutool-http in 3.9 allowed for "fluent" API calls. Instead of configuring a HttpURLConnection manually, you could simply write: String result = HttpUtil.get("https://example.com"); Use code with caution. 3. Simplified File Operations

Hutool is split into separate pieces. You can use the whole library, or you can pick just the pieces you need. 1. Core Tools (hutool-core)

: The method names are intuitive (e.g., isBlank , isEmpty , unzip ).

Version 3.x used older package命名 semantics. When migrating from 3.x to 5.x, class locations change significantly (e.g., com.xiaoleilu.hutool transitioned over time to cn.hutool ). Hutool 3.9

// Chainable: watch specific file pattern public WatchBuilder onFiles(String globPattern, FileHandler handler) patternHandlers.put(globPattern, handler); return this;

Hutool 3.9 is categorized into several distinct modules, allowing developers to include only what they need:

Version 3.9 represents a highly stable, mature milestone in the legacy 3.x release line. It acts as an "all-in-one" alternative to scattered dependencies like Apache Commons, Guava, and Jackson. By wrapping complex code into static methods, Hutool 3.9 optimizes productivity, reduces the learning curve for junior developers, and minimizes the risk of common bugs like NullPointerException . 📦 Core Architecture and Modules

Optimized static methods ensure high performance with minimal object creation. descriptive | Abbreviated | Intuitive

To use specific modules, you can replace hutool-all with a module name like hutool-http or hutool-crypto .

// 4. File I/O: Read and write files in one line FileWriter writer = new FileWriter("test.txt"); writer.write("Hello, Hutool!"); FileReader reader = new FileReader("test.txt"); String content = reader.readString(); System.out.println("File content: " + content); // Output: Hello, Hutool!

All aspects of Java development (Strings, Files, Dates, HTTP, Cryptography). Core Utility Modules in Hutool 3.x

Paper Title: Hutool 3.9: Bridging the Gap in Early Java Toolset Evolution 1. Abstract Chinese-friendly Javadoc |

For example, instead of writing SimpleDateFormat and dealing with ParseException , you write DateUtil.parse(dateStr) . Instead of nested if (obj == null) checks, you use ObjectUtil.defaultIfNull() .

After the , Hutool continued its evolution with:

| Feature | Java Standard Library | Apache Commons Lang | Hutool 3.9 | | :--- | :--- | :--- | :--- | | | Verbose ( HttpURLConnection ) | External Dependency ( HttpClient ) | Built-in, Zero Dependency | | File Copy | Requires InputStream / OutputStream boilerplate | IOUtils.copy | FileUtil.copy (Handles exceptions & closing) | | JSON Parsing | External dependency required | Not included | Built-in Lightweight Parser | | Learning Curve | Low (Standard API) | Medium | Low (Method Chaining) | | Method Naming | Strict, descriptive | Abbreviated | Intuitive, Chinese-friendly Javadoc |