Hutool 3.9 ((free)) 99%
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Hutool is a popular open-source, comprehensive Java tool library designed to make Java development "sweet" by providing a vast collection of utility methods encapsulated in static classes. While the project has evolved significantly beyond version 3, understanding the foundational principles of early versions like reveals the core philosophy of this indispensable tool.
Hutool is a popular Java library that provides a wide range of utility functions and tools to simplify Java development. Here are some key features and updates in Hutool 3.9:
Hutool 3.x focused on refining its vast utility collection. Here are the key components that made version 3.9 reliable: 1. Hutool 3.9
The file reading methods were optimized for better performance with large files. 4. String and IO Utilities ( StrUtil , IoUtil )
Complete Guide to Hutool 3.9: Streamlining Java Development Java developers often struggle with verbose boilerplate code. Built-in Java libraries require multiple lines of code for simple operations like reading files, validating strings, or encrypting data. Hutool solves this exact problem.
| Feature | Hutool 3.9 | Hutool 5.8 (latest) | Apache Commons (Lang3 + IO) | | :--- | :--- | :--- | :--- | | | Java 8 | Java 8+ (module support) | Java 8 | | External Dependencies | None | Optional (JSON, JWT) | None | | API Stability | Frozen (mature) | Evolving | Stable | | File Watching | Basic | WatchUtil (advanced) | No built-in | | Learning Curve | Low | Medium (many modules) | Medium (split across jars) | | Best For | Legacy projects, Simple JARs | New greenfield projects | Large enterprise | This public link is valid for 7 days
Streamlined Excel ( HSSFWorkbook , XSSFWorkbook ) and Word processing.
import com.xiaoleilu.hutool.io.FileUtil; import com.xiaoleilu.hutool.convert.Convert; import com.xiaoleilu.hutool.date.DateUtil; // 1. Read file content String content = FileUtil.readString("config.txt", "UTF-8"); // 2. Convert type Integer port = Convert.toInt(content.trim()); // 3. Get current time String now = DateUtil.now(); System.out.println("Started on port " + port + " at " + now); Use code with caution. Conclusion
Hutool 3.9 is a great choice for Java developers who want to write clean, fast code. It takes away the headache of everyday tasks so you can build your project faster. Can’t copy the link right now
<dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.8.28</version> <!-- Or the latest 5.x version --> </dependency>
The most common usage involves passing a URL and a map of parameters: HashMap paramMap = HashMap<>(); paramMap.put( // Returns the response body as a String String result = HttpUtil.post( "https://example.com" , paramMap); Use code with caution. Copied to clipboard Advanced POST (Chain Building) If you need to customize headers or timeouts, use the HttpRequest String result = HttpRequest.post( "https://example.com" ) .header(Header.USER_AGENT, "Hutool http" // Add custom headers .form(paramMap) // Add form parameters // Set timeout in milliseconds .execute() .body(); // Get the response body Use code with caution. Copied to clipboard POST JSON Data To send a raw JSON body instead of form parameters, use the method with a JSON string: String json = "\"name\": \"hutool\"" ; String result = HttpRequest.post( "https://example.com" ) .body(json) .execute() .body(); Use code with caution. Copied to clipboard or specific response headers with Hutool?
All aspects of Java development (Strings, Files, Dates, HTTP, Cryptography). Core Utility Modules in Hutool 3.x
