Hutool 3.9 ^new^ ❲LATEST ✯❳

Hutool 3.9 was a historical release in the lifecycle of the Hutool project, a popular open-source Java tool library designed to reduce the cost of learning APIs and increase productivity by providing simple static methods for common tasks.   Project Philosophy   The core mission of Hutool is to make Java development "sweet". It achieves this by:   Encapsulation : Wrapping complex native Java APIs into easy-to-use static methods. Efficiency : Reducing the time developers spend writing boilerplate utility classes. Comprehensive Coverage : Providing tools for nearly every aspect of Java development, including file manipulation, date handling, networking, and security.   Key Functional Areas   While version 3.9 has since been succeeded by major versions like Hutool 5.x , the library's foundational tools established during the 3.x era remain central to its identity:   Date and Time Utilities ( DateUtil ) : Highly intuitive methods for parsing, formatting, and calculating date differences that often surpass the convenience of native Java 8 time APIs. File and IO ( FileUtil ) : Simplifies file reading, writing, and directory management, removing the need for repetitive stream-handling code. Networking ( HttpUtil ) : Offers a streamlined way to make HTTP requests (GET, POST) without the complexity of traditional clients like Apache HttpClient. Conversion and Validation : Automated tools for converting between data types and validating strings (e.g., checking if a string is a valid email or phone number).   Significance of the 3.x Branch   The 3.9 release served as a stable milestone before the project transitioned toward more modern Java features and performance optimizations in later versions. For many developers, Hutool 3.x was the entry point into using a "Swiss Army Knife" style utility library to replace fragmented internal util packages.   hutool/README-EN.md at v5-master - GitHub

Hutool is a small but comprehensive Java tool library designed to simplify development by providing an extensive set of static methods for common tasks. While version is an older release from March 2018, it helped lay the foundation for the library's reputation as a "Swiss Army Knife" for Java developers. Overview of Hutool Features Hutool focuses on reducing the cost of learning APIs and increasing productivity by encapsulating underlying Java code into simple, functional methods. Key modules include: Date and Time : Advanced processing capabilities for formatting, parsing, and extracting time components. : Abstract classes for asymmetric encryption , wrapping complex logic like Private/Public key generation and Hex/Base64 encoding into accessible tools. : Standard implementations for timed and size-limited caches , allowing developers to easily implement pruning strategies. : Broad support for manipulation, Collection Networking : Built-in HTTP clients and database tools (JDBC) to handle external communications without heavy external dependencies. Version 3.9 Context As an early version, Hutool 3.9 preceded the major updates found in the current branch, which now supports newer Java environments like JDK 17+ and features more robust annotation synthesizers. Developers using modern stacks (e.g., Maven 3.9 and Spring Boot 3.4) typically rely on Hutool v5+ for better compatibility. code example for a Hutool module, or are you looking for migration tips to a newer version? AI responses may include mistakes. Learn more

In Hutool 3.9, the simplest way to perform a request is by using the HttpUtil.post method. This allows you to send data to a specified URL quickly. Direct POST (Form Data) 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? hutool Http 工具发送POST请求的几种方式。 - 稀土掘金

Note: 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. Hutool 3.9

Hutool 3.9 – Java Utility Library Report 1. Overview Hutool is a lightweight, well-structured Java utility library that reduces boilerplate code. Version 3.9 represents a mature release in the 3.x series, focusing on:

No external dependencies (except when using optional modules). JDK 8+ compatibility. Convenient wrappers for reflection, file I/O, HTTP, cryptography, date handling, etc.

2. Key Modules & Improvements in 3.9 2.1 convert – Type Conversion Hutool 3

Enhanced Convert class to handle Locale , TimeZone , Currency . Better array ↔ collection conversion.

2.2 date – Date & Time

DateUtil , DateTime , DateRange – chainable date arithmetic. Support for JDK 8 Time API ( LocalDateTime , ZonedDateTime ). Added DatePattern.NORM_* constants for common formats. Efficiency : Reducing the time developers spend writing

2.3 http – HTTP Client

HttpUtil – simple GET/POST with form data, file upload, timeout settings. Support for HTTPS without certificate validation (optionally).