Build a web service that reads Excel files, validates user input with null-safe string checks, and logs results to a database.
Create a REST API that encrypts sensitive data, generates CAPTCHA images for registration, and handles JSON requests without writing utility methods.
Develop a backend service that makes HTTP calls to external APIs, parses responses, formats dates for different locales, and manages JWT authentication tokens.
Write a file processing tool that reads Word documents, extracts text, transforms it, and writes results to disk using pre-built file I/O helpers.
Hutool is a Java utility library, a large collection of ready-made helper methods that solve common programming tasks so developers don't have to write the same boilerplate code over and over. The name blends the company name "Hu" with the English word "tool." The library covers an unusually wide range of everyday needs: working with strings, numbers, and dates; reading and writing files; making HTTP requests; handling JSON; encrypting and decrypting data; querying databases using JDBC (the standard Java database connection layer); generating image-based verification codes (captchas); reading Excel and Word files; working with JSON Web Tokens for user authentication; and more. Most of these are packaged as separate modules, so you can include only the parts you need rather than pulling in the whole library. The library targets Java 8 and above. A Java developer would turn to Hutool when they want to skip writing repetitive utility code, things like null-safe string checks, date formatting, or file reading, and instead call a single well-tested method. The documentation and code comments are primarily in Chinese, making it especially useful for developers working in that ecosystem. You can import the entire library at once or pick individual modules depending on your project's needs.
Generated 2026-05-18 · Model: sonnet-4-6 · Verify against the repo before relying on details.