Hutool 3.9 (2024)

is widely celebrated by Java developers as the "Swiss Army Knife" that makes the language "sweet". By encapsulating complex code into simple, static methods, it spares developers from the endless cycle of searching, copying, and pasting boilerplate code from forums.

The team fell in love with Dict—Hutool 3.9’s dynamic map for JSON-ish data without pulling in Jackson. Hutool 3.9

Avoiding "Copy-Paste": Replaces the need for custom "Util" packages that often lead to bugs due to imperfect encapsulation. is widely celebrated by Java developers as the

Example code changes

• Import update: Before:

  import com.xiaoleilu.hutool.util.StrUtil;
  

  After:

  import cn.hutool.core.util.StrUtil;
  

• JSON parsing (adjust casting if needed): Before:

  JSONObject obj = JSONUtil.parseObj(jsonString);
  

  After (if return type changed):

  JSONObject obj = JSONUtil.parseObj(jsonString); // verify return type in 3.9 docs
  

If you read the developer logs and contribution rules from that era, the founder openly admitted to having an extreme "obsessive-compulsive" drive for clean code. Pull requests were fiercely scrutinized for strict tab indentations and perfect JavaDoc documentation. This rigid discipline in the 3.x branch is precisely why the library gained a reputation for being remarkably bug-free. How Hutool compares to other Java Utils Feature Philosophy Hutool (e.g., 3.9 / 5.x) Apache Commons Guava (Google) Primary Goal Minimize lines of code / Make Java "sweet" Provide heavy-duty low-level components Power Google's massive infrastructure Learning Curve Extremely low (Highly semantic static methods) Moderate to high Design Style All-in-one "Swiss Army Knife" Split into dozens of specialized libraries Opinionated, functional, and strict Dependency Pure Java (Zero external dependencies in core) High (Often brings in other Google libraries) Are you looking to use Hutool in a modern project , or are you maintaining a legacy application that still relies on a 3.x version? hutool/README-EN.md at v5-master - GitHub Import update: Before: import com

Find a blog, copy the code, and modify it to fit their project.

Zero Dependencies: The core library doesn't drag in a mess of other JAR files.

3.1 Advanced HTTP Client (HttpUtil)

Prior to 3.9, Java developers relied heavily on Apache HttpClient or the verbose native HttpURLConnection. Hutool 3.9 refined its internal HTTP implementation, allowing for fluent chain calls without external dependencies.

• Utilities: Hutool provides a wide range of utility classes for tasks such as string manipulation, date and time processing, and file I/O operations.
• Cryptography: The library includes a variety of cryptographic tools, including encryption, decryption, and hashing functions.
• JSON and XML Processing: Hutool offers robust support for JSON and XML data formats, making it easy to work with these popular data formats.
• Validation and Verification: The library provides tools for data validation and verification, helping developers ensure the integrity and accuracy of their data.