39 - Hutool

Yes – no library is perfect.

Still, for internal tools, scripts, or rapid prototyping, Hutool 3.9 is a joy.

String ip = ServletUtil.getClientIP(request);

String json = "\"name\":\"hutool\"";
String result = HttpUtil.post("https://reqbin.com/echo/post/json", json);

If you’ve written Java for more than a week, you know the pain.
You need to copy a file? 15 lines of try-catch-finally.
You need to check if a string is empty? Two null checks and a trim.
You need to call a REST API? HttpURLConnection boilerplate that makes your eyes bleed. hutool 39

Enter Hutool.

While many Java developers reach for Guava or Apache Commons, Hutool (version 3.9 in particular) strikes a brilliant balance: Chinese simplicity with global utility. Yes – no library is perfect

Version note: Hutool 3.9.x is mature, stable, and still used in thousands of production systems. It lacks some 4.x/5.x features, but it’s lighter and less prone to breaking changes.

| Feature | Description | |---------|-------------| | CollUtil.isEmpty() | Now supports null safely | | DateUtil.range() | Generate date ranges (daily, monthly) | | SecureUtil.hmacSha1() | HMAC-SHA1 support | | CsvUtil | Read/write CSV files | | ImgUtil.pressText() | Image watermarking | | ZipUtil.zip() | Recursive directory zip | Still, for internal tools, scripts, or rapid prototyping,

Props props = new Props("config/db.properties");
String url = props.getStr("jdbc.url");

Hutool 3.9 is a "just works" utility library. It does not chase trends but solves real Java frustrations with concise, well-tested code. If you are maintaining a Java 8 codebase and need a Swiss army knife for common tasks, Hutool 3.9 delivers without bloat.

If you are looking for "Hutool 39," you are likely looking for the modern, active version of the library (specifically versions like 5.8.11+ which require JDK 1.8+). Hutool is a popular Java utility library that simplifies JDK standard operations.

Here is a comprehensive development guide for using modern Hutool (v5.8.x+).