Hutool 39 New (2027)

import cn.hutool.core.io.file.FileReader;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JsonUtil;
import cn.hutool.crypto.symmetric.AesGcm;
public class Demo 
public static void main(String[] args) 
// Immutable date
var now = DateUtil.date();
var tomorrow = now.offsetNew(DateField.DAY_OF_MONTH, 1);
    // New JSON API
    var json = Json.createObject().set("key", "value");
// AES-GCM encryption
    var aes = new AesGcm("1234567890123456".getBytes());
    var encrypted = aes.encrypt("Secret".getBytes());
// String utilities
    boolean isBlank = StrUtil.isBlank("  ");
    System.out.println(isBlank); // true

Hutool provides a migration guide with an automated script (in /bin/migrate-to-6.sh).

The universal conversion class (String to Date, Number to Boolean) was refactored in 3.9 to cache conversion logic. If you convert a String "123" to Integer twice, the second conversion bypasses the parsing algorithm and uses a cached result. In high-throughput log processing, this reduced GC pressure by roughly 15%. hutool 39 new

DateUtil.parse() now handles nanoseconds and UTC offsets like 2025-03-15T14:30:45.123456789+05:30.

Let’s look at three "pain points" that hutool 3.9 new features solve immediately. import cn

To understand the value of Hutool, one must first acknowledge the verbosity of pure Java. A simple task, such as reading a file into a string, requires streams, buffers, try-catch blocks, and explicit resource closing. While Java 7’s try-with-resources improved this, and Java 8’s Streams API revolutionized data manipulation, the language still retains a reputation for being stiff and ceremonial.

This is where Hutool steps in. It is not a framework that dictates architecture like Spring; rather, it is a utilitarian layer that smooths over the jagged edges of the JDK. Version 5.8.39 encapsulates this ethos perfectly. It provides a suite of static method wrappers ( XxxUtil) that turn complex operations into one-liners. Hutool provides a migration guide with an automated

If you’re a Java developer, you’ve almost certainly run into the same pain points: tedious date conversions, clunky file I/O, reflection headaches, and the dreaded if (collection == null || collection.isEmpty()). Hutool has been quietly solving these problems for years.

With version 0.39, the library takes another leap forward. Let’s dive into what’s new, what’s improved, and why you should update today.