Hutool 39 New Hot! -

Older versions of Hutool would write temporary files to disk for large zip operations. introduced ZipUtil.zip(File zipFile, boolean withTempFile, File... sources) . By setting withTempFile to false , the library now zips entirely in memory using ByteArrayOutputStream , which is a game-changer for serverless functions (AWS Lambda) where writing to /tmp is expensive.

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

Taking Java's functional capabilities to the next level with custom monads and stream enhancements. Zero-Config HTTP/3 Support: you know and love, now upgraded for modern web speeds. Virtual Threads Optimization: hutool 39 new

Given that we are now in the era of Java 21, is learning "hutool 39 new" a waste of time?

import cn.hutool.core.lang.Assert; import cn.hutool.core.util.DesensitizedUtil; import java.util.Collections; import java.util.List; public class CoreUtilityDemo public static void main(String[] args) // 1. Passport Privacy Desensitization (New in 5.8.39) String rawPassport = "G12345678"; String maskedPassport = DesensitizedUtil.passport(rawPassport); System.out.println("Protected: " + maskedPassport); // Prints protected formatting // 2. Clear Collection Verification Assertions List emptyReportQueue = Collections.emptyList(); Assert.isEmpty(emptyReportQueue, "Process aborted: The payload tracking queue must be empty!"); Use code with caution. Example B: Configuring Global DB Streaming Properties

// Hutool 39: Cleaner var result = JsonUtil.parseObj(jsonStr).getBean("data", new TypeReference<List<Order>>() {}); Older versions of Hutool would write temporary files

：修复了 ZipUtil 在调用 zlib 和 unZlib 后未正确释放资源的问题，避免资源泄漏。

: Alex noticed the application felt snappier. The update had optimized XXXToMapCopier and added a RecyclableBatchThreadPoolExecutor , which managed system resources far more efficiently than their old manual setups. The Result: Elegant Java

Symmetric, asymmetric, and digest encryption utilities. By setting withTempFile to false , the library

Proper RFC-compliant escaping + file appending.

#Java #OpenSource #Hutool

The DateUtil in this version was a favorite among users for its ability to parse almost any date string format automatically and perform complex date arithmetic (e.g., DateUtil.offsetMonth ) in a single line.