Hutool 3.9

The philosophy behind Hutool is simple:

// Create a file (supports creating parent directories automatically) FileUtil.touch("/data/test.txt"); // Copy file FileUtil.copy(src, dest, true);

// Current Date Date date = DateUtil.date(); // String to Date (Automatic format detection) String dateStr = "2017-03-01 12:30:45"; Date parsedDate = DateUtil.parse(dateStr); Hutool 3.9

in version 3.9 provided a Unix-like command structure for file manipulation:

Today, Hutool stands as one of the most popular utility libraries in the Java world. While the library has evolved significantly over the years, looking back at versions like offers a fascinating glimpse into the maturation of a tool designed to make Java "sweeter" (Hu + Tool = Hutool, referencing the Chinese word for gourd, which sounds like "Hu"). The philosophy behind Hutool is simple: // Create

This API design reduces a 20-line native Java implementation into a single line. Making a GET or POST request in native Java involves setting up HttpURLConnection , handling timeouts, managing input streams, and parsing responses.

Hutool 3.9 introduced a fluid way to handle dates: Making a GET or POST request in native

For developers who found Apache HttpClient too heavy

In the 3.9 iteration, the parsing engine was specifically optimized to handle Chinese date characters and standard ISO formats simultaneously, a feature that saved countless hours for developers working on internationalization. Java's native InputStream and OutputStream handling requires verbose try-catch blocks and manual closing of streams. Hutool’s IoUtil and FileUtil automate this.

// List files with extension filter List<File> files = FileUtil.loopFiles(path, 2, file -> file.getName().endsWith(".xml"));