Hutool 39 Info

---

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+).

---

10. FileUtil.touch("path/to/file.txt") Creates a file and all non-existent parent directories. Like Unix touch. hutool 39

11. FileUtil.readUtf8String(file) Reads an entire file into a single string. Perfect for small config files.

12. FileUtil.writeLines(collection, "output.txt", "UTF-8") Writes a collection of strings to a file, one per line. If you are looking for "Hutool 39," you

13. FileUtil.loopFiles("dir") Recursively list all files in a directory (excluding directories themselves).

14. FileUtil.getMimeType("file.jpg") → "image/jpeg" No need to guess content types manually. // SHA-1 String sha1 = SecureUtil.sha1("test")

// MD5
String md5 = SecureUtil.md5("test");
// SHA-1
String sha1 = SecureUtil.sha1("test");
// AES
String key = "1234567890123456";
Aes aes = SecureUtil.aes(key.getBytes());
String encrypted = aes.encryptHex("secret");
String decrypted = aes.decryptStr(encrypted);