The core mission of Hutool is to make Java development "sweet". It achieves this by:
import cn.hutool.core.convert.Convert; import cn.hutool.core.date.DateUtil; import cn.hutool.core.io.file.FileReader; import cn.hutool.core.io.file.FileWriter; import cn.hutool.core.util.StrUtil; import cn.hutool.crypto.SecureUtil; import cn.hutool.http.HttpUtil;
// String utilities example String template = "Hello {}, welcome to version {}!"; String result = StrUtil.format(template, "Developer", "3.9"); // Result: "Hello Developer, welcome to version 3.9!" boolean isEmpty = StrUtil.isBlank(result); // Safe null and whitespace checking // Collection handling List list = CollUtil.newArrayList("Apple", "Banana", "Orange"); String joined = CollUtil.join(list, ", "); // Result: "Apple, Banana, Orange" Use code with caution. 2. Painless Date Operations ( hutool-date ) Hutool 3.9
AES aes = SecureUtil.aes(); String encryptedHex = aes.encryptHex("Hello World"); String decryptedText = aes.decryptStr(encryptedHex); Use code with caution.
Based on the version number , you are referring to a specific point in the history of the Hutool Java utility library (which has since evolved into the 5.x and 6.x versions). Hutool is a widely used open-source Java toolkit in the Chinese software development community and beyond, designed to simplify common programming tasks. The core mission of Hutool is to make
: A highly intelligent type-conversion utility. It goes far beyond standard casting, allowing seamless conversion between strings, primitives, arrays, collections, and even custom Beans without throwing standard casting exceptions.
// 4. File I/O: Read and write files in one line FileWriter writer = new FileWriter("test.txt"); writer.write("Hello, Hutool!"); FileReader reader = new FileReader("test.txt"); String content = reader.readString(); System.out.println("File content: " + content); // Output: Hello, Hutool! Painless Date Operations ( hutool-date ) AES aes
The 3.9 release structure is defined by the cn.hutool.core root package, segmented into:
In the world of Java development, having the right tools at your disposal can make all the difference in productivity and efficiency. One such tool that has been gaining popularity among Java developers is Hutool, a comprehensive Java library that provides a wide range of utilities and functionalities to simplify development. In this article, we will take a closer look at Hutool 3.9, its features, and how it can benefit Java developers.
One of the most controversial yet productivity-enhancing features of Hutool is its handling of checked exceptions. Java mandates that methods like FileUtil.copy handle IOException . Hutool 3.9 wraps these checked exceptions into unchecked RuntimeException (specifically UtilException ) by default. This decision adheres to the philosophy that 90% of I/O errors are unrecoverable in the immediate scope, thus freeing the developer from mandatory try-catch blocks that clutter the codebase.
You can import the entire bundle or select only the specific components your project requires.
