Hutool 3.9 Upd __top__ -

| Feature | Java 17 JDK | Hutool 3.9 UPD | | :--- | :--- | :--- | | | Requires JavaMail + manual MIME | MailUtil.send() one-liner | | Captcha generation | Zero support | CaptchaUtil.createLineCaptcha() | | Tree structure building | Manual recursion | TreeUtil.build(list, "0") | | Parameter validation | Hibernate or manual | Validator.isChinese(name) |

// Before 3.9 – manual JSONObject creation JSONObject json = new JSONObject(); json.put("name", user.getName()); Hutool 3.9 UPD

A lightweight HTTP client that simplifies web requests. | Feature | Java 17 JDK | Hutool 3