hutool-patterns
Hutool 中文 Java 工具库技能。覆盖与 Guava/Apache Commons 的功能选择矩阵、字符串/集合/日期/文件/HTTP 最常用方法速查、HttpUtil vs OkHttp 选型、BeanUtil vs MapStruct 职责划分。 当用户在 Java 项目中需要中文场景的工具方法(拼音/身份证/手机号校验)、HTTP请求、文件操作、加解密时使用。避免 LLM 自造轮子而不用 Hutool。
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/full-stack-skills/java-skills --skill hutool-patterns- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads hutool-patterns automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Hutool Java 工具库
来源：https://doc.hutool.cn/
GitHub：https://github.com/chinabugotech/hutool
Capability Boundaries
✅ Strong Suits
- StrUtil — format/空判断/截断/下划线驼峰互转、subBetween 截取中间文本
- CollUtil — isEmpty/intersection/union/subtract/groupBy 集合操作
- DateUtil — 日期格式化/解析(自动识别多格式)/偏移/时间差/计时器
- HttpUtil — HTTP GET/POST/文件上传(简化 OkHttp/Apache HttpClient)
- JSONUtil — 轻量 JSON 序列化(非高吞吐场景)
- SecureUtil — MD5/SHA/AES/RSA/Base64 简化版
- IdcardUtil — 身份证校验(支持15/18位)、提取生日/性别/年龄/省份
- Validator — 手机号/邮箱/IP/身份证/URL 校验
- DesensitizedUtil — 数据脱敏(手机号/身份证/银行卡/地址)
- ReUtil — 正则匹配/提取/替换简化
❌ Out of Scope
- 高性能 JSON → 用 Jackson/Fastjson2(Spring Boot 默认)
- HTTP 高并发 → 用 OkHttp 连接池
- Bean 映射 → 用 MapStruct 编译期生成
- 分布式锁 → 用 Redisson
工具选择矩阵
| 场景 | Hutool | Guava | Apache Commons | Java 标准库 |
|---|---|---|---|---|
| 字符串处理 | ⭐⭐ | ⭐⭐ | ⭐⭐⭐ | ⭐ |
| 日期处理 | ⭐⭐⭐ | — | ⭐ | ⭐⭐ |
| HTTP客户端 | ⭐⭐⭐(简单) | — | ⭐⭐ | ⭐⭐ |
| 身份证/手机号 | ⭐⭐⭐ | — | ⭐⭐ | — |
| 加解密 | ⭐⭐ | — | ⭐ | — |
| 文件操作 | ⭐⭐⭐ | ⭐ | ⭐⭐⭐ | ⭐⭐ |
| JSON | ⭐⭐ | — | — | — |
| 集合操作 | ⭐⭐ | ⭐⭐⭐ | ⭐⭐ | ⭐⭐ |
LLM最常犯的错误
| # | 错误 | 正确做法 |
|---|---|---|
| 1 | 手写身份证校验正则 30 行 | IdcardUtil.isValidCard("440101...") — 含校验位算法 |
| 2 | String.format() 用 %s 难读 | StrUtil.format("Hello {}", name) 命名占位更可读 |
| 3 | 手写日期格式转换/计算 | DateUtil.parse(dateStr).offset(DateField.DAY_OF_MONTH, 7) |
| 4 | Apache HttpClient 50行代码发GET | HttpUtil.get(url) 一行搞定 |
| 5 | isEmpty 判断空白字符串误判 | 用 StrUtil.isBlank() 替代 isEmpty() — 含空白判断 |
| 6 | 高并发场景也用 HttpUtil | 高并发用 OkHttp 连接池，HttpUtil 仅简单场景 |
| 7 | BeanUtil.copyProperties 替代 MapStruct | BeanUtil 是反射（运行时慢），MapStruct 是编译期生成（快） |
| 8 | JSONUtil 替代 Jackson | JSONUtil 仅轻量场景，生产 API 用 Jackson |
| 9 | StrUtil.isEmpty(" ") 返回 false | StrUtil.isBlank(" ") 返回 true |
| 10 | SimpleDateFormat 线程不安全 | DateUtil.parse() 线程安全，底层 ThreadLocal |
核心规则速查
// ✅ 字符串—isBlank 优于 isEmpty
StrUtil.isBlank(null); // true ✅
StrUtil.isBlank(""); // true
StrUtil.isBlank(" "); // true ← isEmpty 认为 false
StrUtil.isEmpty(" "); // false ❌
// ✅ 字符串—命名占位比 %s 可读
StrUtil.format("Hello {}, 欢迎来到{}!", "张三", "上海");
StrUtil.format("你好, {name}, 欢迎来到{city}!",
MapUtil.of("name", "张三", "city", "上海"));
// ✅ 字符串—截取中间文本
String content = StrUtil.subBetween("prefix_content_suffix", "prefix_", "_suffix"); // "content"
StrUtil.removePrefix("prefix_content", "prefix_"); // "content"
StrUtil.removeSuffix("content_suffix", "_suffix"); // "content"
// ✅ 字符串—分割（自动 trim、忽略空值）
List<String> parts = StrUtil.split("a,b, c ,d", ',', 0, true, true);
// => ["a", "b", "c", "d"]
// ✅ 日期—自动识别多种格式
DateUtil.parse("2025-08-04"); // yyyy-MM-dd
DateUtil.parse("2025/08/04 10:30:00"); // yyyy/MM/dd HH:mm:ss
DateUtil.parse("2025年08月04日"); // 中文日期
// ✅ 日期—计算与比较
DateUtil.offsetDay(new Date(), 7); // 7天后
DateUtil.between(begin, end, DateUnit.DAY); // 间隔天数
DateUtil.beginOfMonth(new Date()); // 月初
DateUtil.endOfMonth(new Date()); // 月末
// ✅ HTTP—简单请求一行搞定
String result = HttpUtil.get("https://api.example.com/data");
HttpUtil.post(url, params); // application/x-www-form-urlencoded
HttpUtil.post(url, jsonBody); // JSON POST
// ✅ HTTP—链式调用(自定义Header/超时)
String result = HttpUtil.createPost(url)
.header("Authorization", "Bearer xxx")
.header("Content-Type", "application/json")
.timeout(5000) // 5秒超时
.body(jsonBody)
.execute()
.body();
// ✅ 身份证—全套处理
IdcardUtil.isValidCard("440101199001011234"); // 校验含校验位
int age = IdcardUtil.getAgeByIdCard(idCard); // 提取年龄
String gender = IdcardUtil.getGenderByIdCard(idCard); // 1=男, 0=女
String birth = IdcardUtil.getBirthByIdCard(idCard); // 19900101
String province = IdcardUtil.getProvinceByIdCard(idCard); // 广东
// ✅ 数据脱敏
DesensitizedUtil.idCardNum(idCard, 1, 2); // 440***********1234
DesensitizedUtil.mobilePhone("13800138000"); // 138****8000
DesensitizedUtil.email("test@example.com"); // t***@example.com
// ✅ 校验
Validator.isMobile("13800138000");
Validator.isEmail("test@example.com");
Validator.isCitizenId("440101199001011234"); // 轻量版身份证校验
// ✅ 集合
CollUtil.isEmpty(list); // 安全的判空(null或空集)
List<String> union = CollUtil.union(list1, list2); // 并集
List<String> inter = CollUtil.intersection(list1, list2); // 交集
Map<String, List<User>> grouped = CollUtil.groupBy(users, User::getStatus); // 分组
核心模式
模式 1: 身份证校验三段式
// 1. 快速格式校验 → 2. 完整校验位验证 → 3. 提取信息
if (Validator.isCitizenId(idCard)) { // 轻量正则
if (IdcardUtil.isValidCard(idCard)) { // 完整校验(含校验位)
int age = IdcardUtil.getAgeByIdCard(idCard);
String gender = IdcardUtil.getGenderByIdCard(idCard);
}
}
模式 2: 缓存空值防护
// 查询外部 API 时缓存空值，防止穿透
public String queryWeather(String city) {
return cache.get(city, key -> {
String result = HttpUtil.get("https://api.weather.com/" + city);
if (StrUtil.isBlank(result)) {
return "NULL_CACHE"; // 空值标记，缓存5分钟
}
return result;
});
}
模式 3: 多条件字符串处理链
String clean = StrUtil.trim(input); // 去首尾空白
String named = StrUtil.toCamelCase(clean); // 转驼峰
List<String> parts = StrUtil.split(named, ','); // 按逗号分割
Gotchas
- isBlank vs isEmpty — isEmpty 不识别空白字符串(空格/tab/换行)
- HttpUtil 默认无连接池 — 高并发场景用 OkHttp，HttpUtil 适合简单场景
- JSONUtil 日期格式默认 yyyy-MM-dd HH:mm:ss — 与 Jackson 不同
- BeanUtil.copyProperties 是浅拷贝 — 嵌套对象不拷贝(引用共享)
- SecureUtil.sha256() 返回 hex 字符串 — 不是 byte[]
- DateUtil.parse() 自动识别格式有时误判 — 明确格式用 parse(dateStr, "yyyy-MM-dd")
- IdcardUtil 仅支持中国大陆18/15位身份证 — 港澳台/外籍不支持
- Hutool 功能太多(500+类) — 不要全部引入，按需使用子模块
- DateUtil.parse() 线程安全 — 底层 ThreadLocal 持有 SimpleDateFormat
- CollUtil.groupBy() 按字段分组 — 替代手写 Map 循环
Data Privacy
本技能不收集、存储或传输任何用户数据。
FAQ
What does the hutool-patterns skill do?
Hutool 中文 Java 工具库技能。覆盖与 Guava/Apache Commons 的功能选择矩阵、字符串/集合/日期/文件/HTTP 最常用方法速查、HttpUtil vs OkHttp 选型、BeanUtil vs MapStruct 职责划分。 当用户在 Java 项目中需要中文场景的工具方法(拼音/身份证/手机号校验)、HTTP请求、文件操作、加解密时使用。避免 LLM 自造轮子而不用 Hutool。
How do I install hutool-patterns?
Run npx skills add https://github.com/full-stack-skills/java-skills --skill hutool-patterns in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/hutool-patterns/ (personal) or .claude/skills/hutool-patterns/ (project).
Which AI agents can use hutool-patterns?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is hutool-patterns safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains hutool-patterns?
It is published by full-stack-skills in full-stack-skills/java-skills. It has 86 recorded installs.
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