chore: 添加 README

2025-06-01 06:01:06 +08:00 · 2025-06-01 06:01:06 +08:00 · 2ac8e39387
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+# Plusone Validator
+
+## 简介
+Plusone Validator 是一个校验库，使用 lambda 表达式（包括方法引用）和流式 API 构建校验规则，对对象进行校验。
+
+## 安装
+Plusone Validator 暂未提交 maven 中央仓库，可 clone 代码仓库，通过 maven 安装到本地库，然后在项目中引入。
+
+## 示例
+
+### 校验对象
+
+定义校验器：
+```java
+class CustomerValidator extends BaseValidator<Customer> {
+
+    private static final CustomerValidator INSTANCE = new CustomerValidator();
+
+    private CustomerValidator() {
+        ruleFor(Customer::getName).notBlank("姓名不能为空");
+        ruleFor(Customer::getEmailAddress).notBlank().emailAddress();
+        ruleFor(Customer::getVipLevel).notNull().inRange(Range.closed(0, 10), "会员等级必须在0-10之间");
+        ruleFor(Customer::getCustomerId).notBlank("客户编号不能为空");
+        ruleFor(Customer::getBirthday)
+            .notNull("生日不能为空")
+            .must(LocalDate.now().minusYears(16)::isAfter, "用户必须大于16周岁");
+        ruleFor(Customer::getAddress).length(20, 250, "地址长度必须在20-250之间");
+        ruleFor((Customer customer) -> Pair.of(customer.getVipLevel(), customer.getBirthday()))
+            .must(CustomerValidator::validateAge, "5级以上会员必须满18周岁");
+    }
+
+    private static boolean validateAge(Pair<Integer, LocalDate> vipLevelAndBirthday) {
+        Integer vipLevel = vipLevelAndBirthday.getLeft();
+        LocalDate birthday = vipLevelAndBirthday.getRight();
+        return vipLevel <= 5 || LocalDate.now().minusYears(18).isAfter(birthday);
+    }
+
+    public static CustomerValidator getInstance() {
+        return INSTANCE;
+    }
+}
+```
+
+使用：
+```java
+public void foo(Customer customer) {
+    CustomerValidator.getInstance().validate(customer);
+    // ...
+}
+```
+
+### 校验 Map
+
+定义校验器：
+```java
+class CustomerMapValidator extends MapValidator<String, Object> {
+
+    private static final CustomerMapValidator INSTANCE = new CustomerMapValidator();
+
+    private static final String[]  FIELD_NAMES = {
+        "name", "emailAddress", "vipLevel", "customerId", "birthday", "address"
+    };
+
+    private CustomerMapValidator() {
+        super(FIELD_NAMES);
+
+        ruleForString("name").notBlank("姓名不能为空");
+        ruleForString("emailAddress").notBlank().emailAddress();
+        ruleForInt("vipLevel").notNull().inRange(Range.closed(0, 10), "会员等级必须在0-10之间");
+        ruleForString("customerId").notBlank("客户编号不能为空");
+        this.<LocalDate>ruleFor("birthday")
+            .notNull("生日不能为空")
+            .must(LocalDate.now().minusYears(16)::isAfter, "用户必须大于16周岁");
+        ruleForString("address").length(20, 250, "地址长度必须在20-250之间");
+        this.<Pair<Integer, LocalDate>>ruleFor((Map<String, Object> customer) ->
+                Pair.of(MapUtils.getInteger(customer, "vipLevel"), (LocalDate) customer.get("birthday")))
+            .must(CustomerMapValidator::validateAge, "5级以上会员必须满18周岁");
+    }
+
+    private static boolean validateAge(Pair<Integer, LocalDate> vipLevelAndBirthday) {
+        Integer vipLevel = vipLevelAndBirthday.getLeft();
+        LocalDate birthday = vipLevelAndBirthday.getRight();
+        return vipLevel <= 5 || LocalDate.now().minusYears(18).isAfter(birthday);
+    }
+
+    public static CustomerMapValidator getInstance() {
+        return INSTANCE;
+    }
+}
+```
+
+使用：
+```java
+public void foo(Map<String, Object> customer) {
+    CustomerMapValidator.getInstance().validate(customer);
+    // ...
+}
+```
+---
+
+## 其他
+
+Plusone Validator 是个人在学习 Microsoft 的 [eShop](https://github.com/dotnet/eShop) 时，被其中 [FluentValidation](https://github.com/FluentValidation/FluentValidation) 的 API 所吸引，出于学习和个人使用的目的进行开发和维护。使用 Apache License 2.0 开源。
+
+欢迎通过 issue 反馈使用过程中发现的问题和建议。