diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..2087dd7
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,12 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = false
+insert_final_newline = true
diff --git a/pom.xml b/pom.xml
index 12d02a5..d7d1aad 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
   <groupId>xyz.zhouxy.plusone</groupId>
   <artifactId>plusone-validator</artifactId>
-  <version>0.1.3-SNAPSHOT</version>
+  <version>0.1.4-SNAPSHOT</version>
 
   <name>plusone-validator</name>
   <url>http://zhouxy.xyz</url>
@@ -28,6 +28,7 @@
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-lang3</artifactId>
       <version>${commons-lang3.version}</version>
+      <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.junit.jupiter</groupId>
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/BasePropertyValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/BasePropertyValidator.java
new file mode 100644
index 0000000..4913aa5
--- /dev/null
+++ b/src/main/java/xyz/zhouxy/plusone/validator/BasePropertyValidator.java
@@ -0,0 +1,171 @@
+package xyz.zhouxy.plusone.validator;
+
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Objects;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.util.function.Supplier;
+
+public abstract class BasePropertyValidator< //
+        TObj, //
+        TProperty, //
+        TPropertyValidator extends BasePropertyValidator<TObj, TProperty, TPropertyValidator>> {
+
+    private final Function<TObj, ? extends TProperty> getter;
+
+    private final List<Consumer<TProperty>> consumers = new LinkedList<>();
+
+    protected BasePropertyValidator(Function<TObj, ? extends TProperty> getter) {
+        this.getter = getter;
+    }
+
+    public final TPropertyValidator withRule(Predicate<? super TProperty> rule) {
+        return withRule(rule, v -> new IllegalArgumentException());
+    }
+
+    public final TPropertyValidator withRule(
+            Predicate<? super TProperty> rule, String errMsg) {
+        return withRule(rule, convertExceptionCreator(errMsg));
+    }
+
+    public final <E extends RuntimeException> TPropertyValidator withRule(
+            Predicate<? super TProperty> rule, Supplier<E> e) {
+        return withRule(rule, convertExceptionCreator(e));
+    }
+
+    public final <E extends RuntimeException> TPropertyValidator withRule(
+            Predicate<? super TProperty> rule, Function<TProperty, E> e) {
+        this.consumers.add(v -> {
+            if (!rule.test(v)) {
+                throw e.apply(v);
+            }
+        });
+        return thisObject();
+    }
+
+    public final <T extends TObj> void validate(T obj) {
+        for (Consumer<TProperty> consumer : consumers) {
+            consumer.accept(getter.apply(obj));
+        }
+    }
+
+    protected abstract TPropertyValidator thisObject();
+
+    // ====================
+    // ====== Object ======
+    // ====================
+
+    // ====== notNull =====
+
+    public TPropertyValidator notNull() {
+        return notNull("Value could not be null.");
+    }
+
+    public TPropertyValidator notNull(String errMsg) {
+        return notNull(convertExceptionCreator(errMsg));
+    }
+
+    public <E extends RuntimeException> TPropertyValidator notNull(Supplier<E> exceptionCreator) {
+        return notNull(convertExceptionCreator(exceptionCreator));
+    }
+
+    public <E extends RuntimeException> TPropertyValidator notNull(Function<TProperty, E> exceptionCreator) {
+        withRule(Objects::nonNull, exceptionCreator);
+        return thisObject();
+    }
+
+    // ====== isNull =====
+
+    public TPropertyValidator isNull(String errMsg) {
+        return isNull(convertExceptionCreator(errMsg));
+    }
+
+    public <E extends RuntimeException> TPropertyValidator isNull(Supplier<E> exceptionCreator) {
+        return isNull(convertExceptionCreator(exceptionCreator));
+    }
+
+    public <E extends RuntimeException> TPropertyValidator isNull(Function<TProperty, E> exceptionCreator) {
+        withRule(Objects::isNull, exceptionCreator);
+        return thisObject();
+    }
+
+    // ===== equals =====
+
+    public TPropertyValidator equalsThat(Object that) {
+        return equalsThat(that, value -> new IllegalArgumentException(String.format("(%s) 必须与 (%s) 相等", value, that)));
+    }
+
+    public TPropertyValidator equalsThat(Object that, String errMsg) {
+        return equalsThat(that, convertExceptionCreator(errMsg));
+    }
+
+    public <E extends RuntimeException> TPropertyValidator equalsThat(
+            Object that, Supplier<E> exceptionCreator) {
+        return equalsThat(that, convertExceptionCreator(exceptionCreator));
+    }
+
+    public <E extends RuntimeException> TPropertyValidator equalsThat(
+            Object that, Function<TProperty, E> exceptionCreator) {
+        withRule(value -> Objects.equals(value, that), exceptionCreator);
+        return thisObject();
+    }
+
+    // ===== isTrue =====
+
+    public TPropertyValidator isTrue(Predicate<TProperty> condition) {
+        return isTrue(condition, "无效的用户输入");
+    }
+
+    public TPropertyValidator isTrue(Predicate<TProperty> condition, String errMsg) {
+        return isTrue(condition, convertExceptionCreator(errMsg));
+    }
+
+    public <E extends RuntimeException> TPropertyValidator isTrue(
+            Predicate<TProperty> condition,
+            Supplier<E> exceptionCreator) {
+        return isTrue(condition, convertExceptionCreator(exceptionCreator));
+    }
+
+    public <E extends RuntimeException> TPropertyValidator isTrue(
+            Predicate<TProperty> condition,
+            Function<TProperty, E> exceptionCreator) {
+        withRule(condition, exceptionCreator);
+        return thisObject();
+    }
+
+    // ===== isTrue =====
+
+    public TPropertyValidator isTrue(Collection<Predicate<TProperty>> conditions) {
+        return isTrue(conditions, "无效的用户输入");
+    }
+
+    public TPropertyValidator isTrue(Collection<Predicate<TProperty>> conditions, String errMsg) {
+        return isTrue(conditions, convertExceptionCreator(errMsg));
+    }
+
+    public <E extends RuntimeException> TPropertyValidator isTrue(
+            Collection<Predicate<TProperty>> conditions,
+            Supplier<E> exceptionCreator) {
+        return isTrue(conditions, convertExceptionCreator(exceptionCreator));
+    }
+
+    public <E extends RuntimeException> TPropertyValidator isTrue(
+            Collection<Predicate<TProperty>> conditions,
+            Function<TProperty, E> exceptionCreator) {
+        for (Predicate<TProperty> condition : conditions) {
+            withRule(condition, exceptionCreator);
+        }
+        return thisObject();
+    }
+
+    static <V> Function<V, IllegalArgumentException> convertExceptionCreator(String errMsg) {
+        return value -> new IllegalArgumentException(errMsg);
+    }
+
+    static <V, E extends RuntimeException> Function<V, E> convertExceptionCreator(Supplier<E> exceptionSupplier) {
+        return value -> exceptionSupplier.get();
+    }
+}
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/BaseValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/BaseValidator.java
index 847a01d..655b9f4 100644
--- a/src/main/java/xyz/zhouxy/plusone/validator/BaseValidator.java
+++ b/src/main/java/xyz/zhouxy/plusone/validator/BaseValidator.java
@@ -10,18 +10,17 @@ import java.util.function.Supplier;
 
 public class BaseValidator<T> {
     private final List<Consumer<T>> rules = new ArrayList<>();
-    private final List<PropertyValidator<T, ?, ?>> propertyValidators = new ArrayList<>();
 
     protected void withRule(final Predicate<T> rule, final String errorMessage) {
-        withRule(rule, () -> InvalidInputException.of(errorMessage));
+        withRule(rule, () -> new IllegalArgumentException(errorMessage));
     }
 
     protected <E extends RuntimeException> void withRule(Predicate<T> rule, Supplier<E> exceptionBuilder) {
         withRule(rule, value -> exceptionBuilder.get());
     }
 
-    protected <E extends RuntimeException> void withRule(Predicate<T> condition,
-            Function<T, E> exceptionBuilder) {
+    protected <E extends RuntimeException> void withRule(
+            Predicate<T> condition, Function<T, E> exceptionBuilder) {
         withRule(value -> {
             if (!condition.test(value)) {
                 throw exceptionBuilder.apply(value);
@@ -34,47 +33,42 @@ public class BaseValidator<T> {
     }
 
     protected final <R> ObjectValidator<T, R> ruleFor(Function<T, R> getter) {
-        ObjectValidator<T, R> validValueHolder = new ObjectValidator<>(getter);
-        propertyValidators.add(validValueHolder);
-        return validValueHolder;
+        ObjectValidator<T, R> validator = new ObjectValidator<>(getter);
+        this.rules.add(validator::validate);
+        return validator;
     }
 
     protected final IntValidator<T> ruleForInt(Function<T, Integer> getter) {
-        IntValidator<T> validValueHolder = new IntValidator<>(getter);
-        propertyValidators.add(validValueHolder);
-        return validValueHolder;
+        IntValidator<T> validator = new IntValidator<>(getter);
+        this.rules.add(validator::validate);
+        return validator;
     }
 
     protected final DoubleValidator<T> ruleForDouble(Function<T, Double> getter) {
-        DoubleValidator<T> validValueHolder = new DoubleValidator<>(getter);
-        propertyValidators.add(validValueHolder);
-        return validValueHolder;
+        DoubleValidator<T> validator = new DoubleValidator<>(getter);
+        this.rules.add(validator::validate);
+        return validator;
     }
 
     protected final BoolValidator<T> ruleForBool(Function<T, Boolean> getter) {
-        BoolValidator<T> validValueHolder = new BoolValidator<>(getter);
-        propertyValidators.add(validValueHolder);
-        return validValueHolder;
+        BoolValidator<T> validator = new BoolValidator<>(getter);
+        this.rules.add(validator::validate);
+        return validator;
     }
 
     protected final StringValidator<T> ruleForString(Function<T, String> getter) {
-        StringValidator<T> validValueHolder = new StringValidator<>(getter);
-        propertyValidators.add(validValueHolder);
-        return validValueHolder;
+        StringValidator<T> validator = new StringValidator<>(getter);
+        this.rules.add(validator::validate);
+        return validator;
     }
 
     protected final <E> CollectionValidator<T, E> ruleForCollection(Function<T, Collection<E>> getter) {
-        CollectionValidator<T, E> validValueHolder = new CollectionValidator<>(getter);
-        propertyValidators.add(validValueHolder);
-        return validValueHolder;
+        CollectionValidator<T, E> validator = new CollectionValidator<>(getter);
+        this.rules.add(validator::validate);
+        return validator;
     }
 
     public void validate(T obj) {
-        for (Consumer<T> rule : this.rules) {
-            rule.accept(obj);
-        }
-        for (PropertyValidator<T, ?, ?> valueValidator : this.propertyValidators) {
-            valueValidator.validate(obj);
-        }
+        this.rules.forEach(rule -> rule.accept(obj));
     }
 }
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/BoolValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/BoolValidator.java
index fa408f6..726c164 100644
--- a/src/main/java/xyz/zhouxy/plusone/validator/BoolValidator.java
+++ b/src/main/java/xyz/zhouxy/plusone/validator/BoolValidator.java
@@ -3,9 +3,7 @@ package xyz.zhouxy.plusone.validator;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-import org.apache.commons.lang3.BooleanUtils;
-
-public class BoolValidator<DTO> extends PropertyValidator<DTO, Boolean, BoolValidator<DTO>> {
+public class BoolValidator<DTO> extends BasePropertyValidator<DTO, Boolean, BoolValidator<DTO>> {
 
     BoolValidator(Function<DTO, Boolean> getter) {
         super(getter);
@@ -27,7 +25,7 @@ public class BoolValidator<DTO> extends PropertyValidator<DTO, Boolean, BoolVali
 
     public <E extends RuntimeException> BoolValidator<DTO> isTrue(
             Function<Boolean, E> exceptionCreator) {
-        withRule(BooleanUtils::isTrue, exceptionCreator);
+        withRule(Boolean.TRUE::equals, exceptionCreator);
         return this;
     }
 
@@ -47,7 +45,7 @@ public class BoolValidator<DTO> extends PropertyValidator<DTO, Boolean, BoolVali
 
     public <E extends RuntimeException> BoolValidator<DTO> isFalse(
             Function<Boolean, E> exceptionCreator) {
-        withRule(BooleanUtils::isFalse, exceptionCreator);
+        withRule(Boolean.FALSE::equals, exceptionCreator);
         return this;
     }
 
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/CollectionValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/CollectionValidator.java
index cb434a1..afbd02e 100644
--- a/src/main/java/xyz/zhouxy/plusone/validator/CollectionValidator.java
+++ b/src/main/java/xyz/zhouxy/plusone/validator/CollectionValidator.java
@@ -4,7 +4,10 @@ import java.util.Collection;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-public class CollectionValidator<DTO, T> extends PropertyValidator<DTO, Collection<T>, CollectionValidator<DTO, T>> {
+import xyz.zhouxy.plusone.commons.collection.CollectionTools;
+
+public class CollectionValidator<DTO, T>
+        extends BasePropertyValidator<DTO, Collection<T>, CollectionValidator<DTO, T>> {
 
     CollectionValidator(Function<DTO, Collection<T>> getter) {
         super(getter);
@@ -22,7 +25,7 @@ public class CollectionValidator<DTO, T> extends PropertyValidator<DTO, Collecti
 
     public <E extends RuntimeException> CollectionValidator<DTO, T> notEmpty(
             Function<Collection<T>, E> exceptionCreator) {
-        withRule(value -> value != null && !value.isEmpty(), exceptionCreator);
+        withRule(CollectionTools::isNotEmpty, exceptionCreator);
         return this;
     }
 
@@ -38,7 +41,7 @@ public class CollectionValidator<DTO, T> extends PropertyValidator<DTO, Collecti
 
     public <E extends RuntimeException> CollectionValidator<DTO, T> isEmpty(
             Function<Collection<T>, E> exceptionCreator) {
-        withRule(value -> value == null || value.isEmpty(), exceptionCreator);
+        withRule(CollectionTools::isEmpty, exceptionCreator);
         return this;
     }
 
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/DoubleValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/DoubleValidator.java
index 4174e79..f2bbf4e 100644
--- a/src/main/java/xyz/zhouxy/plusone/validator/DoubleValidator.java
+++ b/src/main/java/xyz/zhouxy/plusone/validator/DoubleValidator.java
@@ -3,7 +3,7 @@ package xyz.zhouxy.plusone.validator;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-public class DoubleValidator<DTO> extends PropertyValidator<DTO, Double, DoubleValidator<DTO>> {
+public class DoubleValidator<DTO> extends BasePropertyValidator<DTO, Double, DoubleValidator<DTO>> {
 
     DoubleValidator(Function<DTO, Double> getter) {
         super(getter);
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/IntValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/IntValidator.java
index 1cdf093..1250f95 100644
--- a/src/main/java/xyz/zhouxy/plusone/validator/IntValidator.java
+++ b/src/main/java/xyz/zhouxy/plusone/validator/IntValidator.java
@@ -3,7 +3,7 @@ package xyz.zhouxy.plusone.validator;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-public class IntValidator<DTO> extends PropertyValidator<DTO, Integer, IntValidator<DTO>> {
+public class IntValidator<DTO> extends BasePropertyValidator<DTO, Integer, IntValidator<DTO>> {
 
     IntValidator(Function<DTO, Integer> getter) {
         super(getter);
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/InvalidInputException.java b/src/main/java/xyz/zhouxy/plusone/validator/InvalidInputException.java
deleted file mode 100644
index 1bc1c30..0000000
--- a/src/main/java/xyz/zhouxy/plusone/validator/InvalidInputException.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package xyz.zhouxy.plusone.validator;
-
-import xyz.zhouxy.plusone.commons.exception.BaseRuntimeException;
-
-/**
- * 4040000 - 用户请求参数错误
- *
- * @author <a href="https://gitee.com/zhouxy108">ZhouXY</a>
- */
-public class InvalidInputException extends BaseRuntimeException {
-
-    private static final long serialVersionUID = 7956661913360059670L;
-
-    public static final String ERROR_CODE = "4040000";
-
-    protected InvalidInputException(String code, String msg) {
-        super(code, msg);
-    }
-
-    protected InvalidInputException(String code, Throwable cause) {
-        super(code, cause);
-    }
-
-    protected InvalidInputException(String code, String msg, Throwable cause) {
-        super(code, msg, cause);
-    }
-
-    public static InvalidInputException of(String msg) {
-        return new InvalidInputException(ERROR_CODE, msg);
-    }
-
-    public static InvalidInputException of(Throwable cause) {
-        return new InvalidInputException(ERROR_CODE, cause);
-    }
-
-    public static InvalidInputException of(String msg, Throwable cause) {
-        return new InvalidInputException(ERROR_CODE, msg, cause);
-    }
-}
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/ObjectValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/ObjectValidator.java
index 6f2de5f..3941bc0 100644
--- a/src/main/java/xyz/zhouxy/plusone/validator/ObjectValidator.java
+++ b/src/main/java/xyz/zhouxy/plusone/validator/ObjectValidator.java
@@ -2,7 +2,7 @@ package xyz.zhouxy.plusone.validator;
 
 import java.util.function.Function;
 
-public class ObjectValidator<DTO, T> extends PropertyValidator<DTO, T, ObjectValidator<DTO, T>> {
+public class ObjectValidator<DTO, T> extends BasePropertyValidator<DTO, T, ObjectValidator<DTO, T>> {
 
     ObjectValidator(Function<DTO, T> getter) {
         super(getter);
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/PropertyValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/PropertyValidator.java
deleted file mode 100644
index 2dafff3..0000000
--- a/src/main/java/xyz/zhouxy/plusone/validator/PropertyValidator.java
+++ /dev/null
@@ -1,155 +0,0 @@
-package xyz.zhouxy.plusone.validator;
-
-import java.util.Collection;
-import java.util.Objects;
-import java.util.function.Consumer;
-import java.util.function.Function;
-import java.util.function.Predicate;
-import java.util.function.Supplier;
-
-abstract class PropertyValidator<DTO, PROPERTY, THIS> {
-    Function<DTO, PROPERTY> getter;
-    Validator<PROPERTY> validator = new Validator<>();
-
-    PropertyValidator(Function<DTO, PROPERTY> getter) {
-        this.getter = getter;
-    }
-
-    <E extends RuntimeException> void withRule(Predicate<PROPERTY> condition,
-            Function<PROPERTY, E> exceptionCreator) {
-        withRule(value -> {
-            if (!condition.test(value)) {
-                throw exceptionCreator.apply(value);
-            }
-        });
-    }
-
-    private void withRule(Consumer<PROPERTY> rule) {
-        this.validator.addRule(rule);
-    }
-
-    // ====================
-    // ====== Object ======
-    // ====================
-
-    // ====== notNull =====
-
-    public THIS notNull() {
-        return notNull("Value could not be null.");
-    }
-
-    public THIS notNull(String errMsg) {
-        return notNull(convertExceptionCreator(errMsg));
-    }
-
-    public <E extends RuntimeException> THIS notNull(Supplier<E> exceptionCreator) {
-        return notNull(convertExceptionCreator(exceptionCreator));
-    }
-
-    public <E extends RuntimeException> THIS notNull(Function<PROPERTY, E> exceptionCreator) {
-        withRule(Objects::nonNull, exceptionCreator);
-        return thisObject();
-    }
-
-    // ====== isNull =====
-
-    public THIS isNull(String errMsg) {
-        return isNull(convertExceptionCreator(errMsg));
-    }
-
-    public <E extends RuntimeException> THIS isNull(Supplier<E> exceptionCreator) {
-        return isNull(convertExceptionCreator(exceptionCreator));
-    }
-
-    public <E extends RuntimeException> THIS isNull(Function<PROPERTY, E> exceptionCreator) {
-        withRule(Objects::isNull, exceptionCreator);
-        return thisObject();
-    }
-
-    // ===== equals =====
-
-    public THIS equalsThat(Object that) {
-        return equalsThat(that, value -> InvalidInputException.of(String.format("(%s) 必须与 (%s) 相等", value, that)));
-    }
-
-    public THIS equalsThat(Object that, String errMsg) {
-        return equalsThat(that, convertExceptionCreator(errMsg));
-    }
-
-    public <E extends RuntimeException> THIS equalsThat(
-            Object that, Supplier<E> exceptionCreator) {
-        return equalsThat(that, convertExceptionCreator(exceptionCreator));
-    }
-
-    public <E extends RuntimeException> THIS equalsThat(
-            Object that, Function<PROPERTY, E> exceptionCreator) {
-        withRule(value -> Objects.equals(value, that), exceptionCreator);
-        return thisObject();
-    }
-
-    // ===== isTrue =====
-
-    public THIS isTrue(Predicate<PROPERTY> condition) {
-        return isTrue(condition, "无效的用户输入");
-    }
-
-    public THIS isTrue(Predicate<PROPERTY> condition, String errMsg) {
-        return isTrue(condition, convertExceptionCreator(errMsg));
-    }
-
-    public <E extends RuntimeException> THIS isTrue(
-            Predicate<PROPERTY> condition,
-            Supplier<E> exceptionCreator) {
-        return isTrue(condition, convertExceptionCreator(exceptionCreator));
-    }
-
-    public <E extends RuntimeException> THIS isTrue(
-            Predicate<PROPERTY> condition,
-            Function<PROPERTY, E> exceptionCreator) {
-        withRule(condition, exceptionCreator);
-        return thisObject();
-    }
-
-    // ===== isTrue =====
-
-    public THIS isTrue(Collection<Predicate<PROPERTY>> conditions) {
-        return isTrue(conditions, "无效的用户输入");
-    }
-
-    public THIS isTrue(Collection<Predicate<PROPERTY>> conditions, String errMsg) {
-        return isTrue(conditions, convertExceptionCreator(errMsg));
-    }
-
-    public <E extends RuntimeException> THIS isTrue(
-            Collection<Predicate<PROPERTY>> conditions,
-            Supplier<E> exceptionCreator) {
-        return isTrue(conditions, convertExceptionCreator(exceptionCreator));
-    }
-
-    public <E extends RuntimeException> THIS isTrue(
-            Collection<Predicate<PROPERTY>> conditions,
-            Function<PROPERTY, E> exceptionCreator) {
-        for (Predicate<PROPERTY> condition : conditions) {
-            withRule(condition, exceptionCreator);
-        }
-        return thisObject();
-    }
-
-    // ========================================================================
-
-    void validate(DTO obj) {
-        PROPERTY value = this.getter.apply(obj);
-        this.validator.validate(value);
-    }
-
-    static <V> Function<V, InvalidInputException> convertExceptionCreator(String errMsg) {
-        return value -> InvalidInputException.of(errMsg);
-    }
-
-    static <V, E extends RuntimeException> Function<V, E> convertExceptionCreator(
-            Supplier<E> exceptionSupplier) {
-        return value -> exceptionSupplier.get();
-    }
-    
-    protected abstract THIS thisObject();
-}
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/StringValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/StringValidator.java
index 77824e3..c102318 100644
--- a/src/main/java/xyz/zhouxy/plusone/validator/StringValidator.java
+++ b/src/main/java/xyz/zhouxy/plusone/validator/StringValidator.java
@@ -6,12 +6,12 @@ import java.util.function.Function;
 import java.util.function.Supplier;
 import java.util.regex.Pattern;
 
-import org.apache.commons.lang3.StringUtils;
+import com.google.common.base.Preconditions;
 
 import xyz.zhouxy.plusone.commons.constant.PatternConsts;
-import xyz.zhouxy.plusone.commons.util.RegexUtil;
+import xyz.zhouxy.plusone.commons.util.RegexTools;
 
-public class StringValidator<DTO> extends PropertyValidator<DTO, String, StringValidator<DTO>> {
+public class StringValidator<DTO> extends BasePropertyValidator<DTO, String, StringValidator<DTO>> {
 
     StringValidator(Function<DTO, String> getter) {
         super(getter);
@@ -36,7 +36,7 @@ public class StringValidator<DTO> extends PropertyValidator<DTO, String, StringV
     public <E extends RuntimeException> StringValidator<DTO> matches(
             Pattern regex,
             Function<String, E> exceptionCreator) {
-        withRule(input -> RegexUtil.matches(input, regex), exceptionCreator);
+        withRule(input -> RegexTools.matches(input, regex), exceptionCreator);
         return this;
     }
 
@@ -55,7 +55,7 @@ public class StringValidator<DTO> extends PropertyValidator<DTO, String, StringV
     public <E extends RuntimeException> StringValidator<DTO> matchesOne(
             Pattern[] regexs,
             Function<String, E> exceptionCreator) {
-        withRule(input -> RegexUtil.matchesOne(input, regexs), exceptionCreator);
+        withRule(input -> RegexTools.matchesOne(input, regexs), exceptionCreator);
         return this;
     }
 
@@ -72,7 +72,7 @@ public class StringValidator<DTO> extends PropertyValidator<DTO, String, StringV
     public <E extends RuntimeException> StringValidator<DTO> matchesOne(
             List<Pattern> regexs,
             Function<String, E> exceptionCreator) {
-        withRule(input -> RegexUtil.matchesOne(input, regexs.toArray(new Pattern[regexs.size()])), exceptionCreator);
+        withRule(input -> RegexTools.matchesOne(input, regexs.toArray(new Pattern[regexs.size()])), exceptionCreator);
         return this;
     }
 
@@ -91,7 +91,7 @@ public class StringValidator<DTO> extends PropertyValidator<DTO, String, StringV
     public <E extends RuntimeException> StringValidator<DTO> matchesAll(
             Pattern[] regexs,
             Function<String, E> exceptionCreator) {
-        withRule(input -> RegexUtil.matchesAll(input, regexs), exceptionCreator);
+        withRule(input -> RegexTools.matchesAll(input, regexs), exceptionCreator);
         return this;
     }
 
@@ -108,12 +108,24 @@ public class StringValidator<DTO> extends PropertyValidator<DTO, String, StringV
     public <E extends RuntimeException> StringValidator<DTO> matchesAll(
             Collection<Pattern> regexs,
             Function<String, E> exceptionCreator) {
-        withRule(input -> RegexUtil.matchesAll(input, regexs.toArray(new Pattern[regexs.size()])), exceptionCreator);
+        withRule(input -> RegexTools.matchesAll(input, regexs.toArray(new Pattern[regexs.size()])), exceptionCreator);
         return this;
     }
 
     // ===== notBlank =====
 
+    static boolean isNotBlank(final String cs) {
+        if (cs == null || cs.isEmpty()) {
+            return false;
+        }
+        for (int i = 0; i < cs.length(); i++) {
+            if (!Character.isWhitespace(cs.charAt(i))) {
+                return false;
+            }
+        }
+        return true;
+    }
+
     public StringValidator<DTO> notBlank() {
         return notBlank("This String argument must have text; it must not be null, empty, or blank");
     }
@@ -128,7 +140,7 @@ public class StringValidator<DTO> extends PropertyValidator<DTO, String, StringV
 
     public <E extends RuntimeException> StringValidator<DTO> notBlank(
             Function<String, E> exceptionCreator) {
-        withRule(StringUtils::isNotBlank, exceptionCreator);
+        withRule(StringValidator::isNotBlank, exceptionCreator);
         return this;
     }
 
@@ -162,23 +174,66 @@ public class StringValidator<DTO> extends PropertyValidator<DTO, String, StringV
 
     public <E extends RuntimeException> StringValidator<DTO> notEmpty(
             Function<String, E> exceptionCreator) {
-        withRule(StringUtils::isNotEmpty, exceptionCreator);
+        withRule(s -> s != null && !s.isEmpty(), exceptionCreator);
         return this;
     }
 
-    // ====== isEmpty =====
+    // ====== isNullOrEmpty =====
 
-    public StringValidator<DTO> isEmpty(String errMsg) {
-        return isEmpty(convertExceptionCreator(errMsg));
+    public StringValidator<DTO> isNullOrEmpty(String errMsg) {
+        return isNullOrEmpty(convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> StringValidator<DTO> isEmpty(Supplier<E> exceptionCreator) {
-        return isEmpty(convertExceptionCreator(exceptionCreator));
+    public <E extends RuntimeException> StringValidator<DTO> isNullOrEmpty(Supplier<E> exceptionCreator) {
+        return isNullOrEmpty(convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> StringValidator<DTO> isEmpty(
+    public <E extends RuntimeException> StringValidator<DTO> isNullOrEmpty(
             Function<String, E> exceptionCreator) {
-        withRule(StringUtils::isEmpty, exceptionCreator);
+        withRule(s -> s == null || s.isEmpty(), exceptionCreator);
+        return this;
+    }
+
+    // ====== length =====
+
+    public StringValidator<DTO> length(int length, String errMsg) {
+        return length(length, convertExceptionCreator(errMsg));
+    }
+
+    public <E extends RuntimeException> StringValidator<DTO> length(int length,
+            Supplier<E> exceptionCreator) {
+        return length(length, convertExceptionCreator(exceptionCreator));
+    }
+
+    public <E extends RuntimeException> StringValidator<DTO> length(int length,
+            Function<String, E> exceptionCreator) {
+        Preconditions.checkArgument(length >= 0, "The minimum value must be less than the maximum value.");
+        withRule(s -> s != null && s.length() == length, exceptionCreator);
+        return this;
+    }
+
+    static boolean length(String str, int min, int max) {
+        if (str == null) {
+            return false;
+        }
+        final int len = str.length();
+        return len >= min && len < max;
+    }
+
+    public StringValidator<DTO> length(int min, int max, String errMsg) {
+        return length(min, max, convertExceptionCreator(errMsg));
+    }
+
+    public <E extends RuntimeException> StringValidator<DTO> length(int min, int max,
+            Supplier<E> exceptionCreator) {
+        return length(min, max, convertExceptionCreator(exceptionCreator));
+    }
+
+    public <E extends RuntimeException> StringValidator<DTO> length(int min, int max,
+            Function<String, E> exceptionCreator) {
+        Preconditions.checkArgument(min >= 0, "The minimum value must be greater than equal to 0.");
+        Preconditions.checkArgument(min < max, "The minimum value must be less than the maximum value.");
+        withRule(s -> length(s, min, max), exceptionCreator);
         return this;
     }
 
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/map/EntryValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/map/EntryValidator.java
new file mode 100644
index 0000000..fd42bb0
--- /dev/null
+++ b/src/main/java/xyz/zhouxy/plusone/validator/map/EntryValidator.java
@@ -0,0 +1,22 @@
+package xyz.zhouxy.plusone.validator.map;
+
+import java.util.Map;
+
+import xyz.zhouxy.plusone.validator.BasePropertyValidator;
+
+public class EntryValidator<K, V>
+        extends BasePropertyValidator<Map<K, ? super V>, V, EntryValidator<K, V>> {
+
+    public EntryValidator(K key) {
+        super(m -> {
+            @SuppressWarnings("unchecked")
+            V v = (V) m.get(key);
+            return v;
+        });
+    }
+
+    @Override
+    protected EntryValidator<K, V> thisObject() {
+        return this;
+    }
+}
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/map/MapValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/map/MapValidator.java
new file mode 100644
index 0000000..e7432dc
--- /dev/null
+++ b/src/main/java/xyz/zhouxy/plusone/validator/map/MapValidator.java
@@ -0,0 +1,83 @@
+package xyz.zhouxy.plusone.validator.map;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
+
+public abstract class MapValidator<K, V> {
+
+    private final List<Consumer<Map<K, V>>> consumers = new LinkedList<>();
+
+    private final Set<K> keys;
+
+    protected MapValidator(K[] keys) {
+        this(Arrays.asList(keys));
+    }
+
+    protected MapValidator(Collection<K> keys) {
+        this.keys = keys.stream().collect(Collectors.toSet());
+    }
+
+    public final Map<K, V> validateAndCopy(Map<K, V> obj) {
+        return validateAndCopyInternal(obj, this.keys);
+    }
+
+    public final Map<K, V> validateAndCopy(Map<K, V> obj, Collection<K> keys) {
+        return validateAndCopyInternal(obj, keys);
+    }
+
+    @SafeVarargs
+    public final Map<K, V> validateAndCopy(Map<K, V> obj, K... keys) {
+        return validateAndCopyInternal(obj, Arrays.asList(keys));
+    }
+
+    private final Map<K, V> validateAndCopyInternal(Map<K, V> obj, Collection<K> keys) {
+        validate(obj);
+        return obj.entrySet().stream()
+                .filter(kv -> keys.contains(kv.getKey()))
+                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+    }
+
+    public final void validate(Map<K, V> obj) {
+        this.consumers.forEach(consumer -> consumer.accept(obj));
+    }
+
+    @SuppressWarnings("unused")
+    protected final <VV extends V> EntryValidator<K, VV> checkValue(K key, Class<VV> clazz) {
+        return checkValue(key);
+    }
+
+    protected final <VV extends V> EntryValidator<K, VV> checkValue(K key) {
+        EntryValidator<K, VV> validator = new EntryValidator<>(key);
+        this.consumers.add(validator::validate);
+        return validator;
+    }
+
+    protected final void withRule(Predicate<? super Map<K, V>> rule, String errMsg) {
+        withRule(rule, map -> new IllegalArgumentException(errMsg));
+    }
+
+    protected final void withRule(Predicate<? super Map<K, V>> rule, String errMsgFormat, Object... args) {
+        withRule(rule, map -> new IllegalArgumentException(String.format(errMsgFormat, args)));
+    }
+
+    protected final <E extends RuntimeException> void withRule(Predicate<? super Map<K, V>> rule, Supplier<E> e) {
+        withRule(rule, map -> e.get());
+    }
+
+    protected final <E extends RuntimeException> void withRule(Predicate<? super Map<K, V>> rule, Function<Map<K, V>, E> e) {
+        this.consumers.add(map -> {
+            if (!rule.test(map)) {
+                throw e.apply(map);
+            }
+        });
+    }
+}
diff --git a/src/test/java/xyz/zhouxy/plusone/validator/map/test/MapValidatorTests.java b/src/test/java/xyz/zhouxy/plusone/validator/map/test/MapValidatorTests.java
new file mode 100644
index 0000000..f8da6dc
--- /dev/null
+++ b/src/test/java/xyz/zhouxy/plusone/validator/map/test/MapValidatorTests.java
@@ -0,0 +1,86 @@
+package xyz.zhouxy.plusone.validator.map.test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.regex.Pattern;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.api.Test;
+
+import xyz.zhouxy.plusone.commons.collection.CollectionTools;
+import xyz.zhouxy.plusone.commons.constant.PatternConsts;
+import xyz.zhouxy.plusone.commons.function.PredicateTools;
+import xyz.zhouxy.plusone.commons.util.RegexTools;
+import xyz.zhouxy.plusone.validator.map.MapValidator;
+
+public //
+class MapValidatorTests {
+
+    private static final String USERNAME = "username";
+    private static final String ACCOUNT = "account";
+    private static final String PASSWORD = "password";
+    private static final String PASSWORD2 = "password2";
+    private static final String AGE = "age";
+    private static final String BOOLEAN = "boolean";
+    private static final String ROLE_LIST = "roleList";
+
+    private static final MapValidator<String, Object> validator = new MapValidator<String, Object>(
+            new String[] { USERNAME, ACCOUNT, PASSWORD, AGE, BOOLEAN, ROLE_LIST }) {
+        {
+
+            checkValue(USERNAME, String.class).withRule(
+                    PredicateTools.from(StringUtils::isNotBlank)
+                            .and(username -> RegexTools.matches(username, PatternConsts.USERNAME)),
+                    username -> new IllegalArgumentException(String.format("用户名【%s】不符合规范", username)));
+
+            checkValue(ACCOUNT, String.class).withRule(
+                    PredicateTools.from(StringUtils::isNotBlank)
+                            .and(account -> RegexTools.matchesOne(account,
+                                    new Pattern[] { PatternConsts.EMAIL, PatternConsts.MOBILE_PHONE })),
+                    "请输入正确的邮箱地址或手机号");
+
+            checkValue(PASSWORD, String.class)
+                    .withRule(StringUtils::isNotEmpty, "密码不能为空")
+                    .withRule(pwd -> RegexTools.matches(pwd, PatternConsts.PASSWORD), "密码不符合规范");
+
+            // 校验到多个属性，只能针对 map 本身进行校验
+            withRule(m -> Objects.equals(m.get(PASSWORD), m.get(PASSWORD2)),
+                    "两次输入的密码不一样！");
+
+            // 通过泛型方式调用方法，指定数据类型
+            this.<Integer>checkValue(AGE)
+                    .withRule(Objects::nonNull)
+                    .withRule(age -> (18 <= age && 60 >= age));
+
+            checkValue(BOOLEAN, Boolean.class)
+                    .withRule(Objects::nonNull, "Boolean property could not be null.")
+                    .withRule(b -> b, "Boolean property must be true.");
+
+            this.<Collection<String>>checkValue(ROLE_LIST)
+                    .withRule(CollectionTools::isNotEmpty, "角色列表不能为空！")
+                    .withRule(l -> l.stream().allMatch(StringUtils::isNotBlank),
+                            () -> new IllegalArgumentException("角色标识不能为空！"));
+
+        }
+    };
+
+    @Test
+    void testValidateAndCopy() {
+        Map<String, Object> params = new HashMap<>();
+        params.put("username", "ZhouXY");
+        params.put("account", "zhouxy@code108.cn");
+        params.put("password", "99Code108");
+        params.put("password2", "99Code108");
+        params.put("age", 18);
+        params.put("boolean", true);
+        params.put("roleList", Arrays.asList("admin", ""));
+
+        Map<String, Object> validedParams = validator.validateAndCopy(params);
+        System.out.println(validedParams);
+    }
+}
diff --git a/src/test/java/xyz/zhouxy/plusone/validator/test/BaseValidatorTest.java b/src/test/java/xyz/zhouxy/plusone/validator/test/BaseValidatorTest.java
index d6e2927..fc4f5a0 100644
--- a/src/test/java/xyz/zhouxy/plusone/validator/test/BaseValidatorTest.java
+++ b/src/test/java/xyz/zhouxy/plusone/validator/test/BaseValidatorTest.java
@@ -8,130 +8,136 @@ import org.apache.commons.lang3.StringUtils;
 import org.junit.jupiter.api.Test;
 
 import xyz.zhouxy.plusone.commons.constant.PatternConsts;
-import xyz.zhouxy.plusone.commons.function.Predicates;
-import xyz.zhouxy.plusone.commons.util.RegexUtil;
+import xyz.zhouxy.plusone.commons.function.PredicateTools;
+import xyz.zhouxy.plusone.commons.util.RegexTools;
 import xyz.zhouxy.plusone.validator.BaseValidator;
 import xyz.zhouxy.plusone.validator.ValidateUtil;
 
 class BaseValidatorTest {
     @Test
     void testValidate() {
-        RegisterCommand registerCommand = new RegisterCommand("zhouxy108", "luquanlion@outlook.com", "22336", "A1b2C3d4",
+        RegisterCommand registerCommand = new RegisterCommand("zhouxy108", "luquanlion@outlook.com", "22336",
+                "A1b2C3d4",
                 "A1b2C3d4",
                 Arrays.asList(new String[] { "admin", "editor" }));
         RegisterCommandValidator.INSTANCE.validate(registerCommand);
         ValidateUtil.validate(registerCommand, RegisterCommandValidator.INSTANCE);
         System.out.println(registerCommand);
     }
-}
 
-class RegisterCommandValidator extends BaseValidator<RegisterCommand> {
+    static class RegisterCommandValidator extends BaseValidator<RegisterCommand> {
 
-    static final RegisterCommandValidator INSTANCE = new RegisterCommandValidator();
+        static final RegisterCommandValidator INSTANCE = new RegisterCommandValidator();
 
-    private RegisterCommandValidator() {
-        ruleForString(RegisterCommand::getUsername)
-                .isTrue(Predicates.<String>of(Objects::nonNull)
-                        .and(StringUtils::isNotEmpty)
-                        .and(StringUtils::isNotBlank)
-                        .and(username -> RegexUtil.matches(username, PatternConsts.USERNAME)),
-                        username -> new IllegalArgumentException(String.format("用户名【%s】不符合规范", username)));
-        ruleForString(RegisterCommand::getAccount)
-                .notNull("请输入邮箱地址或手机号")
-                .matchesOne(Arrays.asList(PatternConsts.EMAIL, PatternConsts.MOBILE_PHONE), "请输入邮箱地址或手机号");
-        ruleForString(RegisterCommand::getCode)
-                .notNull("验证码不能为空")
-                .matches(PatternConsts.CAPTCHA, "验证码不符合规范");
-        ruleForString(RegisterCommand::getPassword)
-                .notEmpty("密码不能为空")
-                .matches(PatternConsts.PASSWORD, "密码不符合规范");
-        ruleForCollection(RegisterCommand::getRoles)
-                .notEmpty(() -> new RuntimeException("角色列表不能为空"));
+        private RegisterCommandValidator() {
+            ruleForString(RegisterCommand::getUsername)
+                    .isTrue(PredicateTools.<String>from(Objects::nonNull)
+                            .and(StringUtils::isNotEmpty)
+                            .and(StringUtils::isNotBlank)
+                            .and(username -> RegexTools.matches(username, PatternConsts.USERNAME)),
+                            username -> new IllegalArgumentException(String.format("用户名【%s】不符合规范", username)));
+            ruleForString(RegisterCommand::getAccount)
+                    .notNull("请输入邮箱地址或手机号")
+                    .matchesOne(Arrays.asList(PatternConsts.EMAIL, PatternConsts.MOBILE_PHONE), "请输入邮箱地址或手机号");
+            ruleForString(RegisterCommand::getCode)
+                    .notNull("验证码不能为空")
+                    .matches(PatternConsts.CAPTCHA, "验证码不符合规范");
+            ruleForString(RegisterCommand::getPassword)
+                    .notEmpty("密码不能为空")
+                    .matches(PatternConsts.PASSWORD, "密码不符合规范");
+            ruleForCollection(RegisterCommand::getRoles)
+                    .notEmpty(() -> new RuntimeException("角色列表不能为空"));
 
-        withRule(registerCommand -> Objects.equals(registerCommand.getPassword(), registerCommand.getPassword2()),
-                "两次输入的密码不一致");
-    }
-}
-
-/**
- * RegisterCommand
- */
-class RegisterCommand {
-
-    private String username;
-    private String account;
-    private String code;
-    private String password;
-    private String password2;
-    private List<String> roles;
-
-    public RegisterCommand() {
-    }
-
-    public RegisterCommand(String username, String account, String code, String password, String password2,
-            List<String> roles) {
-        this.username = username;
-        this.account = account;
-        this.code = code;
-        this.password = password;
-        this.password2 = password2;
-        this.roles = roles;
-    }
-
-    public String getUsername() {
-        return username;
-    }
-
-    public void setUsername(String username) {
-        this.username = username;
-    }
-
-    public String getAccount() {
-        return account;
-    }
-
-    public void setAccount(String account) {
-        this.account = account;
-    }
-
-    public String getCode() {
-        return code;
-    }
-
-    public void setCode(String code) {
-        this.code = code;
-    }
-
-    public String getPassword() {
-        return password;
-    }
-
-    public void setPassword(String password) {
-        this.password = password;
-    }
-
-    public String getPassword2() {
-        return password2;
-    }
-
-    public void setPassword2(String password2) {
-        this.password2 = password2;
-    }
-
-    public List<String> getRoles() {
-        return roles;
-    }
-
-    public void setRoles(List<String> roles) {
-        this.roles = roles;
-    }
-
-    @Override
-    public String toString() {
-        StringBuilder builder = new StringBuilder();
-        builder.append("RegisterCommand [username=").append(username).append(", account=").append(account)
-                .append(", code=").append(code).append(", password=").append(password).append(", password2=")
-                .append(password2).append(", roles=").append(roles).append("]");
-        return builder.toString();
+            withRule(registerCommand -> Objects.equals(registerCommand.getPassword(), registerCommand.getPassword2()),
+                    "两次输入的密码不一致");
+        }
+    }
+
+    /**
+     * RegisterCommand
+     */
+    static class RegisterCommand {
+
+        private String username;
+        private String account;
+        private String code;
+        private String password;
+        private String password2;
+        private List<String> roles;
+
+        public RegisterCommand() {
+        }
+
+        public RegisterCommand(String username, String account, String code, String password, String password2,
+                List<String> roles) {
+            this.username = username;
+            this.account = account;
+            this.code = code;
+            this.password = password;
+            this.password2 = password2;
+            this.roles = roles;
+        }
+
+        public String getUsername() {
+            return username;
+        }
+
+        public void setUsername(String username) {
+            this.username = username;
+        }
+
+        public String getAccount() {
+            return account;
+        }
+
+        public void setAccount(String account) {
+            this.account = account;
+        }
+
+        public String getCode() {
+            return code;
+        }
+
+        public void setCode(String code) {
+            this.code = code;
+        }
+
+        public String getPassword() {
+            return password;
+        }
+
+        public void setPassword(String password) {
+            this.password = password;
+        }
+
+        public String getPassword2() {
+            return password2;
+        }
+
+        public void setPassword2(String password2) {
+            this.password2 = password2;
+        }
+
+        public List<String> getRoles() {
+            return roles;
+        }
+
+        public void setRoles(List<String> roles) {
+            this.roles = roles;
+        }
+
+        @Override
+        public String toString() {
+            return new StringBuilder()
+                    .append("RegisterCommand [")
+                    .append("username=").append(username)
+                    .append(", account=").append(account)
+                    .append(", code=").append(code)
+                    .append(", password=").append(password)
+                    .append(", password2=").append(password2)
+                    .append(", roles=").append(roles)
+                    .append("]")
+                    .toString();
+        }
     }
 }
diff --git a/src/test/java/xyz/zhouxy/plusone/validator/test/ValidatorTests.java b/src/test/java/xyz/zhouxy/plusone/validator/test/ValidatorTests.java
new file mode 100644
index 0000000..b5cc7f4
--- /dev/null
+++ b/src/test/java/xyz/zhouxy/plusone/validator/test/ValidatorTests.java
@@ -0,0 +1,147 @@
+package xyz.zhouxy.plusone.validator.test;
+
+import static xyz.zhouxy.plusone.commons.constant.PatternConsts.*;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Objects;
+import java.util.regex.Pattern;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.api.Test;
+
+import com.google.common.base.Preconditions;
+
+import xyz.zhouxy.plusone.commons.collection.CollectionTools;
+import xyz.zhouxy.plusone.commons.function.PredicateTools;
+import xyz.zhouxy.plusone.commons.util.RegexTools;
+import xyz.zhouxy.plusone.validator.Validator;
+
+class ValidatorTests {
+    @Test
+    void testValidate() {
+        RegisterCommand registerCommand = new RegisterCommand(
+                "null", "luquanlion@outlook.com", "22336",
+                "A1b2C3d4", "A1b2C3d4",
+                Arrays.asList(new String[] { "admin", "editor" }));
+
+        Validator<RegisterCommand> registerCommandValidator = new Validator<RegisterCommand>()
+                // 传入 predicate 和 Function<T, E extends RuntimeException>
+                .addRule(command -> {
+                    String username = command.getUsername();
+                    return Objects.nonNull(username)
+                            && StringUtils.isNotEmpty(username)
+                            && StringUtils.isNotBlank(username)
+                            && RegexTools.matches(username, USERNAME);
+                }, command -> new IllegalArgumentException(String.format("用户名【%s】不符合规范", command.getUsername())))
+                // 传入 predicate 和 error message
+                .addRule(command -> PredicateTools
+                        .<String>from(Objects::nonNull)
+                        .and(account -> RegexTools.matchesOne(account, new Pattern[] { EMAIL, MOBILE_PHONE }))
+                        .test(command.getAccount()),
+                        "请输入邮箱地址或手机号")
+                // 传入 rule
+                .addRule(command -> {
+                    String code = command.getCode();
+                    Preconditions.checkArgument(Objects.nonNull(code), "验证码不能为空");
+                    Preconditions.checkArgument(RegexTools.matches(code, CAPTCHA), "验证码不符合规范");
+                })
+                // 传入 rule
+                .addRule(command -> {
+                    String password = command.getPassword();
+                    Preconditions.checkArgument(StringUtils.isNotEmpty(password), "密码不能为空");
+                    Preconditions.checkArgument(RegexTools.matches(password, PASSWORD), "密码不符合规范");
+                })
+                // 传入 predicate 和 Supplier<E extends RuntimeException>
+                .addRule(command -> CollectionTools.isNotEmpty(command.getRoles()),
+                        () -> new RuntimeException("角色列表不能为空"))
+                // 传入 predicate 和 error message
+                .addRule(command -> Objects.equals(command.getPassword(), command.getPassword2()),
+                        "两次输入的密码不一致");
+        registerCommandValidator.validate(registerCommand);
+        System.out.println(registerCommand);
+    }
+
+    /**
+     * RegisterCommand
+     */
+    static class RegisterCommand {
+
+        private String username;
+        private String account;
+        private String code;
+        private String password;
+        private String password2;
+        private List<String> roles;
+
+        public RegisterCommand() {
+        }
+
+        public RegisterCommand(String username, String account, String code, String password, String password2,
+                List<String> roles) {
+            this.username = username;
+            this.account = account;
+            this.code = code;
+            this.password = password;
+            this.password2 = password2;
+            this.roles = roles;
+        }
+
+        public String getUsername() {
+            return username;
+        }
+
+        public void setUsername(String username) {
+            this.username = username;
+        }
+
+        public String getAccount() {
+            return account;
+        }
+
+        public void setAccount(String account) {
+            this.account = account;
+        }
+
+        public String getCode() {
+            return code;
+        }
+
+        public void setCode(String code) {
+            this.code = code;
+        }
+
+        public String getPassword() {
+            return password;
+        }
+
+        public void setPassword(String password) {
+            this.password = password;
+        }
+
+        public String getPassword2() {
+            return password2;
+        }
+
+        public void setPassword2(String password2) {
+            this.password2 = password2;
+        }
+
+        public List<String> getRoles() {
+            return roles;
+        }
+
+        public void setRoles(List<String> roles) {
+            this.roles = roles;
+        }
+
+        @Override
+        public String toString() {
+            StringBuilder builder = new StringBuilder();
+            builder.append("RegisterCommand [username=").append(username).append(", account=").append(account)
+                    .append(", code=").append(code).append(", password=").append(password).append(", password2=")
+                    .append(password2).append(", roles=").append(roles).append("]");
+            return builder.toString();
+        }
+    }
+}
diff --git a/src/test/java/xyz/zhouxy/plusone/validator2/test/ValidatorTests.java b/src/test/java/xyz/zhouxy/plusone/validator2/test/ValidatorTests.java
deleted file mode 100644
index 372052d..0000000
--- a/src/test/java/xyz/zhouxy/plusone/validator2/test/ValidatorTests.java
+++ /dev/null
@@ -1,147 +0,0 @@
-package xyz.zhouxy.plusone.validator2.test;
-
-import static xyz.zhouxy.plusone.commons.constant.PatternConsts.*;
-
-import java.util.Arrays;
-import java.util.List;
-import java.util.Objects;
-import java.util.regex.Pattern;
-
-import org.apache.commons.lang3.StringUtils;
-import org.junit.jupiter.api.Test;
-
-import com.google.common.base.Preconditions;
-
-import xyz.zhouxy.plusone.commons.function.Predicates;
-import xyz.zhouxy.plusone.commons.util.MoreCollections;
-import xyz.zhouxy.plusone.commons.util.RegexUtil;
-import xyz.zhouxy.plusone.validator.Validator;
-
-class ValidatorTests {
-    @Test
-    void testValidate() {
-        RegisterCommand registerCommand = new RegisterCommand(
-                "null", "luquanlion@outlook.com", "22336",
-                "A1b2C3d4", "A1b2C3d4",
-                Arrays.asList(new String[] { "admin", "editor" }));
-
-        Validator<RegisterCommand> registerCommandValidator = new Validator<RegisterCommand>()
-                // 传入 predicate 和 Function<T, E extends RuntimeException>
-                .addRule(command -> {
-                    String username = command.getUsername();
-                    return Objects.nonNull(username)
-                            && StringUtils.isNotEmpty(username)
-                            && StringUtils.isNotBlank(username)
-                            && RegexUtil.matches(username, USERNAME);
-                }, command -> new IllegalArgumentException(String.format("用户名【%s】不符合规范", command.getUsername())))
-                // 传入 predicate 和 error message
-                .addRule(command -> Predicates
-                        .<String>of(Objects::nonNull)
-                        .and(account -> RegexUtil.matchesOne(account, new Pattern[] { EMAIL, MOBILE_PHONE }))
-                        .test(command.getAccount()),
-                        "请输入邮箱地址或手机号")
-                // 传入 rule
-                .addRule(command -> {
-                    String code = command.getCode();
-                    Preconditions.checkArgument(Objects.nonNull(code), "验证码不能为空");
-                    Preconditions.checkArgument(RegexUtil.matches(code, CAPTCHA), "验证码不符合规范");
-                })
-                // 传入 rule
-                .addRule(command -> {
-                    String password = command.getPassword();
-                    Preconditions.checkArgument(StringUtils.isNotEmpty(password), "密码不能为空");
-                    Preconditions.checkArgument(RegexUtil.matches(password, PASSWORD), "密码不符合规范");
-                })
-                // 传入 predicate 和 Supplier<E extends RuntimeException>
-                .addRule(command -> MoreCollections.isNotEmpty(command.getRoles()),
-                        () -> new RuntimeException("角色列表不能为空"))
-                // 传入 predicate 和 error message
-                .addRule(command -> Objects.equals(command.getPassword(), command.getPassword2()),
-                        "两次输入的密码不一致");
-        registerCommandValidator.validate(registerCommand);
-        System.out.println(registerCommand);
-    }
-}
-
-/**
- * RegisterCommand
- */
-class RegisterCommand {
-
-    private String username;
-    private String account;
-    private String code;
-    private String password;
-    private String password2;
-    private List<String> roles;
-
-    public RegisterCommand() {
-    }
-
-    public RegisterCommand(String username, String account, String code, String password, String password2,
-            List<String> roles) {
-        this.username = username;
-        this.account = account;
-        this.code = code;
-        this.password = password;
-        this.password2 = password2;
-        this.roles = roles;
-    }
-
-    public String getUsername() {
-        return username;
-    }
-
-    public void setUsername(String username) {
-        this.username = username;
-    }
-
-    public String getAccount() {
-        return account;
-    }
-
-    public void setAccount(String account) {
-        this.account = account;
-    }
-
-    public String getCode() {
-        return code;
-    }
-
-    public void setCode(String code) {
-        this.code = code;
-    }
-
-    public String getPassword() {
-        return password;
-    }
-
-    public void setPassword(String password) {
-        this.password = password;
-    }
-
-    public String getPassword2() {
-        return password2;
-    }
-
-    public void setPassword2(String password2) {
-        this.password2 = password2;
-    }
-
-    public List<String> getRoles() {
-        return roles;
-    }
-
-    public void setRoles(List<String> roles) {
-        this.roles = roles;
-    }
-
-    @Override
-    public String toString() {
-        StringBuilder builder = new StringBuilder();
-        builder.append("RegisterCommand [username=").append(username).append(", account=").append(account)
-                .append(", code=").append(code).append(", password=").append(password).append(", password2=")
-                .append(password2).append(", roles=").append(roles).append("]");
-        return builder.toString();
-    }
-}