添加元素扫描器与通用注解扫描器，在AnnotationScanner中统一提供已经配置好扫描模式的静态扫描器实例

hutool-core/src/test/java/cn/hutool/core/annotation/scanner/ElementAnnotationScannerTest.java

@@ -0,0 +1,60 @@
+package cn.hutool.core.annotation.scanner;
+
+import cn.hutool.core.collection.CollUtil;
+import cn.hutool.core.util.ReflectUtil;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class ElementAnnotationScannerTest {
+
+	@Test
+	public void supportTest() {
+		final ElementAnnotationScanner scanner = new ElementAnnotationScanner();
+		Assert.assertTrue(scanner.support(ReflectUtil.getField(FieldAnnotationScannerTest.Example.class, "id")));
+		Assert.assertTrue(scanner.support(ReflectUtil.getMethod(FieldAnnotationScannerTest.Example.class, "getId")));
+		Assert.assertFalse(scanner.support(null));
+		Assert.assertTrue(scanner.support(FieldAnnotationScannerTest.Example.class));
+	}
+
+	@Test
+	public void getAnnotationsTest() {
+		final ElementAnnotationScanner scanner = new ElementAnnotationScanner();
+		final Field field = ReflectUtil.getField(FieldAnnotationScannerTest.Example.class, "id");
+		Assert.assertNotNull(field);
+		Assert.assertTrue(scanner.support(field));
+		List<Annotation> annotations = scanner.getAnnotations(field);
+		Assert.assertEquals(1, annotations.size());
+		Assert.assertEquals(AnnotationForScannerTest.class, CollUtil.getFirst(annotations).annotationType());
+	}
+
+	@Test
+	public void scanTest() {
+		final ElementAnnotationScanner scanner = new ElementAnnotationScanner();
+		final Field field = ReflectUtil.getField(FieldAnnotationScannerTest.Example.class, "id");
+		final Map<Integer, List<Annotation>> map = new HashMap<>();
+		scanner.scan(
+			(index, annotation) -> map.computeIfAbsent(index, i -> new ArrayList<>()).add(annotation),
+			field, null
+		);
+		Assert.assertEquals(1, map.size());
+		Assert.assertEquals(1, map.get(0).size());
+		Assert.assertEquals(AnnotationForScannerTest.class, map.get(0).get(0).annotationType());
+	}
+
+	public static class Example {
+		@AnnotationForScannerTest
+		private Integer id;
+
+		public Integer getId() {
+			return id;
+		}
+	}
+
+}

hutool-core/src/test/java/cn/hutool/core/annotation/scanner/GenericAnnotationScannerTest.java

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+package cn.hutool.core.annotation.scanner;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.lang.annotation.*;
+import java.util.List;
+
+public class GenericAnnotationScannerTest {
+
+	@Test
+	public void scanDirectlyTest() {
+		final GenericAnnotationScanner scanner = new GenericAnnotationScanner(false, false, false);
+		final List<Annotation> annotations = scanner.getAnnotations(ClassForTest.class);
+		Assert.assertEquals(1, annotations.size());
+	}
+
+	@Test
+	public void scanDirectlyAndMetaAnnotationTest() {
+		final GenericAnnotationScanner scanner = new GenericAnnotationScanner(true, false, false);
+		final List<Annotation> annotations = scanner.getAnnotations(ClassForTest.class);
+		Assert.assertEquals(2, annotations.size());
+	}
+
+	@Test
+	public void scanSuperclassTest() {
+		final GenericAnnotationScanner scanner = new GenericAnnotationScanner(false, true, false);
+		final List<Annotation> annotations = scanner.getAnnotations(ClassForTest.class);
+		Assert.assertEquals(2, annotations.size());
+	}
+
+	@Test
+	public void scanSuperclassAndMetaAnnotationTest() {
+		final GenericAnnotationScanner scanner = new GenericAnnotationScanner(true, true, false);
+		final List<Annotation> annotations = scanner.getAnnotations(ClassForTest.class);
+		Assert.assertEquals(4, annotations.size());
+	}
+
+	@Test
+	public void scanInterfaceTest() {
+		final GenericAnnotationScanner scanner = new GenericAnnotationScanner(false, false, true);
+		final List<Annotation> annotations = scanner.getAnnotations(ClassForTest.class);
+		Assert.assertEquals(2, annotations.size());
+	}
+
+	@Test
+	public void scanInterfaceAndMetaAnnotationTest() {
+		final GenericAnnotationScanner scanner = new GenericAnnotationScanner(true, false, true);
+		final List<Annotation> annotations = scanner.getAnnotations(ClassForTest.class);
+		Assert.assertEquals(4, annotations.size());
+	}
+
+	@Test
+	public void scanTypeHierarchyTest() {
+		final GenericAnnotationScanner scanner = new GenericAnnotationScanner(false, true, true);
+		final List<Annotation> annotations = scanner.getAnnotations(ClassForTest.class);
+		Assert.assertEquals(3, annotations.size());
+	}
+
+	@Test
+	public void scanTypeHierarchyAndMetaAnnotationTest() {
+		final GenericAnnotationScanner scanner = new GenericAnnotationScanner(true, true, true);
+		final List<Annotation> annotations = scanner.getAnnotations(ClassForTest.class);
+		Assert.assertEquals(6, annotations.size());
+	}
+
+	@Target({ElementType.ANNOTATION_TYPE, ElementType.TYPE, ElementType.METHOD})
+	@Retention(RetentionPolicy.RUNTIME)
+	public @interface MetaAnnotationForTest { }
+
+	@MetaAnnotationForTest
+	@Target({ElementType.ANNOTATION_TYPE, ElementType.TYPE, ElementType.METHOD})
+	@Retention(RetentionPolicy.RUNTIME)
+	public @interface AnnotationForTest { }
+
+	@AnnotationForTest
+	static class ClassForTest extends SupperForTest implements InterfaceForTest { }
+
+	@AnnotationForTest
+	static class SupperForTest { }
+
+	@AnnotationForTest
+	interface InterfaceForTest { }
+
+}