修复ObjectUtil.contains处理字符串类型不合理

hutool-core/src/main/java/cn/hutool/core/util/ObjectUtil.java

@@ -128,7 +128,7 @@ public class ObjectUtil {
 	 * 对象中是否包含元素<br>
 	 * 支持的对象类型包括：
 	 * <ul>
-	 * <li>String</li>
+	 * <li>CharSequence</li>
 	 * <li>Collection</li>
 	 * <li>Map</li>
 	 * <li>Iterator</li>
@@ -144,11 +144,22 @@ public class ObjectUtil {
 		if (obj == null) {
 			return false;
 		}
-		if (obj instanceof String) {
+		if (obj instanceof CharSequence) {
-			if (element == null) {
+			if (!(element instanceof CharSequence)) {
 				return false;
 			}
-			return ((String) obj).contains(element.toString());
+			String elementStr;
+			try {
+				elementStr = element.toString();
+				// 检查 toString() 返回 null 的情况
+				if (elementStr == null) {
+					return false;
+				}
+			} catch (Exception e) {
+				// 如果toString抛异常，认为不包含
+				return false;
+			}
+			return obj.toString().contains(elementStr);
 		}
 		if (obj instanceof Collection) {
 			return ((Collection<?>) obj).contains(element);

hutool-core/src/test/java/cn/hutool/core/util/ObjectUtilTest.java

@@ -135,4 +135,46 @@ public class ObjectUtilTest {
 		// 枚举已经无法使用
 		assertFalse(enumeration.hasMoreElements());
 	}
+
+	@Test
+	public void testContainsElementToStringReturnsNull() {
+		Object problematicElement = new Object() {
+			@Override
+			public String toString() {
+				return null; // 返回 null 的 toString
+			}
+		};
+		assertFalse(ObjectUtil.contains("test", problematicElement)); //不会抛异常
+	}
+
+	@Test
+	public void testContainsElementToStringInvalidSyntax() {
+		//字符串包含自定义User对象不符合语义
+		assertFalse(ObjectUtil.contains("User[id=123]", new User(123)));
+	}
+
+
+	static class User{
+		private int id;
+		public User(int id) {
+			this.id = id;
+		}
+		@Override
+		public String toString() {
+			return "User[" +
+					"id=" + id +
+					']';
+		}
+	}
+
+	@Test
+	public void testContainsCharSequenceSupported() {
+		//contains方法支持String、StringBuilder、StringBuffer
+		StringBuilder stringBuilder = new StringBuilder("hello world");
+		StringBuffer stringBuffer = new StringBuffer("hello world");
+		String str = "hello world";
+		assertTrue((ObjectUtil.contains(stringBuilder, "world")));
+		assertTrue(ObjectUtil.contains(stringBuffer, "hello"));
+		assertTrue(ObjectUtil.contains(str, "hello"));
+	}
 }