fix code

hutool-core/src/main/java/cn/hutool/core/convert/CompositeConverter.java

@@ -98,20 +98,22 @@ public class CompositeConverter extends RegisterConverter {
 	 */
 	@SuppressWarnings("unchecked")
 	public <T> T convert(Type type, final Object value, final T defaultValue, final boolean isCustomFirst) throws ConvertException {
-		if (TypeUtil.isUnknown(type) && null == defaultValue) {
-			// 对于用户不指定目标类型的情况，返回原值
-			return (T) value;
-		}
 		if (ObjUtil.isNull(value)) {
 			return defaultValue;
 		}
 		if (TypeUtil.isUnknown(type)) {
+			// 对于用户不指定目标类型的情况，返回原值
 			if(null == defaultValue){
-				throw new ConvertException("Unsupported convert to unKnow type: {}", type);
+				return (T) value;
 			}
 			type = defaultValue.getClass();
 		}
 
+		// value本身实现了Converter接口，直接调用
+		if(value instanceof Converter){
+			return ((Converter) value).convert(type, value, defaultValue);
+		}
+
 		if (type instanceof TypeReference) {
 			type = ((TypeReference<?>) type).getType();
 		}

hutool-core/src/main/java/cn/hutool/core/convert/impl/BeanConverter.java

@@ -57,6 +57,11 @@ public class BeanConverter implements Converter, Serializable {
 			return null;
 		}
 
+		// value本身实现了Converter接口，直接调用
+		if(value instanceof Converter){
+			return ((Converter) value).convert(targetType, value);
+		}
+
 		Class<?> targetClass = TypeUtil.getClass(targetType);
 		Assert.notNull(targetClass, "Target type is not a class!");
 
@@ -79,6 +84,6 @@ public class BeanConverter implements Converter, Serializable {
 			return SerializeUtil.deserialize((byte[]) value);
 		}
 
-		throw new ConvertException("Unsupported source type: {}", value.getClass());
+		throw new ConvertException("Unsupported source type: [{}] to [{}]", value.getClass(), targetType);
 	}
 }

hutool-core/src/main/java/cn/hutool/core/convert/impl/DateConverter.java

@@ -67,7 +67,7 @@ public class DateConverter extends AbstractConverter {
 			return wrap(targetClass, DateUtil.date((TemporalAccessor) value));
 		} else if (value instanceof Calendar) {
 			return wrap(targetClass, DateUtil.date((Calendar) value));
-		} else if (value instanceof Number) {
+		} else if (null == this.format && value instanceof Number) {
 			return wrap(targetClass, ((Number) value).longValue());
 		} else {
 			// 统一按照字符串处理