✨ 优化 mica-core DateUtil。

mica-core/src/main/java/net/dreamlu/mica/core/format/FastDateFormat.java

+/*
+ * Copyright (c) 2019-2029, Dreamlu 卢春梦 (596392912@qq.com & www.dreamlu.net).
+ * <p>
+ * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.gnu.org/licenses/lgpl.html
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.dreamlu.mica.core.format;
+
+import lombok.Getter;
+import lombok.Setter;
+import lombok.SneakyThrows;
+import net.dreamlu.mica.core.utils.DateUtil;
+
+import java.text.DateFormat;
+import java.text.FieldPosition;
+import java.text.ParsePosition;
+import java.time.format.DateTimeFormatter;
+import java.util.Date;
+import java.util.Locale;
+
+/**
+ * 线程安全、高性能的 DateFormat
+ *
+ * <p>
+ * 用于某些参数为 DateFormat 的组件中，对于业务代码推荐直接使用 DateUtil 性能会更好。
+ * </p>
+ *
+ * @author L.cm
+ */
+@Getter
+@Setter
+public class FastDateFormat extends DateFormat {
+	private static final java.lang.reflect.Field FIELD = getToStringCacheField();
+	private final DateTimeFormatter formatter;
+
+	public FastDateFormat(DateTimeFormatter formatter) {
+		this.formatter = formatter;
+	}
+
+	public FastDateFormat(String pattern) {
+		this(DateTimeFormatter.ofPattern(pattern));
+	}
+
+	public FastDateFormat(String pattern, Locale locale) {
+		this(DateTimeFormatter.ofPattern(pattern, locale));
+	}
+
+	@SneakyThrows
+	@Override
+	public StringBuffer format(Date date, StringBuffer stringBuffer, FieldPosition fieldPosition) {
+		FIELD.set(stringBuffer, DateUtil.format(date, formatter));
+		return stringBuffer;
+	}
+
+	@Override
+	public Date parse(String source) {
+		return DateUtil.parse(source, formatter);
+	}
+
+	@Override
+	public Date parse(String dateStr, ParsePosition parsePosition) {
+		return null;
+	}
+
+	@SneakyThrows
+	private static java.lang.reflect.Field getToStringCacheField() {
+		java.lang.reflect.Field field = StringBuffer.class.getDeclaredField("toStringCache");
+		field.setAccessible(true);
+		return field;
+	}
+
+}

mica-core/src/main/java/net/dreamlu/mica/core/utils/DateUtil.java

@@ -310,10 +310,7 @@ public class DateUtil {
 	 */
 	@Nullable
 	public static String formatDateTime(@Nullable Date date) {
-		if (date == null) {
-			return null;
-		}
-		return DATETIME_FORMATTER.format(date.toInstant());
+		return format(date, DATETIME_FORMATTER);
 	}
 
 	/**
@@ -324,10 +321,7 @@ public class DateUtil {
 	 */
 	@Nullable
 	public static String formatDate(@Nullable Date date) {
-		if (date == null) {
-			return null;
-		}
-		return DATE_FORMATTER.format(date.toInstant());
+		return format(date, DATE_FORMATTER);
 	}
 
 	/**
@@ -338,10 +332,7 @@ public class DateUtil {
 	 */
 	@Nullable
 	public static String formatTime(@Nullable Date date) {
-		if (date == null) {
-			return null;
-		}
-		return TIME_FORMATTER.format(date.toInstant());
+		return format(date, TIME_FORMATTER);
 	}
 
 	/**
@@ -353,10 +344,38 @@ public class DateUtil {
 	 */
 	@Nullable
 	public static String format(@Nullable Date date, String pattern) {
+		return format(date, DateTimeFormatter.ofPattern(pattern));
+	}
+
+	/**
+	 * 日期格式化
+	 *
+	 * @param date      时间
+	 * @param formatter 格式化
+	 * @return 格式化后的时间
+	 */
+	@Nullable
+	public static String format(@Nullable Date date, DateTimeFormatter formatter) {
 		if (date == null) {
 			return null;
 		}
-		return DateTimeFormatter.ofPattern(pattern).withZone(ZoneId.systemDefault()).format(date.toInstant());
+		return format(date.toInstant(), formatter);
+	}
+
+	/**
+	 * 日期格式化
+	 *
+	 * @param instant   时间
+	 * @param formatter 格式化
+	 * @return 格式化后的时间
+	 */
+	@Nullable
+	public static String format(Instant instant, DateTimeFormatter formatter) {
+		ZoneId zone = formatter.getZone();
+		if (zone == null) {
+			return formatter.withZone(ZoneId.systemDefault()).format(instant);
+		}
+		return formatter.format(instant);
 	}
 
 	/**

mica-core/src/main/java/net/dreamlu/mica/core/utils/JsonUtil.java

@@ -26,12 +26,12 @@ import com.fasterxml.jackson.databind.*;
 import com.fasterxml.jackson.databind.type.CollectionLikeType;
 import com.fasterxml.jackson.databind.type.MapType;
 import lombok.experimental.UtilityClass;
+import net.dreamlu.mica.core.format.FastDateFormat;
 import net.dreamlu.mica.core.function.CheckedConsumer;
 import org.springframework.lang.Nullable;
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.text.SimpleDateFormat;
 import java.time.ZoneId;
 import java.util.*;
 
@@ -564,7 +564,7 @@ public class JsonUtil {
 		JacksonObjectMapper() {
 			super(jsonFactory());
 			super.setLocale(CHINA);
-			super.setDateFormat(new SimpleDateFormat(DateUtil.PATTERN_DATETIME, CHINA));
+			super.setDateFormat(new FastDateFormat(DateUtil.PATTERN_DATETIME, CHINA));
 			// 单引号
 			super.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
 			// 忽略json字符串中不识别的属性