✨ 优化 mica-core 删除 FastDateFormat，存在线程安全风险。

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.SneakyThrows;
-import net.dreamlu.mica.core.utils.DateUtil;
-import net.dreamlu.mica.core.utils.ReflectUtil;
-
-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;
-import java.util.TimeZone;
-
-/**
- * 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
-public class FastDateFormat extends DateFormat {
-	private static final java.lang.reflect.Field FIELD = getToStringCacheField();
-	private static final boolean FIELD_IS_STRING = FIELD != null && FIELD.getType() == String.class;
-	private 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) {
-		String value = DateUtil.format(date, formatter);
-		if (value == null) {
-			return stringBuffer;
-		}
-		// jdk8-b91 之前没有该方法
-		if (FIELD == null) {
-			return stringBuffer.append(value);
-		}
-		// 兼容 java8 和 java8+
-		if (FIELD_IS_STRING) {
-			FIELD.set(stringBuffer, value);
-		} else {
-			FIELD.set(stringBuffer, value.toCharArray());
-		}
-		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 = ReflectUtil.getField(StringBuffer.class, "toStringCache");
-		if (field != null) {
-			field.setAccessible(true);
-		}
-		return field;
-	}
-
-	@Override
-	public synchronized void setTimeZone(TimeZone zone) {
-		this.formatter = this.formatter.withZone(zone.toZoneId());
-	}
-
-	@Override
-	public TimeZone getTimeZone() {
-		return TimeZone.getTimeZone(this.formatter.getZone());
-	}
-
-	@Override
-	public Object clone() {
-		// formatter 线程安全，返回 this 性能会更好。
-		return this;
-	}
-}

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 FastDateFormat(DateUtil.PATTERN_DATETIME, CHINA));
+			super.setDateFormat(new SimpleDateFormat(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