add method

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

@@ -25,6 +25,7 @@ import cn.hutool.core.convert.impl.TimeZoneConverter;
 import cn.hutool.core.convert.impl.URIConverter;
 import cn.hutool.core.convert.impl.URLConverter;
 import cn.hutool.core.convert.impl.UUIDConverter;
+import cn.hutool.core.convert.impl.XMLGregorianCalendarConverter;
 import cn.hutool.core.convert.impl.ZoneIdConverter;
 import cn.hutool.core.date.DateTime;
 import cn.hutool.core.lang.Opt;
@@ -32,6 +33,7 @@ import cn.hutool.core.reflect.ClassUtil;
 import cn.hutool.core.reflect.TypeUtil;
 import cn.hutool.core.util.ServiceLoaderUtil;
 
+import javax.xml.datatype.XMLGregorianCalendar;
 import java.io.Serializable;
 import java.lang.ref.SoftReference;
 import java.lang.ref.WeakReference;
@@ -183,6 +185,7 @@ public class RegisterConverter implements Converter, Serializable {
 
 		// 日期时间
 		defaultConverterMap.put(Calendar.class, new CalendarConverter());
+		defaultConverterMap.put(XMLGregorianCalendar.class, new XMLGregorianCalendarConverter());
 		defaultConverterMap.put(java.util.Date.class, DateConverter.INSTANCE);
 		defaultConverterMap.put(DateTime.class, DateConverter.INSTANCE);
 		defaultConverterMap.put(java.sql.Date.class, DateConverter.INSTANCE);

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

@@ -4,6 +4,7 @@ import cn.hutool.core.convert.AbstractConverter;
 import cn.hutool.core.date.DateUtil;
 import cn.hutool.core.text.StrUtil;
 
+import javax.xml.datatype.XMLGregorianCalendar;
 import java.util.Calendar;
 import java.util.Date;
 
@@ -50,6 +51,10 @@ public class CalendarConverter extends AbstractConverter {
 			return DateUtil.calendar((Long)value);
 		}
 
+		if(value instanceof XMLGregorianCalendar){
+			return DateUtil.calendar((XMLGregorianCalendar) value);
+		}
+
 		final String valueStr = convertToStr(value);
 		return DateUtil.calendar(StrUtil.isBlank(format) ? DateUtil.parse(valueStr) : DateUtil.parse(valueStr, format));
 	}

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

@@ -0,0 +1,87 @@
+package cn.hutool.core.convert.impl;
+
+import cn.hutool.core.convert.AbstractConverter;
+import cn.hutool.core.convert.ConvertException;
+import cn.hutool.core.date.DateException;
+import cn.hutool.core.date.DateUtil;
+import cn.hutool.core.text.StrUtil;
+
+import javax.xml.datatype.DatatypeConfigurationException;
+import javax.xml.datatype.DatatypeFactory;
+import javax.xml.datatype.XMLGregorianCalendar;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.GregorianCalendar;
+
+/**
+ * 日期转换器
+ *
+ * @author Looly
+ *
+ */
+public class XMLGregorianCalendarConverter extends AbstractConverter {
+	private static final long serialVersionUID = 1L;
+
+	/** 日期格式化 */
+	private String format;
+	private final DatatypeFactory datatypeFactory;
+
+	/**
+	 * 构造
+	 */
+	public XMLGregorianCalendarConverter(){
+		try {
+			datatypeFactory = DatatypeFactory.newInstance();
+		} catch (final DatatypeConfigurationException e) {
+			throw new DateException(e);
+		}
+	}
+
+	/**
+	 * 获取日期格式
+	 *
+	 * @return 设置日期格式
+	 */
+	public String getFormat() {
+		return format;
+	}
+
+	/**
+	 * 设置日期格式
+	 *
+	 * @param format 日期格式
+	 */
+	public void setFormat(final String format) {
+		this.format = format;
+	}
+
+	@Override
+	protected XMLGregorianCalendar convertInternal(final Class<?> targetClass, final Object value) {
+		if(value instanceof GregorianCalendar){
+			return datatypeFactory.newXMLGregorianCalendar((GregorianCalendar) value);
+		}
+
+		final GregorianCalendar gregorianCalendar = new GregorianCalendar();
+		// Handle Date
+		if (value instanceof Date) {
+			gregorianCalendar.setTime((Date) value);
+		} else if(value instanceof Calendar){
+			final Calendar calendar = (Calendar) value;
+			gregorianCalendar.setTimeZone(calendar.getTimeZone());
+			gregorianCalendar.setFirstDayOfWeek(calendar.getFirstDayOfWeek());
+			gregorianCalendar.setLenient(calendar.isLenient());
+			gregorianCalendar.setTimeInMillis(calendar.getTimeInMillis());
+		}else if (value instanceof Long) {
+			gregorianCalendar.setTimeInMillis((Long) value);
+		} else{
+			final String valueStr = convertToStr(value);
+			final Date date = StrUtil.isBlank(format) ? DateUtil.parse(valueStr) : DateUtil.parse(valueStr, format);
+			if(null == date){
+				throw new ConvertException("Unsupported date value: " + value);
+			}
+			gregorianCalendar.setTime(date);
+		}
+		return datatypeFactory.newXMLGregorianCalendar(gregorianCalendar);
+	}
+
+}

hutool-core/src/main/java/cn/hutool/core/date/CalendarUtil.java

@@ -9,6 +9,7 @@ import cn.hutool.core.date.format.parser.PositionDateParser;
 import cn.hutool.core.util.ObjUtil;
 import cn.hutool.core.text.StrUtil;
 
+import javax.xml.datatype.XMLGregorianCalendar;
 import java.text.ParsePosition;
 import java.time.Instant;
 import java.time.LocalDateTime;
@@ -50,6 +51,16 @@ public class CalendarUtil {
 		}
 	}
 
+	/**
+	 * 转换为Calendar对象
+	 *
+	 * @param calendar 日期对象
+	 * @return Calendar对象
+	 */
+	public static Calendar calendar(final XMLGregorianCalendar calendar) {
+		return calendar.toGregorianCalendar();
+	}
+
 	/**
 	 * 转换为Calendar对象，使用当前默认时区
 	 *

hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java

@@ -17,6 +17,7 @@ import cn.hutool.core.regex.PatternPool;
 import cn.hutool.core.regex.ReUtil;
 import cn.hutool.core.text.StrUtil;
 
+import javax.xml.datatype.XMLGregorianCalendar;
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
 import java.time.Instant;
@@ -78,7 +79,7 @@ public class DateUtil extends CalendarUtil {
 	 * {@link Date}类型时间转为{@link DateTime}<br>
 	 * 如果date本身为DateTime对象，则返回强转后的对象，否则新建一个DateTime对象
 	 *
-	 * @param date Long类型Date（Unix时间戳）
+	 * @param date {@link Date}
 	 * @return 时间对象
 	 * @since 3.0.7
 	 */
@@ -89,6 +90,17 @@ public class DateUtil extends CalendarUtil {
 		return dateNew(date);
 	}
 
+	/**
+	 * {@link XMLGregorianCalendar}类型时间转为{@link DateTime}
+	 *
+	 * @param date {@link XMLGregorianCalendar}
+	 * @return 时间对象
+	 * @since 6.0.0
+	 */
+	public static DateTime date(final XMLGregorianCalendar date) {
+		return date(date.toGregorianCalendar());
+	}
+
 	/**
 	 * 根据已有{@link Date} 产生新的{@link DateTime}对象
 	 *

hutool-core/src/test/java/cn/hutool/core/convert/XMLGregorianCalendarConverterTest.java

@@ -0,0 +1,16 @@
+package cn.hutool.core.convert;
+
+import cn.hutool.core.date.DateUtil;
+import org.junit.Assert;
+import org.junit.Test;
+
+import javax.xml.datatype.XMLGregorianCalendar;
+
+public class XMLGregorianCalendarConverterTest {
+
+	@Test
+	public void convertTest(){
+		final XMLGregorianCalendar calendar = Convert.convert(XMLGregorianCalendar.class, DateUtil.parse("2022-01-03 04:00:00"));
+		Assert.assertNotNull(calendar);
+	}
+}