XMLGregorianCalendar 和 Calendar 之间的转换器

XMLGregorianCalendar 的month是从1开始到12
GregorianCalendar 的month是从0到11

package org.stephencat.ws.util;
import org.apache.commons.beanutils.*;

import java.util.Calendar;
import javax.xml.datatype.XMLGregorianCalendar;
import com.sun.org.apache.xerces.internal.jaxp.datatype.XMLGregorianCalendarImpl;

/**
 * XMLGregorianCalendar 和 Calendar 之间的转换器，适用于 Apache Commons BeanUtils.copyProperties 方法。<br>
 * 使用示例：
 * <pre>
 * import org.apache.commons.beanutils.*;
 * import javax.xml.datatype.XMLGregorianCalendar;
 * import java.util.Canlendar;
 *  
 *  
 * // 当需要转换为 XMLGregorianCalendar 类型时使用
 * ConvertUtils.register(new XMLGregorianCalendarConverter(), XMLGregorianCalendar.class);
 * // 当需要转换为 Calendar 类型时使用
 * ConvertUtils.register(new XMLGregorianCalendarConverter(), Calendar.class);
 * BeanUtils.copyProperties(destObj, srcObj);
 * </pre>
 * <p>注意：java.util.Calendar 的时区 (ZONE_OFFSET) 是以毫秒为单位的值。</p>
 * 
 * @author Stephen WJJ
 *
 */
public class XMLGregorianCalendarConverter implements Converter {

    public Object convert(Class arg0, Object arg1) {
        if(arg1 instanceof XMLGregorianCalendar){
            return this.convert(arg0, (XMLGregorianCalendar)arg1);
        }else{
            return this.convert(arg0, (Calendar)arg1);
        }
    }
    
    public Calendar convert(Class calendarType, XMLGregorianCalendar xmlCalendar){
        return xmlCalendar.toGregorianCalendar();
    }
    
    public XMLGregorianCalendar convert(Class xmlCalendarType, Calendar calendar){
        XMLGregorianCalendar cal = new XMLGregorianCalendarImpl();
        cal.setYear(calendar.get(Calendar.YEAR));
        cal.setMonth(calendar.get(Calendar.MONTH) +1);
        cal.setDay(calendar.get(Calendar.DAY_OF_MONTH));
        cal.setHour(calendar.get(Calendar.HOUR_OF_DAY));
        cal.setMinute(calendar.get(Calendar.MINUTE));
        cal.setSecond(calendar.get(Calendar.SECOND));
        cal.setMillisecond(calendar.get(Calendar.MILLISECOND));
        cal.setTimezone(calendar.get(Calendar.ZONE_OFFSET) / 60000 );
        return cal;
    }

}