Simple conversion between java util Date and XMLGregorianCalendar

Question

I m looking for a simple method of converting between java util Date and javax xml datatype XMLGregorianCalendar in both directions    Here is the code that I m using now     import java util GregorianCalendar  import javax xml datatype DatatypeConfigurationException  import javax xml datatype DatatypeFactory  import javax xml datatype XMLGregorianCalendar          Utility class for converting between XMLGregorianCalendar and java util Date     public class XMLGregorianCalendarConverter                     Needed to create XMLGregorianCalendar instances             private static DatatypeFactory df   null      static           try               df   DatatypeFactory newInstance              catch  DatatypeConfigurationException dce                throw new IllegalStateException                   Exception while obtaining DatatypeFactory instance   dce                                     Converts a java util Date into an instance of XMLGregorianCalendar                param date Instance of java util Date or a null reference         return XMLGregorianCalendar instance whose value is based upon the         value in the date parameter  If the date parameter is null then         this method will simply return null              public static XMLGregorianCalendar asXMLGregorianCalendar java util Date date            if  date    null                return null            else               GregorianCalendar gc   new GregorianCalendar                gc setTimeInMillis date getTime                 return df newXMLGregorianCalendar gc                                   Converts an XMLGregorianCalendar to an instance of java util Date                param xgc Instance of XMLGregorianCalendar or a null reference         return java util Date instance whose value is based upon the         value in the xgc parameter  If the xgc parameter is null then         this method will simply return null              public static java util Date asDate XMLGregorianCalendar xgc            if  xgc    null                return null            else               return xgc toGregorianCalendar   getTime                        Is there anything simpler  like some API call that I have overlooked    Converting between a standard XML date time and a Java date object seems like a pretty routine task and I m surprised that I have to write this code at all   Any suggestions   NOTES  My JAXB classes are autogenerated from a schema  The build process on my project does not allow for me to make manual changes to the generated classes  The xs dateTime elements are being generated by XJC as XMLGregorianCalendar in the JAXB classes  The schema is extended and tweaked periodically  so I am allowed to make limited changes to the schema XSD file   UPDATE ON SOLUTION   The solution proposed by Blaise has allowed me to take XMLGregorianCalendar out of the mix and deal with java util Calendar objects instead  By adding a JAXB binding clause at the top of my schema file  XJC is able to generate more appropriate mappings for xs dateTime in my JAXB classes  Here are some snippets that show the modifications in my XSD file   The root element in the XSD file    lt xs schema xmlns mydata  http   my example com mydata  xmlns xs  http   www w3 org 2001 XMLSchema  xmlns jaxb  http   java sun com xml ns jaxb  targetNamespace  http   my example com mydata  elementFormDefault  unqualified  attributeFormDefault  unqualified  version  0 2  xml lang  en  jaxb version  2 0  gt    JAXB binding annotation block  inserted immediately after root element in XSD    lt xs annotation gt       lt xs appinfo gt           lt jaxb globalBindings gt               lt jaxb javaType name  java util Calendar  xmlType  xs dateTime  parseMethod  javax xml bind DatatypeConverter parseDateTime  printMethod  javax xml bind DatatypeConverter printDateTime    gt           lt  jaxb globalBindings gt       lt  xs appinfo gt   lt  xs annotation gt    Since the XML xs dateTime field also stores timezone  it might be better for me to work with Calendar instead of Date anyway since Calendar objects have a pretty good API for working with locales and timezones  In any case  I m much happier to deal with Calendar objects instead of XMLGregorianCalendar  No need for the conversion methods that I listed above anymore  I didn t get all the way to java util Date  but close enough

User · Accepted Answer

Why not use an external binding file to tell XJC to generate java util Date fields instead of XMLGregorianCalendar   Also see  How do I map xs date to java util Date  Blog

User · Answer

You can use the this customization to change the default mapping to java util Date   lt xsd annotation gt   lt xsd appinfo gt       lt jaxb globalBindings gt           lt jaxb javaType name  java util Date  xmlType  xsd dateTime                   parseMethod  org apache cxf xjc runtime DataTypeAdapter parseDateTime                   printMethod  org apache cxf xjc runtime DataTypeAdapter printDateTime   gt       lt  jaxb globalBindings gt   lt  xsd appinfo gt

User · Answer

I too had this kind of headache  Got rid of of it by simply representing time fields as primitive long in my POJO  Now the generation of my WS client code handle everything correctly and no more XML-to-Java crap  And of course dealing with millis on the Java side is simple and painless  KISS principle rocks

User · Answer

I had to make some changes to make it work  as some things seem to have changed in the meantime    xjc would complain that my adapter does not extend XmlAdapter some bizarre and unneeded imports were drawn in  org w3  2001 xmlschema  the parsing methods must not be static when extending the XmlAdapter  obviously   Here s a working example  hope this helps  I m using JodaTime but in this case SimpleDate would be sufficient          import java util Date  import javax xml bind DatatypeConverter  import javax xml bind annotation adapters XmlAdapter  import org joda time DateTime   public class DateAdapter extends XmlAdapter lt Object  Object gt         Override     public Object marshal Object dt  throws Exception           return new DateTime  Date  dt  toString  YYYY-MM-dd                Override         public Object unmarshal Object s  throws Exception           return DatatypeConverter parseDate  String  s  getTime                In the xsd  I have followed the excellent references given above  so I have included this xml annotation    lt xsd appinfo gt       lt jaxb schemaBindings gt           lt jaxb package name  at mycomp xml    gt       lt  jaxb schemaBindings gt       lt jaxb globalBindings gt           lt jaxb javaType name  java util Date  xmlType  xsd date                parseMethod  at mycomp xml DateAdapter unmarshal            printMethod  at mycomp xml DateAdapter marshal    gt       lt  jaxb globalBindings gt   lt  xsd appinfo gt

User · Answer

From java util Date to XMLGregorianCalendar  you can simply do   import javax xml datatype XMLGregorianCalendar  import javax xml datatype DatatypeFactory  import java util GregorianCalendar         GregorianCalendar gcalendar   new GregorianCalendar    gcalendar setTime yourDate   XMLGregorianCalendar xmlDate   DatatypeFactory newInstance   newXMLGregorianCalendar gcalendar     Code edited after the first comment of  f-puras  by cause i do a mistake

User · Answer

Customizing the Calendar and Date while Marshaling   Step 1   Prepare jaxb binding xml for custom properties  In this case i prepared for date and calendar   lt jaxb bindings version  2 1  xmlns jaxb  http   java sun com xml ns jaxb  xmlns xjc  http   java sun com xml ns jaxb xjc   xmlns xs  http   www w3 org 2001 XMLSchema  gt   lt jaxb globalBindings generateElementProperty  false  gt   lt jaxb serializable uid  1    gt   lt jaxb javaType name  java util Date  xmlType  xs date      parseMethod  org apache cxf tools common DataTypeAdapter parseDate      printMethod  com stech jaxb util CalendarTypeConverter printDate    gt   lt jaxb javaType name  java util Calendar  xmlType  xs dateTime      parseMethod  javax xml bind DatatypeConverter parseDateTime      printMethod  com stech jaxb util CalendarTypeConverter printCalendar    gt       Setp 2   Add custom jaxb binding file to Apache or any related plugins at xsd option like mentioned below   lt xsdOption gt     lt xsd gt   project basedir  src main resources tutorial xsd yourxsdfile xsd lt  xsd gt     lt packagename gt com tutorial xml packagename lt  packagename gt     lt bindingFile gt   project basedir  src main resources xsd jaxbbindings xml lt  bindingFile gt   lt  xsdOption gt    Setp 3   write the code for CalendarConverter class  package com stech jaxb util   import java text SimpleDateFormat          To convert the calendar to JaxB customer format           public final class CalendarTypeConverter                   Calendar to custom format print to XML                  param val         return             public static String printCalendar java util Calendar val            SimpleDateFormat simpleDateFormat   new SimpleDateFormat  yyyy-MM-dd T hh mm ss            return simpleDateFormat format val getTime                           Date to custom format print to XML                  param val         return             public static String printDate java util Date val            SimpleDateFormat simpleDateFormat   new SimpleDateFormat  yyyy-MM-dd            return simpleDateFormat format val             Setp 4   Output     lt xmlHeader gt      lt creationTime gt 2014-09-25T07 23 05 lt  creationTime gt  Calendar class formatted      lt fileDate gt 2014-09-25 lt  fileDate gt  - Date class formatted  lt  xmlHeader gt

User · Answer

From XMLGregorianCalendar to java util Date you can simply do   java util Date dt   xmlGregorianCalendarInstance toGregorianCalendar   getTime

[java] Simple conversion between java.util.Date and XMLGregorianCalendar

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