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Judul : Jaxb Appointment Format Event Using Musical Note | Coffee Appointment To Xml Datetime String Conversion
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Jaxb Appointment Format Event Using Musical Note | Coffee Appointment To Xml Datetime String Conversion

One of the mutual work acre marshaling Java object to XML String using JAXB is the default format of appointment too fourth dimension provided past times JAXB. When JAXB converts whatsoever Date type object or XMLGregorianCalendar to XML String, just xsd:dateTime element, it past times default prints unformatted appointment e.g. 2012-05-17T09:20:00-04:30. Since most of the existent world, Java application has a requirement to impress appointment inward a especial format similar dd-MM-yyyy or include appointment too fourth dimension inward format dd-MM-yyyy HH:mm:ss, it becomes a problem. Thankfully, JAXB is real extensible too provides hooks too adapters to customize marshaling too unmarshaling process. You tin define an extension of XmlAdapter to command too customize marshaling too unmarshaling or whatsoever Java type depending upon yours need.

In this JAXB tutorial, nosotros volition run across an event of customizing JAXB to format appointment too fourth dimension inward an application specific format.

For our purpose, nosotros volition utilization the SimpleDateFormat class, which has its ain issues, but that's ok for demonstration purpose. To acquire a clarity of what is the number amongst the appointment format, too what nosotros are doing inward this example, consider next xml snippet, which is created from our Employee object, without formatting Date, XML volition expect like:

<employee> <name>John</name> <dateofbirth>1985-01-15T18:30:00-04:00</dateofbirth> <dateofjoining>2012-05-17T09:20:00-04:30</dateofjoining> </employee> 

While afterward using XmlAdapter for controlling marshaling of appointment object inward JAXB, our XML String snippet volition expect similar below:

XML String afterward formatting appointment inward dd-MM-yyyy HH:mm:ss format

<employee>  <name>John</name>  <dateofbirth>15-01-1985 18:30:00</dateofbirth>  <dateofjoining>17-05-2012 09:20:00</dateofjoining> </employee> 

You tin run across that, inward the instant XML, dates are properly formatted including both appointment too fourth dimension information. You tin fifty-fifty farther customize it into several other appointment formats e.g. MM/dd/yyyy, yous only involve to recall SimpleDateFormat syntax for formatting dates, equally shown here.

JAXB Date Format Example

Here is the consummate code event of formatting dates inward JAXB. It allows yous to specify Adapters, which tin survive used for marshaling too unmarshaling dissimilar types of object, for example, yous tin specify DateTimeAdapter for converting Date to String during marshaling, too XML String to Date during unmarshaling.

Apart from writing your ain Adapter, which should extend the XmlAdapter class, yous equally good involve to utilization notation @XmlJavaTypeAdapter to specify that JAXB should utilization that adapter for marshaling too unmarshalling of a especial object.

In this JAXB tutorial, nosotros accept written our ain DateTimeAdapter, which extends XmlAdapter too overrides marshal(Date object) too unmarshal(String xml) methods. JAXB calls marshal method, acre converting Java Object to XML document, too unmarshal method to bind XML document to Java object.

We are equally good using SimpleDateFormat class, to format Date object into dd-MM-yyyy HH:mm:ss format, which impress appointment equally 15-01-1985 18:30:00. By the way, survive careful acre using SimpleDateFormat, equally it's non thread-safe.




Java Program to convert Java Object to XML amongst formatted Dates

import java.io.StringWriter; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar;  import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.adapters.XmlAdapter; import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;  /**  *  * JAXB tutorial to format Date to XML String acre converting Java object to  * XML documents i.e. during marshalling.  *  * @author Javin Paul  */ public class JAXBDateFormatTutorial {      public static void main(String args[]) {            Date dob = new GregorianCalendar(1985,Calendar.JANUARY, 15, 18, 30).getTime();        Date doj = new GregorianCalendar(2012,Calendar.MAY, 17, 9, 20).getTime();                  Employee privy = new Employee("John", dob, doj);          // Marshaling Employee object to XML using JAXB        JAXBContext ctx = null;        StringWriter author = new StringWriter();          try{            ctx = JAXBContext.newInstance(Employee.class);            ctx.createMarshaller().marshal(john, writer);            System.out.println("Employee object equally XML");            System.out.println(writer);              }catch(JAXBException ex){            ex.printStackTrace();        }     }  }

When yous volition run this plan it volition impress the Employee object inward XML equally shown below:

Employee object equally XML <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <employee> <name>John</name> <dateOfBirth>15-01-1985 18:30:00</dateOfBirth> <dateOfJoining>17-05-2012 09:20:00</dateOfJoining> </employee>

You tin run across that dates are nicely formatted too at that topographic point is no to a greater extent than T inward betwixt equally it was before.

In this program, at that topographic point are 3 top dog classes: Employee, DateTimeAdapter, too JAXBDateFormatTutorial, each shape is coded inward their respective file because they are populace classes e.g. Employee.java contains Employee class. If yous desire to include too thus inward the same file, only take the public modifier from Employee too DateTimeAdapter class.

The Employee shape is your domain object acre DateTimeAdapter is an extension of XmlAdapter to format dates acre converting XML to Java object too vice-versa. As I said, JAXB is real extensible too provides a lot of hooks where yous tin insert your ain code for customization. If yous desire to larn to a greater extent than well-nigh advanced usage of JAXB, I advise yous reading Core Java Volume II - Advanced Features past times Cay S. Horstmann, ane of the best books to larn XML parsing inward Java.

Employee.java

@XmlRootElement(name="employee") @XmlAccessorType(XmlAccessType.FIELD)   public class Employee{     @XmlElement(name="name")     private String name;      @XmlElement(name="dateOfBirth")         @XmlJavaTypeAdapter(DateTimeAdapter.class)     private Date dateOfBirth;      @XmlElement(name="dateOfJoining")     @XmlJavaTypeAdapter(DateTimeAdapter.class)     private Date dateOfJoining;      // no-arg default constructor for JAXB     public Employee(){}      public Employee(String name, Date dateOfBirth, Date dateOfJoining) {         this.name = name;         this.dateOfBirth = dateOfBirth;         this.dateOfJoining = dateOfJoining;     }      public Date getDateOfBirth() {         return dateOfBirth;     }      public void setDateOfBirth(Date dateOfBirth) {         this.dateOfBirth = dateOfBirth;     }      public Date getDateOfJoining() {         return dateOfJoining;     }      public void setDateOfJoining(Date dateOfJoining) {         this.dateOfJoining = dateOfJoining;     }      public String getName() {         return name;     }      public void setName(String name) {         this.name = name;     }      @Override     public String toString() {         return "Employee{" + "name=" + advert + ", dateOfBirth="                 + dateOfBirth + ", dateOfJoining=" + dateOfJoining + '}';      }  }

DateTimeAdapter.java

public class DateTimeAdapter extends XmlAdapter<String, Date>{     private final DateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");      @Override     public Date unmarshal(String xml) throws Exception {         return dateFormat.parse(xml);     }      @Override     public String marshal(Date object) throws Exception {         return dateFormat.format(object);     }  }

Things to Remember

Here are a couplet of of import things to recall while

1) Don't forget to supply a no declaration default constructor for your domain object e.g. Employee, failing to do volition upshot inward the next mistake acre marshaling Java Object to XML String:

com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions Employee does non accept a no-arg default constructor.
this work is related to the next location:

at Employee
at com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:91)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:436)

at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.(JAXBContextImpl.java:277)

That's all on How to format Dates inward JAXB. We accept non only learned Date formatting during marshaling of the Date object but equally good seen how to customize JAXB marshaling too unmarshalling process. You tin utilization this technique to customize marshaling of whatsoever Java type e.g. BigDecimal, float, or double etc. Just recall to utilization notation @XmlJavaTypeAdapter to specify the advert of your custom appointment too fourth dimension Adapter to JAXB marshaller.

Further Learning
Java In-Depth: Become a Complete Java Engineer!
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Thanks for reading this tutorial, if yous similar this tutorial too thus delight part amongst your friends too colleagues. If yous accept whatsoever proffer too feedback too thus delight part amongst us.

P.S. - If yous are interested inward learning how to bargain amongst XML inward Java inward to a greater extent than details, yous tin read Java too XML - Solutions of Real World Problem past times Brett McLaughlin. It covers everything amongst abide by to parsing XML e.g. SAX, DOM, too StAX parser, JAXB, XPath, XSLT, too JAXB. One of the practiced majority for advanced Java developers. 

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