如何指定JAXB在marshal生成xml时日期的格式

参考文章：http://stackoverflow.com/questions/13568543/how-do-you-specify-the-date-format-used-when-jaxb-marshals-xsddatetime


方法1：instance级别指定，即每次使用时指定

public static XMLGregorianCalendar getXmlDate(Date date) throws DatatypeConfigurationException {
    return DatatypeFactory.newInstance().newXMLGregorianCalendar(new SimpleDateFormat("yyyy-MM-dd").format(date));
}

public static XMLGregorianCalendar getXmlDateTime(Date date) throws DatatypeConfigurationException {
    return DatatypeFactory.newInstance().newXMLGregorianCalendar(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss").format(date));
}

方法2：class级别，即使用Adapter,为一个类的某个属性都使用设置好的日期格式
You can use an XmlAdapter to customize how a date type is written to XML.

import java.text.SimpleDateFormat;
import java.util.Date;

import javax.xml.bind.annotation.adapters.XmlAdapter;

public class DateAdapter extends XmlAdapter<String, Date> {

    private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    @Override
    public String marshal(Date v) throws Exception {
        return dateFormat.format(v);
    }

    @Override
    public Date unmarshal(String v) throws Exception {
        return dateFormat.parse(v);
    }

}

Then you use the @XmlJavaTypeAdapter annotation to specify that the XmlAdapter should be used for a specific field/property.

@XmlElement(name = "timestamp", required = true) 
@XmlJavaTypeAdapter(DateAdapter.class)
protected Date timestamp;