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IT168技术文档】
也可以注释具体的类Company和Individual来定制映射。首先作为XML文档的根元素，不得不使用@XmlRootElement注释来指定XML命名空间
http://www.watermelon.example/customer。该例子中使用@XmlType.propOrder来定制属性。可以使用从超类Customer中继承像id,email,telephone,homeAddress等。
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Annotated Company Class
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Annotated Individual Class
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@XmlRootElement(name = "company", namespace=
"http://www.watermelon.example/customer")
@XmlType(propOrder = {"id", "name", "contactName",
"telephone", "email", "numberOfEmployees",
"homeAddress", "deliveryAddresses"})
@XmlAccessorType(XmlAccessType.FIELD)
public class Company extends Customer {
@XmlAttribute
private String name;
private String contactName;
private Integer numberOfEmployees;
// Constructors, getters, setters
}
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@XmlRootElement(name = "individual", namespace =
"http://www.watermelon.example/customer")
@XmlType(propOrder = {"id", "lastname",
"firstname", "dateOfBirth", "telephone",
"email", "homeAddress",
"deliveryAddresses"})
@XmlAccessorType(XmlAccessType.FIELD)
public class Individual extends Customer {
private String firstname;
@XmlAttribute
private String lastname;
@XmlJavaTypeAdapter(DateAdapter.class)
private Date dateOfBirth;
// Constructors, getters, setters
}
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JAXB映射java.util.Date属性为默认值，例如，个体的出生日期将显示为下列格式：<dateOfBirth>1940-08-07T00:00:00.781+02:00</dateOfBirth>
为了格式化日期（如：07/08/1953），有两种选择：
1． 使用日期类型javax.xml.datatype.XMLGregorianCalendar而不使用java.util.Date。
2． 使用一个适配器，就像上面代码看到的那样，个体类Individual使用@XmlJavaTypeAdapter注释。@XmlJavaTypeAdapter(DateAdapter.class)通知JAXB使用适配器调用DateAdapter当marshalling/unmarshalling属性dateOfBirth时。
写一个类（DateAdapter）来继承XmlAdapter。覆盖marshal 和 unmarshal方法。这种方法可以将日期按照一定格式的字符串进行格式化，反之亦然。下列代码使用java.text.SimpleDateFormat来格式化日期：
public class DateAdapter extends XmlAdapter<String, Date> ...{
DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
public Date unmarshal(String date) throws Exception ...{
return df.parse(date);
}
public String marshal(Date date) throws Exception ...{
return df.format(date);
}
}
现在返回Listing 1，如果Marshaller.marshal()方法被调用，DateAdapter.marshal()也被调用，出生日期也被格式化了.下面是获得的XML文档：
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Individual XML Document
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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns2:individual lastname="Starr" id="1" xmlns:ns2="http://www.watermelon.example/customer">
<firstname>Ringo</firstname>
<dateOfBirth>07/08/1940</dateOfBirth>
<telephone>+187445</telephone>
<email>ringo@star.co.uk</email>
<homeAddress>
<street>Abbey Road</street>
<zip>SW14</zip>
<city>London</city>
<country>UK</country>
</homeAddress>
<delivery>
<address>
<street>Findsbury Avenue</street>
<zip>CE451</zip>
<city>London</city>
<country>UK</country>
</address>
<address>
<street>Camden Street</street>
<zip>NW487</zip>
<city>Brighton</city>
<country>UK</country>
</address>
</delivery>
</ns2:individual>
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Company XML Document
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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns2:company name="Sony" id="1" xmlns:ns2="http://www.watermelon.example/customer">
<contactName>Mr Father</contactName>
<telephone>+14519454</telephone>
<email>contact@sony.com</email>
<numberOfEmployees>25000</numberOfEmployees>
<homeAddress>
<street>General Alley</street>
<zip>75011</zip>
<city>Paris</city>
<country>FR</country>
</homeAddress>
<delivery>
<address>
<street>St James St</street>
<zip>SW14</zip>
<city>London</city>
<country>UK</country>
</address>
<address>
<street>Central Side Park</street>
<zip>7845</zip>
<city>New York</city>
<country>US</country>
</address>
</delivery>
</ns2:company>
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