JAXB 和属性排序

我希望 Java 类的序列化 XML 输出符合 Java 类中属性的顺序。

JAXB 似乎是按字母顺序排序的。

我可以通过使用 @XmlType和 保持秩序并指定所有属性来覆盖它，但是我有一个具有许多属性的类，而且这些属性还没有最终确定。

我读到指定一个空的 保持秩序可以做到这一点，但它没有。

我的示例类:

package test;


import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;


@XmlRootElement
//@XmlType(propOrder={"company", "scheme", "agreementNumber"})
@XmlType(propOrder={}) // makes no difference - still alphabetical in XML
public class CustomerPlan2 {


private String company;
private String scheme;
private String agreementNumber;


@XmlElement(name="Company")
public String getCompany() {
return company;
}
public void setCompany(String company) {
this.company = company;
}


@XmlElement(name="Scheme")
public String getScheme() {
return scheme;
}
public void setScheme(String scheme) {
this.scheme = scheme;
}


@XmlElement(name="AgreementNumber")
public String getAgreementNumber() {
return agreementNumber;
}
public void setAgreementNumber(String agreementNumber) {
this.agreementNumber = agreementNumber;
}
}

我的序列化代码:

    CustomerPlan2 cp2 = new CustomerPlan2();


cp2.setCompany("company");
cp2.setScheme("scheme");
cp2.setAgreementNumber("agreementnumber");
JAXBContext context = JAXBContext.newInstance(CustomerPlan2.class);
Marshaller marshaller = context.createMarshaller();


marshaller.marshal(cp2, new FileWriter("C:\\temp\\out.xml"));

产出:

    <customerPlan2>
<AgreementNumber>agreementnumber</AgreementNumber>
<Company>company</Company>
<Scheme>scheme</Scheme>
</customerPlan2>

我希望我的输出是(作为类的属性顺序) :

    <customerPlan2>
<Company>company</Company>
<Scheme>scheme</Scheme>
<AgreementNumber>agreementnumber</AgreementNumber>
</customerPlan2>

谢谢你的帮助。