Java如何在JAXB中定义XML元素顺序？
在此代码段中，您将学习如何定义JAXBAPI生成的XML元素的顺序。要定义元素顺序，我们需要@XmlType在POJO中使用注释。在此注释propOrder中，我们定义了哪个元素应该首先出现，哪个元素应该放在最后。
由生成的XMLmarshaller下面将具有以下顺序：street，city，province，zipCode和country作为最后的XML元素。
package org.nhooo.example.jaxb;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
@XmlRootElement(name = "customerAddress")
@XmlType(propOrder = {"street", "city", "province", "zipCode", "country"})
public class Address {
private String street;
private String city;
private String province;
private String country;
private String zipCode;
@XmlElement
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
@XmlElement
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
@XmlElement
public String getProvince() {
return province;
}
public void setProvince(String province) {
this.province = province;
}
@XmlElement
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
@XmlElement(name = "postCode")
public String getZipCode() {
return zipCode;
}
public void setZipCode(String zipCode) {
this.zipCode = zipCode;
}
@Override
public String toString() {
return "Address{" +
"street='" + street + ''' +
", city='" + city + ''' +
", province='" + province + ''' +
", country='" + country + ''' +
", zipCode='" + zipCode + ''' +
'}';
}
}现在，让我们创建一个程序来运行AddressPOJO的编组过程，以将其转换为XML文档：
package org.nhooo.example.jaxb;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
public class JAXBElementOrder {
public static void main(String[] args) {
Address address = new Address();
address.setStreet("Sunset Road");
address.setCity("Denpasar");
address.setProvince("Bali");
address.setCountry("Indonesia");
address.setZipCode("800000");
try {
JAXBContext context = JAXBContext.newInstance(Address.class);
Marshaller marshaller = context.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
marshaller.marshal(address, System.out);
} catch (JAXBException e) {
e.printStackTrace();
}
}
}它将为您提供以下输出：
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<customerAddress>
<street>Sunset Road</street>
<city>Denpasar</city>
<province>Bali</province>
<country>Indonesia</country>
<postCode>800000</postCode>
</customerAddress>