不使用Annotation的Java代码到XML/XSD

Question

我需要将Java类编组并解组为XML.该类不属于我,我无法添加anotations以便我可以使用JAXB.

有没有一种很好的方法将Java转换为具有给定约束的XML？

此外,认为一个工具可能会有所帮助,但我会更有兴趣它有一些Java API来做同样的事情.

Answer 1

注意: 我是EclipseLink JAXB(MOXy)的负责人,也是JAXB(JSR-222)专家组的成员.

域模型

我将使用以下域模型来获得此答案.请注意模型上没有JAXB注释.

顾客

package forum11693552;

import java.util.*;

public class Customer {

    private String firstName;
    private String lastName;
    private List<PhoneNumber> phoneNumbers = new ArrayList<PhoneNumber>();

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public List<PhoneNumber> getPhoneNumbers() {
        return phoneNumbers;
    }

    public void setPhoneNumbers(List<PhoneNumber> phoneNumbers) {
        this.phoneNumbers = phoneNumbers;
    }

}

电话号码

package forum11693552;

public class PhoneNumber {

    private String type;
    private String number;

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

}

选项#1 - 任何JAXB(JSR-222)实现

JAXB是例外configurartion,这意味着你只需要添加你想要的映射行为从默认的不同注解.下面是一个示例的链接,演示如何使用任何没有注释的JAXB impl:

演示

package forum11693552;

import javax.xml.bind.*;
import javax.xml.namespace.QName;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Customer.class);

        Customer customer = new Customer();
        customer.setFirstName("Jane");
        customer.setLastName("Doe");

        PhoneNumber workPhone = new PhoneNumber();
        workPhone.setType("work");
        workPhone.setNumber("555-1111");
        customer.getPhoneNumbers().add(workPhone);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        JAXBElement<Customer> rootElement = new JAXBElement<Customer>(new QName("customer"), Customer.class, customer);
        marshaller.marshal(rootElement, System.out);
    }

}

产量

<customer>
    <firstName>Jane</firstName>
    <lastName>Doe</lastName>
    <phoneNumbers>
        <number>555-1111</number>
        <type>work</type>
    </phoneNumbers>
</customer>

欲获得更多信息

• http://wiki.eclipse.org/EclipseLink/Examples/MOXy/GettingStarted/TheBasics

选项#2 - EclipseLink JAXB(MOXy)的外部映射文档

如果您确实想要自定义映射,那么您可能对MOXy的外部映射文档扩展感兴趣.示例映射文档如下所示:

oxm.xml

<?xml version="1.0"?>
<xml-bindings xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"
    package-name="forum11693552">
    <java-types>
        <java-type name="Customer">
            <xml-root-element />
            <java-attributes>
                <xml-element java-attribute="firstName" name="first-name" />
                <xml-element java-attribute="lastName" name="last-name" />
                <xml-element java-attribute="phoneNumbers" name="phone-number" />
            </java-attributes>
        </java-type>
        <java-type name="PhoneNumber">
            <java-attributes>
                <xml-attribute java-attribute="type" />
                <xml-value java-attribute="number" />
            </java-attributes>
        </java-type>
    </java-types>
</xml-bindings>

jaxb.properties

要将MOXy作为JAXB提供程序启用,您需要jaxb.properties在与域模型相同的程序包中包含一个调用的文件,并带有以下条目(请参阅:http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as -your.html):

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory

演示

当使用的EclipseLink莫西为您的JAXB提供者(见),您可以在引导利用外部映射文件的 JAXBContext

package forum11693552;

import java.util.*;
import javax.xml.bind.*;
import javax.xml.namespace.QName;
import org.eclipse.persistence.jaxb.JAXBContextFactory;

public class Demo {

    public static void main(String[] args) throws Exception {
        Map<String, Object> properties = new HashMap<String,Object>(1);
        properties.put(JAXBContextFactory.ECLIPSELINK_OXM_XML_KEY, "forum11693552/oxm.xml");
        JAXBContext jc = JAXBContext.newInstance(new Class[] {Customer.class}, properties);

        Customer customer = new Customer();
        customer.setFirstName("Jane");
        customer.setLastName("Doe");

        PhoneNumber workPhone = new PhoneNumber();
        workPhone.setType("work");
        workPhone.setNumber("555-1111");
        customer.getPhoneNumbers().add(workPhone);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        JAXBElement<Customer> rootElement = new JAXBElement<Customer>(new QName("customer"), Customer.class, customer);
        marshaller.marshal(rootElement, System.out);
    }

}

产量

<?xml version="1.0" encoding="UTF-8"?>
<customer>
   <first-name>Jane</first-name>
   <last-name>Doe</last-name>
   <phone-number type="work">555-1111</phone-number>
</customer>

欲获得更多信息

• http://blog.bdoughan.com/2010/12/extending-jaxb-representing-annotations.html
• http://blog.bdoughan.com/2012/04/extending-jaxb-representing-metadata-as.html

Answer 2

你看过XStream吗？它将对没有注释或XSD的标准POJO进行反序列化/反序列化.您可以提供自定义以影响元素在XML中的显示方式,并且几乎可以开箱即用.