xml序列化Java对象

Question

让我知道序列化Java对象下载的最佳方法。这是一个由java wsimport工具从WSDL生成的类

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "Download", propOrder = {
    "Response",
    "VendorInformation",
    "DownloadItem",
    "DownloadCommentItem",
    "DownloadIntercomItem"
})

public class Download 
{

    @XmlElement(name = "Response")
    protected ResponseMessageManagementType Response;
    @XmlElement(name = "VendorInformation")
    protected DownloadVendorInformation VendorInformation;
    @XmlElement(name = "DownloadItem")
    protected List<DownloadDownloadItem> DownloadItem;
    @XmlElement(name = "DownloadCommentItem")
    protected ArrayOfDownloadDldComment DownloadCommentItem;
    @XmlElement(name = "DownloadIntercomItem")
    protected ArrayOfDownloadDldIntercom DownloadIntercomItem;

    .........................
}

该工具生成的java类没有任何serlization实现。 我想按照这种格式序列化下载类：

<?xml version="1.0" encoding="utf-8"?>
<Download xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns="HTTP://xyz.abc.Com//Vendor/DownloadWSE.xsd">
  <Response>
   .....
  </Response>

  <VendorInformation>
   ...............
  </VendorInformation>

  <DownloadItem>
    <DownloadDownloadItem>
       .......
    </DownloadDownloadItem>
    <DownloadDownloadItem>
       .......
    </DownloadDownloadItem>
    <DownloadDownloadItem>
       .......
    </DownloadDownloadItem>
  </DownloadItem>
  <DownloadCommentItem>
    ........
  </DownloadCommentItem>
  <DownloadIntercomItem>
    ........
  </DownloadIntercomItem>
</Download>

您可以看到XmlElementName和XML字符串内容之间的映射。 我不知道该怎么做

谢谢

Answer 1

这是JAXB，为了让示例正常运行，您需要提供根元素和名称空间信息：

根元素

使用JAXB封送对象时，需要有关根元素的信息。一种方法是用@XmlRootElement注释Download类

@XmlRootElement(name="Download")
public class Download 

如果不能这样做，则需要将Download的实例包装在JAXBElement中：

Download download = new Download();
QName qname = new QName("HTTP://xyz.abc.Com//Vendor/DownloadWSE.xsd";
JAXBElement<Download> jaxbElement = new JAXBElement(qname, "Download"), Download.class, download);

名称空间限定

另外，要获得名称空间限定，可以使用包级别@XmlSchema注释：

@XmlSchema(
    namespace="HTTP://xyz.abc.Com//Vendor/DownloadWSE.xsd", 
    elementFormDefault=XmlNsForm.QUALIFIED)
package your.model.package.containing.download;

import javax.xml.bind.annotation.*;

演示

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.Marshaller;
import javax.xml.namespace.QName;

public class Demo {

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

        Download download = new Download();
        QName qname = new QName("HTTP://xyz.abc.Com//Vendor/DownloadWSE.xsd";
        JAXBElement<Download> jaxbElement = new JAXBElement(qname, "Download"), Download.class, download);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(jaxbElement, System.out);
    }
}