java - JAXB 父类(super class)字段未反序列化

Question

我正在尝试将 xml 字符串反序列化为对象，但遇到了奇怪的问题。一切都按预期序列化，但是当反序列化源自父类的字段时始终返回 null。

MyNffgDescriptor 是一个包含 VNFTypeReader 作为属性的类。所有字段都正确反序列化，VNFTypeReader 字段除外，从父类 (NamedEntityReaderImpl) 传递的 name 除外，它返回 null。

父类

package it.polito.dp2.NFV.sol3.client1.implementations;

import java.io.Serializable;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;

import it.polito.dp2.NFV.NamedEntityReader;


@XmlAccessorType(XmlAccessType.NONE)
public class NamedEntityReaderImpl implements NamedEntityReader, Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private String entityName;

    public NamedEntityReaderImpl() {
        this.entityName = "";
    }

    public NamedEntityReaderImpl(String name) {
        this.entityName = name;
    }

    @Override
    public String getName() {
        return this.entityName;
    }

}

子类

    package it.polito.dp2.NFV.sol3.client1.implementations;

import java.io.Serializable;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

import it.polito.dp2.NFV.VNFTypeReader;

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class VNFTypeReaderImpl extends NamedEntityReaderImpl implements Serializable,VNFTypeReader {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @XmlElement
    private int requiredMemory;

    @XmlElement
    private int requiredStorage;

    @XmlElement
    private it.polito.dp2.NFV.FunctionalType funcType;

    public VNFTypeReaderImpl() {
        super(null);
        this.requiredMemory = 0;
        this.requiredStorage = 0;
        this.funcType = null;
    }

    public VNFTypeReaderImpl(VNFTypeReader reader) {
        super(reader.getName());
        this.requiredMemory = reader.getRequiredMemory();
        this.requiredStorage = reader.getRequiredStorage();
        this.funcType = reader.getFunctionalType();
    }

    @Override
    public int getRequiredMemory() {
        return this.requiredMemory;
    }

    @Override
    public int getRequiredStorage() {
        return this.requiredStorage;
    }

    @Override
    public it.polito.dp2.NFV.FunctionalType getFunctionalType() {
        return this.funcType;
    }

    @Override
    @XmlElement(name="name", required=true)
    public String getName() {
        return super.getName();
    }

}

这是我尝试反序列化的 xml 字符串示例:

<?xml version="1.0" encoding="UTF-8"?>
<myNffgDescriptor>
   <nodeList id="0">
      <funcReader>
         <requiredMemory>620</requiredMemory>
         <requiredStorage>100</requiredStorage>
         <funcType>WEB_SERVER</funcType>
         <name>WEBSERVERt</name>
      </funcReader>
      <hostName>H3</hostName>
      <linksList source="0" destination="10" />
      <linksList source="0" destination="11" />
      <linksList source="0" destination="8" />
   </nodeList>
</myNffgDescriptor>

解码发生的位置:

    jaxbContext = JAXBContext.newInstance(MyNffgDescriptor.class);
    unmarshaller = jaxbContext.createUnmarshaller();
    StringReader reader = new StringReader(nffg);
    MyNffgDescriptor nffgDesc = (MyNffgDescriptor) unmarshaller.unmarshal(reader);

Answer 1

将父级上的 XmlAccessType.NONE 更改为 XmlAccessType.FIELD 类 NamedEntityReaderImpl。

您还可以在类 NamedEntityReaderImpl 字段上方添加注释:

@XmlElement(name= "name")
private String entityName;

进行其中一项更改(或同时进行两项更改)，它就会起作用