Comment convertir une Liste d'Objet de document XML à l'aide de XStream

Vous n'avez pas nécessairement besoin d'un CustomConverter.

Vous avez besoin d'une classe afin de conserver votre liste:

public class PersonList {

    private List<Person> list;

    public PersonList(){
        list = new ArrayList<Person>();
    }

    public void add(Person p){
        list.add(p);
    }
}

À serialise la liste XML:

    XStream xstream = new XStream();
    xstream.alias("person", Person.class);
    xstream.alias("persons", PersonList.class);
    xstream.addImplicitCollection(PersonList.class, "list");

    PersonList list = new PersonList();
    list.add(new Person("ABC",12,"address"));
    list.add(new Person("XYZ",20,"address2"));

    String xml = xstream.toXML(list);

À deserialise xml à une liste d'objets de la personne:

    String xml = "<persons><person>...</person></persons>";
    PersonList pList = (PersonList)xstream.fromXML(xml);

OriginalL'auteur dogbane

Charger le fichier XML

public static Object Load(String xmlPath) throws Exception
{
    File FileIn = new File(xmlPath);
    if(FileIn.exists()) {
        //Initialise Doc
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document Doc = builder.parse(FileIn);

        //Initialise XPath
        XPathFactory xPathFactory = XPathFactory.newInstance();
        XPath xpath = xPathFactory.newXPath();

        String objectClassLocation = xpath.evaluate("/object/@class",Doc);
        Object ObjType;

        //Create List of attributes for the Student
        XPathExpression xpathExpression = xpath.compile("/object/*");
        NodeList ObjTypeAttributes = (NodeList)xpathExpression.evaluate(Doc, XPathConstants.NODESET);

        ObjType = CreateObject(ObjTypeAttributes, objectClassLocation);
        return ObjType;
    }
    return null;
}

Créer Un Objet

public static Object CreateObject(NodeList ObjectAttributes, String Location) throws Exception
{
    Class ClassName = Class.forName(Location);
    Object object = ClassName.newInstance();
    Field[] fields = ClassName.getFields();

    for(int x = 0; x < fields.length;x++)
    {
        for(int y = 0; y<ObjectAttributes.getLength(); y++)
        {
            if(!(ObjectAttributes.item(y) instanceof Text)) {
                String check = ObjectAttributes.item(y).getAttributes().item(0).getNodeValue();

                if(fields[x].getName().equals(check))
                {
                    Field curField = ClassName.getField(fields[x].getName());
                    if(ObjectAttributes.item(y).getAttributes().getLength() < 2) {

                        curField.set(object,CreateList(ObjectAttributes.item(y).getChildNodes()));
                    }
                    else {

                        curField.set(object,ObjectAttributes.item(y).getAttributes().item(1).getNodeValue());
                    }

                }

            }
        }

    }
    return object;

}

Créer une liste (Uniquement utilisé si xml est un objet d'objets)

public static ArrayList CreateList(NodeList ArrayNodeList) throws Exception
{
    ArrayList List = new ArrayList();

    for(int x = 0; x < ArrayNodeList.getLength();x++)
    {
        if(!(ArrayNodeList.item(x) instanceof Text)) {
            Node curNode = ArrayNodeList.item(x);

            NodeList att = curNode.getChildNodes();
            String Location = ArrayNodeList.item(x).getAttributes().item(0).getNodeValue();
            Object newOne = CreateObject(att, Location);
            List.add(newOne);

        }
    }
    return List;
}

XML exemple, j'ai utilisé

    <?xml version="1.0" encoding="UTF-8"?>
<object class="Example.Rps">
<field name="Representatives">
<object class="Example.Rep">
<field name="RepID" value="888225462"/>
<field name="Surname" value="Johnson"/>
<field name="Name" value="Dave"/>
<field name="Clients">
<object class="Example.Client">
<field name="ClientName" value="Cipla"/>
<field name="State" value="New York"/>
<field name="grade" value="A"/>
</object>
<object class="Example.Client">
<field name="ClientName" value="Pharmco"/>
<field name="State" value="Iowa"/>
<field name="grade" value="B"/>
</object>
</field>
</object>
<object class="Example.Rep">
<field name="RepID" value="888225462"/>
<field name="Surname" value="Dickson"/>
<field name="Name" value="Ben"/>
<field name="Clients">
<object class="Example.Client">
<field name="ClientName" value="XYZ"/>
<field name="State" value="New Mexico"/>
<field name="grade" value="A"/>
</object>
<object class="Example.Client">
<field name="ClientName" value="Pharmco"/>
<field name="State" value="Ohio"/>
<field name="grade" value="c"/>
</object>
</field>
</object>
</field>
</object>

OriginalL'auteur Boiling Epsilon