XStream上用于XML转换的等效DROP_ROOT_MODE

Question

public static String entityToXML(GenericResponseObject entity) {
    XStream xstream = new XStream(new StaxDriver());

    xstream.autodetectAnnotations(true);
    xstream.registerConverter(new GenericResponseAttributeConverter());
    String xml = xstream.toXML(entity);

    return xml;
}

@XStreamAlias("objectResult")
public class GenericResponseObject {

    @XStreamAlias("attributes")
    @XStreamImplicit
    private ArrayList<GenericResponseAttribute> attributes;

    public GenericResponseObject() {
        this.attributes = new ArrayList();
    }

    public void addAttribute(String name, Object value) {
        this.attributes.add(new GenericResponseAttribute(name, value));
    }
}

类GenericResponseAttribute：

@XStreamAlias("attribute")
public class GenericResponseAttribute {

    private String name;
    private Object value;

    public GenericResponseAttribute(String name, Object value) {
        this.name = name;
        this.value = value;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Object getValue() {
        return this.value;
    }

    public void setValue(Object value) {
        this.value = value;
    }
}

正如您所读到的，每个类都有用于别名和隐式列表的XStream注释，因此，让我向您展示我为GenericResponseAttribute类制作的自定义转换器：

public class GenericResponseAttributeConverter implements Converter {

    @Override
    public boolean canConvert(Class type) {
        return type.equals(GenericResponseAttribute.class);
    }

    @Override
    public void marshal(Object o, HierarchicalStreamWriter writer, MarshallingContext mc) {
        GenericResponseAttribute value = (GenericResponseAttribute)o;
        writer.startNode(value.getName());
        mc.convertAnother(value.getValue());
        writer.endNode();
    }

    @Override
    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext uc) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
}

因此，如果我在运行时构建一个GenericResponseObject，并用静态方法将其解析为XML，K将得到如下内容：

response = new GenericResponseObject();
response.addAttribute("user", "alex");
response.addAttribute("otherAtt", "TEST");
System.out.println(XMLUtil.entityToXML(response));

<objectResult>
    <attribute>
        <user>hugo</user>
    </attribute>
    <attribute>
        <otherAtt>TEST</otherAtt>
    </attribute>
</objectResult>

<objectResult>
    <user>hugo</user>
    <otherAtt>TEST</otherAtt>
</objectResult>

我的需求是非常基本的，但我不知道如何满足它，我搜索了一下，在HierarchicalStreamWriter类中似乎没有像deletRootNode（）或replaceRootNode（）这样的方法，而且在GenericResponseAttribute中也没有可以使用的@XStreamNoOot或@XStreamMakeRoot注释，所以，这就是为什么我在这里询问的原因，如果您知道如何做到这一点，请帮助我。

多谢了。

Answer 1

当我在将对象解析为XML后使用字符串替换时，我的意思是：

public static String entityToXML(Object entity) {
    XStream xstream = new XStream(new StaxDriver());

    xstream.autodetectAnnotations(true);
    xstream.registerConverter(new GenericResponseAttributeConverter());
    String xml = xstream.toXML(entity);

    xml = xml.replace("<attribute>", "");
    xml = xml.replace("</attribute>", "");

    return xml;
}

但是，这不是一个很酷的解决方案，如果你有另一个请告诉我。

多谢了。