SimpleXML,org.simpleframework.xml.core.PersistenceException

Question

经过很多挫折之后,我来到这里寻求帮助.我正在使用org.simpleframework.xml来解析Android中的RSS提要.我尝试解析xml文件时收到以下错误:

org.simpleframework.xml.core.PersistenceException: Element 'link' is already used with @org.simpleframework.xml.Element(data=false, name=, required=true, type=void) on field 'link'

这是我试图解析的xml示例:

<?xml version="1.0" encoding="utf-8" ?>
<rss version="2.0" xml:base="http://www.somelink.com/" xmlns:atom="http://www.w3.org/2005/Atom">
    <channel>
        <title>My Title</title>
        <description>Latest breaking news, sport, weather and opinion, from South Africa, Africa and the world.</description>
        <link>http://www.somelink.com/</link>
        <atom:link rel="self" href="http://www.someotherlink.com" />
    </channel>
</rss>

这些是我在代码中使用的类和注释:

@Root(name = "rss")
@Namespace(reference = "http://www.w3.org/2005/Atom", prefix = "atom")
public class NewsFeed
{
    @Version(revision = 2.0)
    private float version;

    @Attribute
    private String base;

    @Element
    private Channel channel;
}

@Root(name = "channel")
public class Channel
{
    @Element
    private String title;

    @Element
    private String description;

    @Element
    private String link;

    @Element
    @Namespace(reference = "http://www.w3.org/2005/Atom", prefix = "atom")
    private Link rssLink;

    @ElementList(inline = true)
    private List<NewsItem> newsItems;
}

@Root(name = "link")
public class Link
{
    @Attribute
    private String rel;

    @Attribute
    private String href;

    public String getRel()
    {
        return rel;
    }

    public void setRel(String rel)
    {
        this.rel = rel;
    }

    public String getHref()
    {
        return href;
    }

    public void setHref(String href)
    {
        this.href = href;
    }
}

我创建了Link类,以便我可以使用atom命名空间.正如您从错误中看到的那样,库似乎没有将命名空间考虑在内,这就是为什么它抱怨已经使用了link元素的原因.我究竟做错了什么？非常感谢您的帮助.

Answer 1

我面临着同样的问题，即使在不同的命名空间中，它似乎link也atom:link被视为相同的条目，并且它们需要合并到一个List<Link> rssLink 列表中。

这是我用于解析 rss feed 的 kotlin 模型代码，它工作正常：

@Root(name = "rss", strict = false)
data class RssFeed(
    @field:Element(name = "channel")
    var channel: RssChannel = RssChannel()
)

@NamespaceList(
    Namespace(prefix = "atom", reference = "http://www.w3.org/2005/Atom")
)
@Root(name = "channel", strict = false)
data class RssChannel(
    @field:Element var title: String = "",
    @field:Element var description: String = "",
    @field:Element var generator: String = "",
    @field:Element var lastBuildDate: String = "",

    @field:ElementList(entry = "link", required = false, inline = true)
    var links: List<RssLink> = ArrayList(),

    @field:ElementList(inline = true)
    var items: List<RssItem> = ArrayList()
)

@Root(name = "item", strict = false)
data class RssItem(
    @field:Element
    var title: String = "",

    @field:Element
    var pubDate: String = "",

    @field:Element
    var link: String = "",

    @field:Element(required = false)
    var description: String = "",

    @field:Element
    var guid: String = ""
)

@Root(name = "link", strict = false)
data class RssLink(
    // for <link>http://www.somelink.com/</link>
    @field:Text(required = false) var text: String = "",

    // for <atom:link rel="self" href="http://www.someotherlink.com" />
    @field:Attribute(required = false) var rel: String = "",
    @field:Attribute(required = false, name = "type") var contentType: String = "",
    @field:Attribute(required = false) var href: String = ""
)

您也可以在这里查看