java – 我可以使用SimpleXML来解析结构未知的XML吗？

我使用SimpleXML来解析通信协议中使用的小型XML文件.这一切都很好,但现在我正在实现协议的一部分,其中包括一种自由格式的XML.

例如,像这样的XML：

<telegram>
  <config>
    <foo>yes</foo>
    <bar>no</bar>
  </config>
</telegram>

foo和bar将来可能会发生变化,或者可能会添加一个元素baz,而无需触及解析代码.我想使用类似的结构在Java中访问这些元素

tree.getConfig().get("bar");   // returns "no"

我可以使用SimpleXML来解析它吗？我查看了文档,但找不到我需要的东西.

解决方法:

Can I use SimpleXML to parse that?

不是开箱即用 – 但写一个Converter就可以了.

@Root(name = "telegram")
@Convert(Telegram.TelegramConverter.class) // Requires AnnotationStrategy
public class Telegram
{
    private Map<String, String> config;


    public String get(String name)
    {
        return config.get(name);
    }

    public Map<String, String> getConfig()
    {
        return config;
    }

    // ...

    @Override
    public String toString()
    {
        return "Telegram{" + "config=" + config + '}';
    }




    static class TelegramConverter implements Converter<Telegram>
    {
        @Override
        public Telegram read(InputNode node) throws Exception
        {
            Telegram t = new Telegram();

            final InputNode config = node.getNext("config");
            t.config = new HashMap<>();

            // Iterate over config's child nodes and put them into the map
            InputNode cfg = config.getNext();

            while( cfg != null )
            {
                t.config.put(cfg.getName(), cfg.getValue());
                cfg = config.getNext();
            }

            return t;
        }

        @Override
        public void write(OutputNode node, Telegram value) throws Exception
        {
            // Implement if you need serialization too
            throw new UnsupportedOperationException("Not supported yet.");
        }

    }
}

用法：

final String xml = "<telegram>\n"
        + "  <config>\n"
        + "    <foo>yes</foo>\n"
        + "    <bar>no</bar>\n"
        + "    <baz>maybe</baz>\n" // Some "future element"
        + "  </config>\n"
        + "</telegram>";
/*
 * The AnnotationStrategy is set here since it's
 * necessary for the @Convert annotation
 */
Serializer ser = new Persister(new AnnotationStrategy());
Telegram t = ser.read(Telegram.class, xml);

System.out.println(t);

结果：

Telegram{config={bar=no, foo=yes, baz=maybe}}

标签：java,android,xml,simple-framework
来源： https://codeday.me/bug/20190702/1359657.html