将XML转换为Java映射<；字符串，整数>；使用XStream

我正在使用XStream将XML转换为Java映射。每次我解决一个问题，就会遇到另一个问题。令人难以置信的沮丧。无论如何，XML看起来是这样的：

<?xml version="1.0" encoding="UTF-8" ?>
    <root>
        <Durapipe type="int">1</Durapipe>
        <EXPLAIN type="int">2</EXPLAIN>
        <woods type="int">2</woods>
        <hanging type="int">3</hanging>
        <hastily type="int">2</hastily>
        <localized type="int">1</localized>
        <Schuster type="int">5</Schuster>
        ....
    </root>

XStream xstream = new XStream();
    Map<String, Integer> englishCorpusProbDist; 
    xstream.registerConverter(new MapEntryConverter());
    englishCorpusProbDist = (Map<String, Integer>)xstream.fromXML(new File("locationOnMyComputer/frequencies.xml"));

public class MapEntryConverter implements Converter {
  public class java {

    }

public boolean canConvert(Class clazz) {
    return Map.class.isAssignableFrom(clazz);
  }

  public void marshal(Object value, HierarchicalStreamWriter writer, MarshallingContext context) {
    Map<String, Integer> map = (Map<String, Integer>) value;
    for (Map.Entry<String, Integer> entry : map.entrySet()) {
      writer.startNode(entry.getKey().toString());
      writer.setValue(entry.getValue().toString());
      writer.endNode();
    }
  }

  public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
    Map<String, Integer> map = new HashMap<String, Integer>();

    while (reader.hasMoreChildren()) {
      reader.moveDown();
      map.put(reader.getNodeName(), new Integer(reader.getValue()));
      reader.moveUp();
    }
    return map;
  }
}

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5.
....

我在main中用于实现此功能的Java如下所示：

<?xml version="1.0" encoding="UTF-8" ?>
    <root>
        <Durapipe type="int">1</Durapipe>
        <EXPLAIN type="int">2</EXPLAIN>
        <woods type="int">2</woods>
        <hanging type="int">3</hanging>
        <hastily type="int">2</hastily>
        <localized type="int">1</localized>
        <Schuster type="int">5</Schuster>
        ....
    </root>

XStream xstream = new XStream();
    Map<String, Integer> englishCorpusProbDist; 
    xstream.registerConverter(new MapEntryConverter());
    englishCorpusProbDist = (Map<String, Integer>)xstream.fromXML(new File("locationOnMyComputer/frequencies.xml"));

public class MapEntryConverter implements Converter {
  public class java {

    }

public boolean canConvert(Class clazz) {
    return Map.class.isAssignableFrom(clazz);
  }

  public void marshal(Object value, HierarchicalStreamWriter writer, MarshallingContext context) {
    Map<String, Integer> map = (Map<String, Integer>) value;
    for (Map.Entry<String, Integer> entry : map.entrySet()) {
      writer.startNode(entry.getKey().toString());
      writer.setValue(entry.getValue().toString());
      writer.endNode();
    }
  }

  public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
    Map<String, Integer> map = new HashMap<String, Integer>();

    while (reader.hasMoreChildren()) {
      reader.moveDown();
      map.put(reader.getNodeName(), new Integer(reader.getValue()));
      reader.moveUp();
    }
    return map;
  }
}

XStream XStream=newxstream（）；
地图英文版；
registerConverter（新的MapEntryConverter（））；
englishCorpusProbDist=（Map）xstream.fromXML（新文件（“locationOnMyComputer/frequencies.xml”）；

我创建的MapEntryConverter类如下所示：

<?xml version="1.0" encoding="UTF-8" ?>
    <root>
        <Durapipe type="int">1</Durapipe>
        <EXPLAIN type="int">2</EXPLAIN>
        <woods type="int">2</woods>
        <hanging type="int">3</hanging>
        <hastily type="int">2</hastily>
        <localized type="int">1</localized>
        <Schuster type="int">5</Schuster>
        ....
    </root>

XStream xstream = new XStream();
    Map<String, Integer> englishCorpusProbDist; 
    xstream.registerConverter(new MapEntryConverter());
    englishCorpusProbDist = (Map<String, Integer>)xstream.fromXML(new File("locationOnMyComputer/frequencies.xml"));

public class MapEntryConverter implements Converter {
  public class java {

    }

public boolean canConvert(Class clazz) {
    return Map.class.isAssignableFrom(clazz);
  }

  public void marshal(Object value, HierarchicalStreamWriter writer, MarshallingContext context) {
    Map<String, Integer> map = (Map<String, Integer>) value;
    for (Map.Entry<String, Integer> entry : map.entrySet()) {
      writer.startNode(entry.getKey().toString());
      writer.setValue(entry.getValue().toString());
      writer.endNode();
    }
  }

  public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
    Map<String, Integer> map = new HashMap<String, Integer>();

    while (reader.hasMoreChildren()) {
      reader.moveDown();
      map.put(reader.getNodeName(), new Integer(reader.getValue()));
      reader.moveUp();
    }
    return map;
  }
}

公共类MapEntryConverter实现转换器{
公共类java{
}
公共布尔canConvert（类clazz）{
返回Map.class.isAssignableFrom（clazz）；
}
公共无效封送处理（对象值、HierarchycalStreamWriter编写器、封送上下文）{
Map=（Map）值；
对于（Map.Entry:Map.entrySet（））{
writer.startNode（entry.getKey（）.toString（））；
writer.setValue（entry.getValue（）.toString（））；
writer.endNode（）；
}
}
公共对象解组（HierarchycalStreamReader读取器，解组上下文）{
Map Map=newhashmap（）；
while（reader.hasMoreChildren（））{
reader.moveDown（）；
put（reader.getNodeName（），新整数（reader.getValue（））；
reader.moveUp（）；
}
返回图；
}
}

目前我得到以下异常：“线程中的异常”main“com.thoughtworks.xstream.mapper.CannotResolveClassException:root”

有人能解释一下为什么会这样，我怎样才能解决这个问题吗

这个问题似乎有答案，但我认为我们正在使用不同的实现：

任何帮助都将不胜感激。提前谢谢

试试这个：

XStream xstream = new XStream(new DomDriver());
        xstream.alias("root", Map.class);
        Map<String, Integer> englishCorpusProbDist; 
        xstream.registerConverter(new MapEntryConverter());
        englishCorpusProbDist = (Map<String, Integer>)xstream.fromXML(new FileInputStream(new File("locationOnMyComputer/frequencies.xml")));

XStream XStream=newxstream（newdomdriver（））；
别名（“根”，Map.class）；
地图英文版；
registerConverter（新的MapEntryConverter（））；
englishCorpusProbDist=（Map）xstream.fromXML（新文件inputStream（新文件（“locationOnMyComputer/frequencies.xml”））；

好的。这似乎效果更好。如果我收到一个异常，它说，“[Fatal Error]frequencies.xml:1:27582:元素类型“key”后面必须跟属性规范“>”或“/>”，这很可能意味着我的xml代码中有错误，对吗？是的，这是xml文件中的错误，可能没有按照xml文件中的预期格式格式化