[英]Parsing XML having list of objects into javaobject using Xstream
我想使用Xstream将XML转换为Java对象。 以下是我的实现方式。
我有一个XML,看起来像:
<CWATSR>
<ATSP>
<Keys>spacekey1</Keys>
<Keys>spacekey2</Keys>
<Keys>spacekey3</Keys>
<STATM>
<entry>
<key>Test1</key>
<value>Test1value</value>
</entry>
<entry>
<key>Test2</key>
<value>Test2value</value>
</entry>
<entry>
<key>ITest3</key>
<value>Test3Value</value>
</entry>
</STATM>
</ATSP>
<ATSP>
<Keys>spacekey11</Keys>
<Keys>spacekey22</Keys>
<Keys>spacekey33</Keys>
<STATM>
<entry>
<key>Test1</key>
<value>Test1value1</value>
</entry>
<entry>
<key>Test2</key>
<value>Test2value2</value>
</entry>
<entry>
<key>ITest3</key>
<value>Test3Value3</value>
</entry>
</STATM>
</ATSP>
</CWATSR>
我有2个Java对象,要使用Xstream转换上述XML:
CWATST.class
@XStreamAlias("CWATSR")
public class CWATSR {
@XStreamImplicit
private List<ATSP> atsp;
//Getters and setters
}
WrappedReflectingDefinition.class
@XStreamAlias("ATSP")
public class ATSP implements Serializable {
@XStreamImplicit(itemFieldName = "Keys")
@XmlElement(name = "Keys")
private List<String> Keys;
@XStreamAlias("STATM")
private Map<String, String> STATM;
// Getters and setters
}
我的Xstream代码是(主体是上述XML):
xstream.processAnnotations(CWATSR .class);
xstream.processAnnotations(ATSP.class);
CWATSR cwatsr = (CWATSR ) xstream.fromXML(body);
我得到以下异常:
Exception in thread "main" com.thoughtworks.xstream.converters.ConversionException: Keys:Keys
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:464)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:396)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:247)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1156)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1140)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1011)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1002)
at com.iit.package.delete.main(delete.java:53)
Caused by: com.thoughtworks.xstream.mapper.CannotResolveClassException: Keys
at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:79)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:45)
at com.thoughtworks.xstream.core.util.HierarchicalStreams.readClassType(HierarchicalStreams.java:29)
at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:70)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.addCurrentElementToCollection(CollectionConverter.java:98)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:91)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:85)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.unmarshal(CollectionConverter.java:80)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
... 16 more
问题是Map
ATSP#STATM
。 您尝试反序列化
<entry>
<key>Test1</key>
<value>Test1value</value>
</entry>
但是通过您的配置,您的xml必须具有以下格式:
<entry>
<string>Test1</string>
<string>Test1value</string>
</entry>
如果要直接使用xml,请向其注册一个NamedMapConverter 。
final String entryName = "entry";
final String keyName = "key";
final Class<String> keyType = String.class;
final String valueName = "value";
final Class<String> valueType = String.class;
NamedMapConverter statmConverter = new NamedMapConverter(
xstream.getMapper(), entryName, keyName, keyType, valueName,
valueType);
xstream.registerLocalConverter(ATSP.class, "STATM", statmConverter);
编辑:使用注释而不是以编程方式注册转换器更容易
@XStreamAlias("STATM")
@XStreamConverter(value = NamedMapConverter.class, strings = { "entry",
"key", "value" }, types = { String.class, String.class })
Map<String, String> STATM;
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