Java 使用 XStream 读取 XML
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时间：2020-08-12 00:06:57 来源:igfitidea点击:
Java Reading XML with XStream
提问by user2686811
I'm trying to deserialize this XML file using XStream and I'm getting this error
我正在尝试使用 XStream 反序列化此 XML 文件，但出现此错误
Exception in thread "main" com.thoughtworks.xstream.converters.ConversionException: Authors : Authors
---- Debugging information ----
message : Authors
cause-exception : com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message : Authors
class : java.util.ArrayList
required-type : java.util.ArrayList
converter-type : com.thoughtworks.xstream.converters.collections.CollectionConverter
path : /ListOfDBook/DBook/Authors
class[1] : com.test.books.ListOfDBook
converter-type[1] : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
version : null
-------------------------------
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:355)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:306)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234)
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:1058)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1042)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:922)
at com.test.booktest.BookImport.getBooks(BookImport.java:34)
at com.test.booktest.Client.main(Client.java:6)
Caused by: com.thoughtworks.xstream.mapper.CannotResolveClassException: Authors
at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:56)
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:79)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:72)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:66)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.unmarshal(CollectionConverter.java:61)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
... 16 more
With this XML
有了这个 XML
<ListOfDBook xmlns="Test.Books" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<DBook>
<Authors>
<DAuthor>
<Name>Google</Name>
<Url>http://google.com</Url>
</DAuthor>
</Authors>
</DBook>
</ListOfDBook>
With these classes
有了这些课
//ListOfDBook.java
public class ListOfDBook {
public ArrayList<DBook> DBook;
}
//DBook.java
public class DBook {
public ArrayList<DAuthor> Authors;
}
//DAuthor.java
public class DAuthor {
String Name;
String Url;
}
//BookImport.java
import com.test.books.*;
XStream xstream = new XStream(new DomDriver());
xstream.alias("ListOfDBook", ListOfDBook.class);
InputStream in = new FileInputStream("Books.xml");
ListOfDBook = (ListOfDBook)xstream.fromXML(in);
I recreated the classes from reading the XML file and changing the XML file is not an option. Am I doing something completely wrong?
我通过读取 XML 文件重新创建了类，更改 XML 文件不是一个选项。我做错了什么吗？
采纳答案by jn1kk
You are missing Authors?
你缺少作者吗？
//ListOfDBook.java
public class ListOfDBook {
public ArrayList<DBook> DBook;
}
//DBook.java
public class DBook {
public ArrayList<Author> Authors;
}
//Author.java
public class Author {
public ArrayList<DAuthor> DAuthors;
}
//DAuthor.java
public class DAuthor {
String Name;
String Url;
}
EDIT 2:
编辑2：
You need to use addImplicitCollection.
您需要使用addImplicitCollection.
import java.util.*;
import com.thoughtworks.xstream.*;
import com.thoughtworks.xstream.io.*;
import com.thoughtworks.xstream.io.xml.*;
import java.io.*;
public class Test {
public static void main(String[] args) throws Exception {
XStream xstream = new XStream(new DomDriver());
xstream.alias("ListOfDBook", ListOfDBook.class);
xstream.alias("DBook", DBook.class);
xstream.alias("Authors", Authors.class);
xstream.alias("DAuthor", DAuthor.class);
xstream.addImplicitCollection(Authors.class, "dauthors");
xstream.addImplicitCollection(DBook.class, "authors");
xstream.addImplicitCollection(ListOfDBook.class, "dbooks");
InputStream in = new FileInputStream("Books.xml");
ListOfDBook var = (ListOfDBook)xstream.fromXML(in);
}
}
//ListOfDBook.java
class ListOfDBook {
public List<DBook> dbooks = new LinkedList<DBook>();
}
//DBook.java
class DBook {
public List<Authors> authors = new LinkedList<Authors>();
}
//Authors.java
class Authors {
public List<DAuthor> dauthors = new LinkedList<DAuthor>();
}
//DAuthor.java
class DAuthor {
public String Name;
public String Url;
}
