Java Xstream错误地将列表项解释为另一个列表项的一部分
我正在尝试使用Xstream读取XML文件。我遇到的一个奇怪的问题是,当我创建一个用户列表时,它会正确地读取第一个用户,但它会尝试将第二个用户存储为第一个用户的成员变量!我有一个XML文件:Java Xstream错误地将列表项解释为另一个列表项的一部分,java,list,xstream,Java,List,Xstream,我正在尝试使用Xstream读取XML文件。我遇到的一个奇怪的问题是,当我创建一个用户列表时,它会正确地读取第一个用户,但它会尝试将第二个用户存储为第一个用户的成员变量!我有一个XML文件: <data> <users> <user> <username>test1</username> <password>test1</password>
<data>
<users>
<user>
<username>test1</username>
<password>test1</password>
<firstname>Test</firstname>
<lastname>One</lastname>
<email>test1@gmail.com</email>
<indexedrecords>0</indexedrecords>
</user>
<user>
<username>test2</username>
<password>test2</password>
<firstname>Test</firstname>
<lastname>Two</lastname>
<email>test2@gmail.com</email>
<indexedrecords>0</indexedrecords>
</user>
</users>
.... There are other tags here, but they're not causing an issue (yet).
</data>
还有班级本身。型号:
@XStreamAlias("data")
public class Model {
@XStreamImplicit
public static List<User> users;
//Other stuff
}
exeption(请原谅[java]
-它正在使用ANT运行):
为什么Xstream试图将第二个用户
作为变量存储在第一个用户
中
答案编辑:有两个问题,这两个问题都在Michael的答案中得到了解决
1) 我暗示了一个隐式集合(两次!),我不应该这样做,因为XML显式声明了一个users
列表
2) 我在
模型
类中的变量是静态的。尚不清楚这导致错误的原因,但它确实导致了错误。用户列表之前的@XStreamImplicit
注释告诉XStream,XML将不具有标记调用用户,而是所有名为user的标记都应存储在用户列表中
从XML中删除用户
,或者从变量声明中删除@XStreamImplicit
注释
其他变化
您还需要删除对xstream.addImplicitCollection(Model.class,“users”,User.class)的调用因为这与@XStreamImplicit
类似
修复隐式后遇到的另一个问题是模型类中的users变量被声明为静态的。因为它是静态的,所以不被视为序列化的一部分。那个XML示例正确吗?它似乎试图用“/user”(不带“s”)关闭开头的“users”标记。不,抱歉,真正的XML是正确的。我将更新帖子。XML超出了我的控制范围-它是在外部创建的。删除@XStreamImplicit会导致线程“main”com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$UnknownFieldException中出现新的错误-异常:没有这样的字段indexer.shared.model.model.users
。这让我很困惑,因为模型
中该列表的名称正是用户
。更正:删除添加的mplicitcollection
(或同时删除两者)完成了我上面提到的操作。删除@XStreamImplicit
会引发与问题本身相同的错误。感谢您的解释。根本问题是隐式集合和变量是静态的。虽然它们最好是静态的,但我可以修复它,使它们不是静态的。谢谢(顺便说一句,谢谢你的语法正确!)
@XStreamAlias("data")
public class Model {
@XStreamImplicit
public static List<User> users;
//Other stuff
}
@XStreamAlias("user")
public class User implements ModelItem{
private String username;
private String password;
@XStreamAlias("firstname")
private String firstName;
@XStreamAlias("lastname")
private String lastName;
private String email;
@XStreamAlias("indexedrecords")
private int recordsIndexed;
}
[java] Exception in thread "main" com.thoughtworks.xstream.converters.ConversionException: Element user of type shared.model.User is not defined as field in type shared.model.User
[java] ---- Debugging information ----
[java] class : shared.model.User
[java] required-type : shared.model.User
[java] converter-type : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
[java] path : /data/users/user
[java] line number : 19
[java] class[1] : indexer.shared.model.Model
[java] version : null
[java] -------------------------------
[java] at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.writeValueToImplicitCollection(AbstractReflectionConverter.java:403)
[java] at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:334)
[java] at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234)
[java] at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
[java] at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
[java] at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
[java] at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
[java] at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:322)
[java] at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234)
[java] at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
[java] at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
[java] at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
[java] at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
[java] at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
[java] at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
[java] at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1052)
[java] at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1036)
[java] at com.thoughtworks.xstream.XStream.fromXML(XStream.java:912)
[java] at com.thoughtworks.xstream.XStream.fromXML(XStream.java:903)
[java] at importer.Importer.importXml(Importer.java:77)
[java] at importer.Importer.main(Importer.java:45)