Question

我有一个输入xml和相应的java类，如下所示。

<Address>
  <name>name</name>
  <streetName>street</streetName>
<Address>

public class Address {
    private String name;
    //getter and setter here
}

public class Home extends Address {
    private String streetName;
    // getter and setter follows
}

我试图像下面的

那样解组xml

import com.thoughtworks.xstream.XStream;

public class Main {
    public static void main(String as[]) {
        XStream xstream = new XStream();
        String str = "<com.xstream.inheritance.Address> <name>name</name> <streetName>street</streetName>"
                + "</com.xstream.inheritance.Address>";
        Address address1 = (Address) xstream.fromXML(str);
        System.out.println(address1.getName());
    }
}

我有一个例外说线程“main”中的异常

com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$UnknownFieldException: No such field com.xstream.inheritance.Address.streetName
---- Debugging information ----
field               : streetName
class               : com.xstream.inheritance.Address
required-type       : com.xstream.inheritance.Address
converter-type      : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
path                : /com.xstream.inheritance.Address/streetName
version             : null

为什么我得到这个例外？

Answer 1

XML缺少指向扩展类的“class”属性。所以输出将是这样的：

<com.xstream.inheritance.Address class="com.xstream.inheritance.Home">
 <name>name</name>
 <streetName>street</streetName>
</com.xstream.inheritance.Address>

这是由XStream自动完成的。

Answer 2

假设您的bean位于包＆＃34; com.xstream.inheritance＆＃34;中，如果您从

更改xml的根标记，则您的Main类运行良好

<com.xstream.inheritance.Address>

到

<com.xstream.inheritance.Home>

这是必要的，因为streetName字段仅在Home中可用，而不在Address中。另请注意，fromXml（）返回的是Home实例，而不仅仅是Address。

Xstream中的继承问题

2 个答案: