使用 Xstream 反序列化

Question

下面是我的java类

public class CRM
{

    private String phone[];
    private String email;
    public String[] getPhone()
    {
            return phone;
    }

    public void setPhone(String[] phone)
    {
            this.phone = phone;
    }

    public String getEmail()
    {
            return email;
    }

    public void setEmail(String email)
    {
            this.email = email;
    }

}

下面是我的 XML。

<Crm>
    <Phone>123456789</Phone>
    <email>a@a.com</email>
</Crm>

以下是我得到的堆栈跟踪：

Exception in thread "main" com.thoughtworks.xstream.converters.ConversionException:     array element type mismatch : array element type mismatch
---- Debugging information ----
message             : array element type mismatch
cause-exception     : java.lang.IllegalArgumentException
cause-message       : array element type mismatch
class               : [Ljava.lang.String;
required-type       : [Ljava.lang.String;
converter-type      : com.thoughtworks.xstream.converters.collections.ArrayConverter
path                : /crm/phone
line number         : 4
class[1]            : com.CRM
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:1052)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1036)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:912)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:903)
at com.Parser.main(Parser.java:29)
Caused by: java.lang.IllegalArgumentException: array element type mismatch
at java.lang.reflect.Array.set(Native Method)
at com.thoughtworks.xstream.converters.collections.ArrayConverter.unmarshal(ArrayConverter.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
... 16 more

我是否遗漏了什么或做了什么根本错误的事情？

我正在使用 xstream-1.4.2.jar 和 Java 1.6。

我会一直尝试将 xmls 转换为 java 对象。

Answer 1

没有看到用于实例化 XStream 的代码，我不能 100% 确定，但问题似乎是因为在 XML 中，您提供了一个字符串，而 xstream 需要一个字符串数组。

一个简单的解决方法是将 xml 文件更改为以下行：

<Crm>
    <phone>
        <string>123456789</string>
    </phone>
    <email>a@a.com</email>
 </Crm>

另一种选择是调整 xstream 并定义一个implicit array，并为String 类定义一个alias：

XStream xstream = new XStream();
xstream.alias("Crm", CRM.class);
xstream.addImplicitArray(CRM.class, "phone");
xstream.alias("phone", String.class);

这将能够将以下 XML 解析为 CRM 实例：

<Crm>
    <phone>12345</phone>
    <phone>123456</phone>
    <phone>12345678</phone>
    <email>a@a.com</email>
</Crm>