Java设置XStream反序列化规则

我有一个类，它带有codeBased

enum

字段。我有这个类的xml序列化对象。但是，当我尝试使用

XStream

反序列化此xml时，我收到：

com.thoughtworks.xstream.converters.ConversionException:无枚举常量com.functest.util.TriState.0:无枚举常量com.functest.util.TriState.0

阶级

xmlParameters字符串

<Params>
    <clientCode>1516001</clientCode>
    <triState>0</triState>
</Params>

我尝试像这样反序列化xml：

XStream xStream = new XStream();
xStream.alias("triState", TriState.class);
Params p = (Params) xStream.fromXML(xmlParameters);

---

如何设置反序列化规则以从xml获取值并调用枚举方法

fromCode（0）

？

将fromCode转换为静态方法：

public enum TriState {
    YES(1),NO(0),UNDEFINED(-1);
    int code;
    private TriState(int code) {
        this.code = code;
    }
    public static TriState fromCode(int code) {
        if (code == 1)
            return YES;
        if (code == 0)
            return NO;
        return UNDEFINED;
    }
}

并定义使用静态方法将代码转换为有效枚举的转换器：

public class TriStateConverter implements Converter {
    public boolean canConvert(Class type) {
        return TriState.class==type;
    }
    public void marshal(Object o, HierarchicalStreamWriter writer, MarshallingContext mc) {
        writer.setValue(Integer.toString(((TriState)o).code));
    }
    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext uc) {
        return TriState.fromCode(Integer.parseInt(reader.getValue()));
    }
}

我还没有试过这个代码，但应该可以用

public enum TriState {
    YES(1),NO(0),UNDEFINED(-1);
    int code;
    private TriState(int code) {
        this.code = code;
    }
    public static TriState fromCode(int code) {
        if (code == 1)
            return YES;
        if (code == 0)
            return NO;
        return UNDEFINED;
    }
}

public class TriStateConverter implements Converter {
    public boolean canConvert(Class type) {
        return TriState.class==type;
    }
    public void marshal(Object o, HierarchicalStreamWriter writer, MarshallingContext mc) {
        writer.setValue(Integer.toString(((TriState)o).code));
    }
    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext uc) {
        return TriState.fromCode(Integer.parseInt(reader.getValue()));
    }
}