XStream解析xml为bean时，避免xml出现多余字段报错

示例代码：

return new XStream() {
@Override
protected MapperWrapper wrapMapper(MapperWrapper next){
return new MapperWrapper(next) {
@Override
public boolean shouldSerializeMember(Class definedIn, String fieldName){
if (definedIn == Object.class){
try {
return this.realClass(fieldName) != null;
} catch (Exception e){
return false;
}
} else {
return super.shouldSerializeMember(definedIn, fieldName);
}
}
};
}
};