解决XStream注解同名冲突

多个类注解@XStreamAlias,value相同、且在集合上使用了@XStreamImplicit会出现异常：com.thoughtworks.xstream.converters.ConversionException:Nofield'null'foundinclass'.....(注解的类路径)'----Debugginginformation----message:Nofield'null'foundinclass'.....'cause-exception:com.thoughtwo