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() {@Overrideprotected MapperWrapper wrapMapper(MapperWrapper next){return new MapperWrapper(next) {@Overridepublic 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);}}};}};