XStream在将类转换为XML

public static String tran(WorkItem item){XStream xstream = new XStream();xstream.setMode(XStream.NO_REFERENCES);xstream.alias("workitem", WorkItem.class);return xstream.toXML(item);}public static String tranJson(WorkItem item){XStream xstream = new XStream(new JsonHierarchicalStreamDriver());xstream.setMode(XStream.NO_REFERENCES);xstream.alias("workitem", WorkItem.class);return xstream.toXML(item);}