dom创建xml文件报“java.lang.IllegalStateException: Root element not set”

来源：互联网发布：淘宝助理获取订单编辑：程序博客网时间：2024/06/06 14:20

错误如下：

错误代码如下：

doc = XmlUtil.CreateDocument();if(doc == null) return "";    root = doc.createElement("transaction");  //创建根元素    doc.setXmlVersion("1.0");            root.setAttribute("xmlns", "http://www.cebbank.com/wangshangyh/ebankToBiz");    root.setAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");    root.setAttribute("xsi:schemaLocation", "http://www.cebbank.com/wangshangyh/ebankToBiz schema_v0.5.5.xsd");    Element transfer = XmlUtil.appendChild("balance", root, doc);     Element transferResponse = XmlUtil.appendChild("balanceRespond", transfer, doc);    Element transferResponseHeader = XmlUtil.appendChild("balanceRespondHeader", transferResponse, doc);    XmlUtil.appendChild("language", getLanguage(), transferResponseHeader, doc);    XmlUtil.appendChild("respondTime", getResponseTime(), transferResponseHeader, doc);Element responseStatus = XmlUtil.appendChild("respondStatus", transferResponseHeader, doc);XmlUtil.appendChild("respondCode", getResponseStatus().getResponseCode(), responseStatus, doc);XmlUtil.appendChild("respondInfo", getResponseStatus().getResponseInfo(), responseStatus, doc);XmlUtil.appendChild("userID", getUserID(), transferResponseHeader, doc);XmlUtil.appendChild("batchID", getBatchID(), transferResponseHeader, doc);XmlUtil.appendChild("transPatches", getTransPatches(), transferResponseHeader, doc);

原因：创建的根元素没有指定到doc文件里，所以程序没有把元素和doc联系在一起。

改正代码如下：

doc = XmlUtil.CreateDocument();if(doc == null) return "";    root = doc.createElement("transaction");  //创建根元素    doc.appendChild(root);    //把根元素与doc联系起来    doc.setXmlVersion("1.0");            root.setAttribute("xmlns", "http://www.cebbank.com/wangshangyh/ebankToBiz");    root.setAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");    root.setAttribute("xsi:schemaLocation", "http://www.cebbank.com/wangshangyh/ebankToBiz schema_v0.5.5.xsd");    Element transfer = XmlUtil.appendChild("balance", root, doc);     Element transferResponse = XmlUtil.appendChild("balanceRespond", transfer, doc);    Element transferResponseHeader = XmlUtil.appendChild("balanceRespondHeader", transferResponse, doc);    XmlUtil.appendChild("language", getLanguage(), transferResponseHeader, doc);    XmlUtil.appendChild("respondTime", getResponseTime(), transferResponseHeader, doc);Element responseStatus = XmlUtil.appendChild("respondStatus", transferResponseHeader, doc);XmlUtil.appendChild("respondCode", getResponseStatus().getResponseCode(), responseStatus, doc);XmlUtil.appendChild("respondInfo", getResponseStatus().getResponseInfo(), responseStatus, doc);XmlUtil.appendChild("userID", getUserID(), transferResponseHeader, doc);XmlUtil.appendChild("batchID", getBatchID(), transferResponseHeader, doc);XmlUtil.appendChild("transPatches", getTransPatches(), transferResponseHeader, doc);