[英]Servlet Unable to Fetch the updated value from XML
在 Java Web 项目中,我们使用 Servlet 使用来自网页的值更新 XML 标记值,然后为了进一步执行,Servlet 必须从 XML 获取更新的标记值并继续,但它正在检索旧值(在更新之前)并继续。
public void setPeriodID(String bookingsBOPeriodID) throws InterruptedException {
try{
final String FilePath=UtilLib.getEnvVar("ConfigXMLFilePath");
String filepath = FilePath;
String bwperiodid=" and ";
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document doc = docBuilder.parse(filepath);
// Get the staff element by tag name directly
Node Parameters = doc.getElementsByTagName("Parameters").item(0);
// loop the staff child node
NodeList list = Parameters.getChildNodes();
for (int i = 0; i < list.getLength(); i++) {
Node node = list.item(i);
//BookingsBO
if (bookingsBOPeriodID!=null && bookingsBOPeriodID.length()!=0 && "BookingsBOINPeriodId".equals(node.getNodeName()) && bookingsBOPeriodID.indexOf(bwperiodid)==-1 ){
System.out.println("***** Updating Bookings BO IN Period id ********");
System.out.println("inside updateEnvPeriodID::"+bookingsBOPeriodID);
node.setTextContent(bookingsBOPeriodID);
// node.setNodeValue(bookingsBOPeriodID);
}
}
// write the content into xml file
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(new File(filepath));
transformer.transform(source, result);
System.out.println("******* Period Id details updated **************");
} catch (ParserConfigurationException pce) {
pce.printStackTrace();
} catch (TransformerException tfe) {
tfe.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
} catch (SAXException sae) {
sae.printStackTrace();
}
System.out.println("in period id after update :"+ UtilLib.getParam("BookingsBOINPeriodId"));
}
来自 webinterface 的新值通过 "bookingsBOPeriodID" 传递。 在此方法之后,新值未立即反映在 XML 中
在从 xml 读取数据之前,让您的代码等待一段时间。 您应该为此类操作同步您的资源和进程。
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