1

我有一个这样的xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<ClOrdIDS><ClOrdID id="1"><Account>1005390</Account><Symbol>SAP</Symbol><SecurityID>4663789</SecurityID><SecurityExchange>XETR</SecurityExchange><Price>23.0</Price><Order_Type>Limit</Order_Type><Side>SELL</Side><Order_Quantity>0.001</Order_Quantity></ClOrdID><ClOrdID id="2"><Account>1005390</Account><Symbol>SAP</Symbol><SecurityID>4663789</SecurityID><SecurityExchange>XETR</SecurityExchange><Price>13.0</Price><Order_Type>Limit</Order_Type><Side>SELL</Side><Order_Quantity>0.001</Order_Quantity></ClOrdID><ClOrdID id="3"><Account>1005390</Account><Symbol>SAP</Symbol><SecurityID>4663789</SecurityID><SecurityExchange>XETR</SecurityExchange><Price>13.0</Price><Order_Type>Limit</Order_Type><Side>BUY</Side><Order_Quantity>0.001</Order_Quantity></ClOrdID><ClOrdID id="4"><Account>1005390</Account><Symbol>SAP</Symbol><SecurityID>4663789</SecurityID><SecurityExchange>XETR</SecurityExchange><Price>13.0</Price><Order_Type>Limit</Order_Type><Side>BUY</Side><Order_Quantity>0.001</Order_Quantity></ClOrdID><ClOrdID id="5"><Account>1005390</Account><Symbol>SAP</Symbol><SecurityID>4663789</SecurityID><SecurityExchange>XETR</SecurityExchange><Price>13.0</Price><Order_Type>Limit</Order_Type><Side>BUY</Side><Order_Quantity>0.001</Order_Quantity></ClOrdID><ClOrdID id="6"><Account>1005390</Account><Symbol>SAP</Symbol><SecurityID>4663789</SecurityID><SecurityExchange>XETR</SecurityExchange><Price>13.0</Price><Order_Type>Limit</Order_Type><Side>BUY</Side><Order_Quantity>0.001</Order_Quantity></ClOrdID><ClOrdID id="7"><Account>1005390</Account><Symbol>SAP</Symbol><SecurityID>4663789</SecurityID><SecurityExchange>XETR</SecurityExchange><Price>13.0</Price><Order_Type>Limit</Order_Type><Side>SELL</Side><Order_Quantity>0.001</Order_Quantity></ClOrdID></ClOrdIDS>

如何使用 ClOrdID id="3" 提取 child 的元素？

谢谢

4

3 回答 3

2

你可以这样做

String xmlString = ... 
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document doc = docBuilder.parse(xmlString);

XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
String xpathExp = "/ClOrdIDS/ClOrdID[@id=\"3\"]";
NodeList childNodeList = (NodeList) xpath.evaluate(xpathExp, doc, XPathConstants.NODESET);
于 2014-04-01T16:48:38.840 回答
1

由于问题上的标签是 JDOM，而不是 DOM，因此您可以改用 JDOM ;-)：

Document doc = new SaxBuilder().build(xmlFile);
XPathExpression<Element> xpe = XPathFactory.instance()
          .compile("/ClOrdIDS/ClOrdID[@id=\"3\"]", Filters.element());
List<Element> idThrees = xpe.evaluate(doc);
于 2014-04-01T17:32:17.480 回答
0

这是在VTD-XML中执行此操作的代码...

import com.ximpleware.*;


public class removeElement {
    public static void main(String s[]) throws VTDException{
        VTDGen vg = new VTDGen();
        if (!vg.parseFile("input.xml", false))
            return;
        VTDNav vn = vg.getNav();
        AutoPilot ap = new AutoPilot(vn);
        ap.selectXPath("/ClOrdIDS/ClOrdID[@id='3']");
        int i=0;
        while((i=ap.evalXPath())!=-1){

        }
    }
}
于 2016-03-27T00:31:25.117 回答