get Text Value by XPath - Java XML

Java examples for XML:XPath

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Description

get Text Value by XPath

Demo Code


import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.CDATASection;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class Main{
    /*from w w  w.  j a  v  a  2 s .c  o m*/
    public static String getTextValue(Document doc, String nodeXpath) {
        Node node = findNodeByXpath(doc, nodeXpath);
        if (node != null) {
            return node.getTextContent();
        }

        return null;
    }
    public static Node findNodeByXpath(Document doc, String xpath) {
        NodeList nodelist = findNodeListByXpath(doc, xpath);
        if (nodelist.getLength() > 0) {
            return nodelist.item(0);
        }
        return null;
    }
    public static NodeList findNodeListByXpath(Document doc, String xpath) {
        XPathFactory pathFactory = XPathFactory.newInstance();
        //??XPathFactory???? XPath ??  
        XPath x_path = pathFactory.newXPath();
        //??XPath????XPath????  
        Object obj = null;
        try {
            XPathExpression pathExpression = x_path.compile(xpath);
            obj = pathExpression.evaluate(doc, XPathConstants.NODESET);
        } catch (Exception ex) {
            ex.printStackTrace();
            throw new RuntimeException("Error while xpath search");
        }
        NodeList nodelist = (NodeList) obj;

        return nodelist;
    }
    public static List<Node> findNodeListByXpath(Document doc,
            String xpath, NodeType nodeType) {
        XPathFactory pathFactory = XPathFactory.newInstance();
        //??XPathFactory???? XPath ??  
        XPath x_path = pathFactory.newXPath();
        //??XPath????XPath????  
        Object obj = null;
        try {
            XPathExpression pathExpression = x_path.compile(xpath);
            obj = pathExpression.evaluate(doc, XPathConstants.NODESET);
        } catch (Exception ex) {
            ex.printStackTrace();
            throw new RuntimeException("Error while xpath search");
        }
        NodeList nodelist = (NodeList) obj;

        List<Node> nlist = new ArrayList<Node>();
        for (int i = 0; i < nodelist.getLength(); i++) {
            Node n = nodelist.item(i);
            if (isNodeTypeMatches(n, nodeType)) {
                nlist.add(n);
            }
        }

        return nlist;
    }
    public static boolean isNodeTypeMatches(Node node, NodeType nodeType) {
        return ((int) node.getNodeType()) == nodeType.getValue();
    }
}

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