Here you can find the source of evaluate(String path, Node node)
public static synchronized String evaluate(String path, Node node) throws RuntimeException
//package com.java2s; /*//w w w . jav a 2 s . c o m * Copyright 2017 Andrey Timofeev. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import javax.xml.xpath.XPath; import javax.xml.xpath.XPathExpression; import javax.xml.xpath.XPathFactory; import org.w3c.dom.Node; public class Main { public static synchronized String evaluate(String path, Node node) throws RuntimeException { path = path.trim(); try { XPath xp = XPathFactory.newInstance().newXPath(); XPathExpression expr = xp.compile(path); String ret = expr.evaluate(node); return ret; } catch (Exception ex) { throw new RuntimeException(ex); } } }