Java XPath Get getStringByXPath(String xml, String xpathStr)

Description

Get a string by XPATH from a xml file

License

Apache License

Parameter

Parameter	Description
xml	a parameter
xpathStr	a parameter

Declaration

public static String getStringByXPath(String xml, String xpathStr) 

Method Source Code

//package com.java2s;
/**************************************************************
 * // w w  w .j  a v a  2s . c  o  m
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 java.io.File;

import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;

public class Main {
    /**
     * Get a string by XPATH from a xml file
     * 
     * @param xml
     * @param xpathStr
     * @return
     */
    public static String getStringByXPath(String xml, String xpathStr) {
        Document doc = parseXML(xml);
        if (doc == null)
            return null;

        try {
            XPathFactory factory = XPathFactory.newInstance();
            XPath xpath = factory.newXPath();
            XPathExpression expr = xpath.compile(xpathStr);
            return (String) expr.evaluate(doc);
        } catch (XPathExpressionException e) {
            e.printStackTrace();
            return null;
        }

    }

    /**
     * Parse XML file to Document model
     * 
     * @param path
     * @return
     */
    public static Document parseXML(String path) {
        try {
            DocumentBuilderFactory dbfac = DocumentBuilderFactory.newInstance();
            dbfac.setNamespaceAware(true);
            DocumentBuilder docBuilder = dbfac.newDocumentBuilder();
            return docBuilder.parse(new File(path));
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static Document parseXML(InputStream inputStream) {
        try {
            DocumentBuilderFactory dbfac = DocumentBuilderFactory.newInstance();
            dbfac.setNamespaceAware(true);
            DocumentBuilder docBuilder = dbfac.newDocumentBuilder();
            return docBuilder.parse(inputStream);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

Related

1. getSpeficValueFromNode(Node n, String xpathExpr)
2. getStrFromNode(Node xpathnode)
3. getStrFromNode(Node xpathnode)
4. getString(final String xPath, final Object item)
5. getString(Node node, XPathExpression expr)
6. getStringValue(Node node, XPathExpression expression)
7. getStringValue(Object doc, XPathExpression path)
8. getStringValue(String targetDoc, String xpathExp, String encoding)
9. getStringValueByXPath(Node node, String xPath)