Java XML Node Text Value getText(Node node)

Description

get Text

License

Apache License

Declaration

public static String getText(Node node) throws IOException 

Method Source Code

//package com.java2s;
/* ************************************************************************** *
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership./*from  ww  w . j av  a2 s . c  o m*/
 *
 * This file is licensed 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.IOException;

import java.io.OutputStream;
import java.io.OutputStreamWriter;

import java.io.StringWriter;
import java.io.Writer;

import org.w3c.dom.Attr;
import org.w3c.dom.DOMConfiguration;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import org.w3c.dom.Text;
import org.w3c.dom.bootstrap.DOMImplementationRegistry;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSOutput;
import org.w3c.dom.ls.LSSerializer;

public class Main {
    public static String getText(Node node) throws IOException {
        StringWriter writer = new StringWriter();
        if (!serializeXmlNode(node, writer, false)) {
            return null;
        }
        return writer.toString();
    }

    private static boolean serializeXmlNode(Node node, Writer writer, boolean includeNode) throws IOException {
        if (node == null) {
            return false;
        }
        short type = node.getNodeType();
        boolean result = true;
        switch (type) {
        case Node.ATTRIBUTE_NODE: {
            String text = ((Attr) node).getValue();
            writer.write(text);
            break;
        }
        case Node.TEXT_NODE: {
            String text = ((Text) node).getData();
            writer.write(text);
            break;
        }
        case Node.ELEMENT_NODE: {
            Element element = (Element) node;
            if (includeNode) {
                serializeXML(element, writer, false);
            } else {
                Node child = element.getFirstChild();
                while (child != null) {
                    serializeXmlNode(child, writer, true);
                    child = child.getNextSibling();
                }
            }
            break;
        }
        case Node.DOCUMENT_NODE: {
            Document doc = (Document) node;
            serializeXmlNode(doc.getDocumentElement(), writer, includeNode);
            break;
        }
        default:
            result = false;
            break;
        }
        return result;
    }

    /**
     * @param doc
     * @param out
     * @throws IOException
     */
    public static void serializeXML(Document doc, OutputStream out) throws IOException {
        serializeXML(doc.getDocumentElement(), out);
    }

    public static void serializeXML(Document doc, Writer writer) throws IOException {
        serializeXML(doc.getDocumentElement(), writer, true);
    }

    public static void serializeXML(Document doc, Writer writer, boolean addXmlDeclaration) throws IOException {
        serializeXML(doc.getDocumentElement(), writer, addXmlDeclaration);
    }

    public static void serializeXML(Element doc, OutputStream out) throws IOException {
        Writer writer = new OutputStreamWriter(out, "UTF-8");
        serializeXML(doc, writer, true);
    }

    private static void serializeXML(Element doc, Writer writer, boolean addXmlDeclaration) throws IOException {
        try {
            DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();
            DOMImplementationLS impl = (DOMImplementationLS) registry.getDOMImplementation("LS");
            LSSerializer serializer = impl.createLSSerializer();
            DOMConfiguration config = serializer.getDomConfig();
            config.setParameter("xml-declaration", addXmlDeclaration);
            // config.setParameter("format-pretty-print", true);
            // config.setParameter("normalize-characters", true);
            LSOutput out = impl.createLSOutput();
            out.setCharacterStream(writer);
            serializer.write(doc, out);
        } catch (Throwable e) {
            throw new IOException(e.getMessage());
        }
    }

    public static String serializeXML(Node node) throws IOException {
        StringWriter writer = new StringWriter();
        if (!serializeXmlNode(node, writer, true)) {
            return null;
        }
        return writer.toString();
    }
}

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