Serializes the given DOM node using #writeNode(Node,Writer) and returns the XML as a String.

Description

Demo Code

/*//from  w  w  w . j ava 2s .c  om

   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.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.w3c.dom.Attr;
import org.w3c.dom.DOMException;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class Main{
    /**
     * Serializes the given DOM node using {@link #writeNode(Node,Writer)}
     * and returns the XML as a String.
     *
     * @param n The Node to serialize.
     * @return A String containing the XML serialization of the Node, or an
     *   empty String if there was a problem during serialization.
     */
    public static String getXML(Node n) {
        Writer writer = new StringWriter();
        try {
            DOMUtilities.writeNode(n, writer);
            writer.close();
        } catch (IOException ex) {
            return "";
        }
        return writer.toString();
    }
    /**
     * Writes a node using the given writer.
     */
    public static void writeNode(Node n, Writer w) throws IOException {
        switch (n.getNodeType()) {
        case Node.ELEMENT_NODE:
            w.write("<");
            w.write(n.getNodeName());

            if (n.hasAttributes()) {
                NamedNodeMap attr = n.getAttributes();
                int len = attr.getLength();
                for (int i = 0; i < len; i++) {
                    Attr a = (Attr) attr.item(i);
                    w.write(" ");
                    w.write(a.getNodeName());
                    w.write("=\"");
                    w.write(contentToString(a.getNodeValue()));
                    w.write("\"");
                }
            }

            Node c = n.getFirstChild();
            if (c != null) {
                w.write(">");
                for (; c != null; c = c.getNextSibling()) {
                    writeNode(c, w);
                }
                w.write("</");
                w.write(n.getNodeName());
                w.write(">");
            } else {
                w.write("/>");
            }
            break;
        case Node.TEXT_NODE:
            w.write(contentToString(n.getNodeValue()));
            break;
        case Node.CDATA_SECTION_NODE:
            w.write("<![CDATA[");
            w.write(n.getNodeValue());
            w.write("]]>");
            break;
        case Node.ENTITY_REFERENCE_NODE:
            w.write("&");
            w.write(n.getNodeName());
            w.write(";");
            break;
        case Node.PROCESSING_INSTRUCTION_NODE:
            w.write("<?");
            w.write(n.getNodeName());
            // TD: Bug #19392
            w.write(" ");
            w.write(n.getNodeValue());
            w.write("?>");
            break;
        case Node.COMMENT_NODE:
            w.write("<!--");
            w.write(n.getNodeValue());
            w.write("-->");
            break;
        case Node.DOCUMENT_TYPE_NODE: {
            DocumentType dt = (DocumentType) n;
            w.write("<!DOCTYPE ");
            w.write(n.getOwnerDocument().getDocumentElement().getNodeName());
            String pubID = dt.getPublicId();
            if (pubID != null) {
                w.write(" PUBLIC \"" + dt.getNodeName() + "\" \"" + pubID
                        + "\">");
            } else {
                String sysID = dt.getSystemId();
                if (sysID != null)
                    w.write(" SYSTEM \"" + sysID + "\">");
            }
            break;
        }
        default:
            throw new IOException("Unknown DOM node type "
                    + n.getNodeType());
        }
    }
    /**
     * Returns the given content value transformed to replace invalid
     * characters with entities.
     */
    public static String contentToString(String s) {
        if (s == null) {
            return "";
        }
        StringBuffer result = new StringBuffer(s.length());

        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);

            switch (c) {
            case '<':
                result.append("&lt;");
                break;
            case '>':
                result.append("&gt;");
                break;
            case '&':
                result.append("&amp;");
                break;
            case '"':
                result.append("&quot;");
                break;
            case '\'':
                result.append("&apos;");
                break;
            default:
                result.append(c);
            }
        }

        return result.toString();
    }
}
Serializes the given DOM node using #writeNode(Node,Writer) and returns the XML as a String. - Java XML

Description

Demo Code

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