XmlSignatureHelper.java 文件源码

/**
 * Serializes a node using a certain character encoding.
 * 
 * @param node
 *            DOM node to serialize
 * @param os
 *            output stream, to which the node is serialized
 * @param omitXmlDeclaration
 *            indicator whether to omit the XML declaration or not
 * @param encoding
 *            character encoding, can be <code>null</code>, if
 *            <code>null</code> then "UTF-8" is used
 * @throws Exception
 */
public static void transformNonTextNodeToOutputStream(Node node, OutputStream os, boolean omitXmlDeclaration, String encoding)
    throws Exception { //NOPMD
    // previously we used javax.xml.transform.Transformer, however the JDK xalan implementation did not work correctly with a specified encoding
    // therefore we switched to DOMImplementationLS
    if (encoding == null) {
        encoding = "UTF-8";
    }
    DOMImplementationRegistry domImplementationRegistry = DOMImplementationRegistry.newInstance();
    DOMImplementationLS domImplementationLS = (DOMImplementationLS) domImplementationRegistry.getDOMImplementation("LS");
    LSOutput lsOutput = domImplementationLS.createLSOutput();
    lsOutput.setEncoding(encoding);
    lsOutput.setByteStream(os);
    LSSerializer lss = domImplementationLS.createLSSerializer();
    lss.getDomConfig().setParameter("xml-declaration", !omitXmlDeclaration);
    lss.write(node, lsOutput);
}