Escape XML Strings with JDK class

Hi,
can anyone tell me how to escape XML-Strings with classes of the JDK?
When searching I only was pointed to StringEscapeUtils from apache.commons.lang, but we would prefer to use the JDK instead of integrating an external lib.
Our aim is to escape an XML attribute, so a CDATA is not applicable for us in this case.
Thanks
Jan

I implemented it by myself:
public static String escapeXmlAttribute(String attributeValue) {
        StringBuffer result = new StringBuffer();
        for (int c = 0; c < attributeValue.length(); ++c) {
            if (attributeValue.charAt(c) == '"') {
                result.append(""");
            } else if (attributeValue.charAt(c) == '&') {
                result.append("&");
            } else if (attributeValue.charAt(c) == '<') {
                result.append("<");
            } else if (attributeValue.charAt(c) == '>') {
                result.append(">");
            } else {
                result.append(attributeValue.charAt(c));
        return result.toString();
    }{code}

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