<EXT2><![CDATA["不能"]]> </EXT2>

被转义成了

 <EXT2>&lt;![CDATA["不能"]]&gt;</EXT2>

import org.springframework.web.util.HtmlUtils;

public String objToXml(Object obj) {
    StringWriter sw = new StringWriter();
    try {
        JAXBContext jaxbContext = JAXBContext.newInstance(obj.getClass());
        Marshaller marshaller = jaxbContext.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
        marshaller.marshal(obj, sw);
    } catch (JAXBException e) {
        e.printStackTrace();
    }
    String xml = HtmlUtils.htmlUnescape(sw.toString());
    return xml;
}

 <EXT2><![CDATA["不能"]]></EXT2>