在maven构建单元测试中，Java将“on”序列化为不同的字节数据(在XMLStreamWriter上)

import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamWriter;
import java.io.StringWriter;

public class XMLSerializationExample {
    public static void main(String[] args) throws Exception {
        XMLOutputFactory factory = XMLOutputFactory.newInstance();
        StringWriter stringWriter = new StringWriter();
        XMLStreamWriter writer = factory.createXMLStreamWriter(stringWriter, "UTF-8");

        writer.writeStartDocument("UTF-8", "1.0");
        writer.writeStartElement("root");
        writer.writeCharacters("on");
        writer.writeEndElement();
        writer.writeEndDocument();

        writer.flush();
        writer.close();

        System.out.println(stringWriter.toString());
    }
}