omitting xml declaration in xstream

问题

I want to append content to xml using xstream but using xstream.toXml(obj,writer) every time I run this, it is adding xml declaration to the content, can we omit xml declaration in xstream?

回答1:

In a meantime the XStream team is fixing the issue you may do workaround. Just override the createStaxWriter in StaxDriver:

    StaxDriver driver = new StaxDriver() {
        @Override
        public StaxWriter createStaxWriter(XMLStreamWriter out) throws XMLStreamException {
            //the boolean parameter controls the production of XML declaration
            return createStaxWriter(out, false);  
        }
    };
    XStream xstream = new XStream(driver);

回答2:

I just had this issue (using XStream 1.4.4). The problem occurs if you use the StaxDriver instead of the JAXP DOM one or the default XPP3 one. So either switch to:

XStream xstream = new XStream();

(with the XPP3 and xmlpull JARs on the classpath) or

XStream xstream = new XStream(new DomDriver());

instead of

XStream xstream = new XStream(new StaxDriver());

This is presumably a (consistency) bug in XStream, since its FAQ explicitly states that it is for writing snippets and doesn't produce the XML declaration (see also this question). It provides no methods/settings to not produce it because it should never be produced! I will look into raising it with them.

来源：https://stackoverflow.com/questions/15622029/omitting-xml-declaration-in-xstream