Java org.w3c.dom.ls.LSSerialize-设置文本换行、缩进大小

我使用以下代码缩进作为字符串提供给我的xml文档

如果有必要的话，我正在使用JDK实现的

org.w3c.dom.ls

公共字符串格式（字符串xml）{
试一试{
final InputSource src=新的InputSource（新的StringReader（xml））；
最终节点document=DocumentBuilderFactory.newInstance（）.newDocumentBuilder（）.parse（src）.getDocumentElement（）；
final Boolean keepDeclaration=Boolean.valueOf（xml.startsWith（“
public String format(String xml) {

    try {
        final InputSource src = new InputSource(new StringReader(xml));
        final Node document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(src).getDocumentElement();
        final Boolean keepDeclaration = Boolean.valueOf(xml.startsWith("<?xml"));

    //May need this: System.setProperty(DOMImplementationRegistry.PROPERTY,"com.sun.org.apache.xerces.internal.dom.DOMImplementationSourceImpl");

        final DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();
        final DOMImplementationLS impl = (DOMImplementationLS) registry.getDOMImplementation("LS");
        final LSSerializer writer = impl.createLSSerializer();

        writer.getDomConfig().setParameter("format-pretty-print", Boolean.TRUE); // Set this to true if the output needs to be beautified.
        writer.getDomConfig().setParameter("xml-declaration", keepDeclaration); // Set this to true if the declaration is needed to be outputted.

        return writer.writeToString(document);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}