<分区>
这个问题之前在 stackoverflow 中被问过:
真的不可能吗？
使用 insertBefore我想对元素的属性序列进行排序。具体来说，在下面的示例中，如何更改属性的顺序？只使用 setAttribute 会更容易吗？从一个节点？在任何一种情况下，顺序似乎都是自动发生的，尽管 insertBefore 肯定意味着可以指定顺序。
代码:
package xml;
import java.io.FileWriter;
import java.io.IOException;
import java.io.StringWriter;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import org.w3c.dom.Attr;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class Main {
private static final Logger logger = Logger.getLogger(Main.class.getName());
/**
* catches errors
*/
public Main() {
try {
createDoc();
} catch (ParserConfigurationException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
} catch (TransformerConfigurationException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
} catch (TransformerException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void createDoc()
throws ParserConfigurationException, TransformerConfigurationException, TransformerException, IOException {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
dbf.setIgnoringComments(false);
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.newDocument();
doc.setXmlStandalone(true);
Comment comment = doc.createComment(" nodes ");
doc.appendChild(comment);
Element root = doc.createElement("foo");
root.setAttribute("Version", "1.0");
doc.appendChild(root);
Element bar = doc.createElement("bar");
Element baz = doc.createElement("baz");
Element child1 = doc.createElementNS("foo", "bar");
child1.setPrefix("prefix1");
Attr attr1 = doc.createAttribute("attr1");
attr1.setValue("val1");
Element child2 = doc.createElementNS("foo", "bar");
child2.setPrefix("prefix2");
Attr attr2 = doc.createAttribute("attr2");
attr2.setValue("val2");
baz.setAttributeNode(attr2);
baz.setAttributeNode(attr1);
root.appendChild(bar);
bar.appendChild(baz);
writeToFile(doc);
}
private void writeToFile(Document doc)
throws TransformerConfigurationException, TransformerException, IOException {
TransformerFactory transformerFactory = TransformerFactory.newInstance();
transformerFactory.setAttribute("indent-number", new Integer(2));
Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.VERSION, "1.0");
StringWriter sw = new StringWriter();
StreamResult result = new StreamResult(sw);
DOMSource source = new DOMSource(doc);
transformer.transform(source, result);
logger.log(Level.INFO, "\n{0}", sw.toString());
result = new StreamResult(new FileWriter("test.xml"));
transformer.transform(source, result);
}
public static void main(String args[]) {
Main main = new Main();
}
}