更新XML字符串
从给定的XML String，我必须更新结束日期值。 即使我在updateNodeValue（）方法中更新xml，我的最终输出xml与输入xml相同。
有人能告诉我这段代码中的错误是什么
import java.io.StringReader; import java.io.StringWriter; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.InputSource; public class MyClass{ static String strXml = "2013-12-022014-01-31"; public static void main(String[] args) throws Exception { System.out.println(strXml); Document doc = StringToDocument(strXml); updateNodeValue(doc); String newxml = DocumentToString(doc); System.out.println(newxml); } public static void updateNodeValue(Document doc) { Node rootNode = doc.getFirstChild(); NodeList list = rootNode.getChildNodes(); for (int i = 0; i < list.getLength(); i++) { Element element = (Element) list.item(i); Node node = list.item(i); if ("EndDate".equals(node.getNodeName())) { element.setNodeValue("2013-12-12"); return; } } } public static String DocumentToString(Document doc) throws Exception { TransformerFactory tf = TransformerFactory.newInstance(); Transformer transformer = tf.newTransformer(); transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes"); StringWriter writer = new StringWriter(); transformer.transform(new DOMSource(doc), new StreamResult(writer)); String output = writer.getBuffer().toString(); return output; } public static Document StringToDocument(String strXml) throws Exception { Document doc = null; try { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); StringReader strReader = new StringReader(strXml); InputSource is = new InputSource(strReader); doc = (Document) builder.parse(is); } catch (Exception e) { e.printStackTrace(); throw e; } return doc; } } 在updateNodeValue方法中使用element.setTextContent(...) 。
你应该使用的方法不是setNodeValue()而是setTextContent()
请参阅http://docs.oracle.com/javase/1.5.0/docs/api/org/w3c/dom/Node.html#setNodeValue(java.lang.String）