java W3C DOM解析XML

package com.netunit.workbench.util;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerConfigurationException;import javax.xml.transform.TransformerException;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import javax.xml.xpath.XPath;import javax.xml.xpath.XPathConstants;import javax.xml.xpath.XPathExpressionException;import javax.xml.xpath.XPathFactory;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;/** * 对存储网元信息的XML进行操作 * * @author 何明 * */public class HandleXML { private Element theNetunit = null; private Element theProperties = null; private Element root = null; public HandleXML() { } /** * 增加网元 * * @param ip * @param geteway * @param subnet * @param describe * @return */ public int toWrite(String ip, String geteway, String subnet, String describe) { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); try { factory.setIgnoringElementContentWhitespace(true); DocumentBuilder db = factory.newDocumentBuilder(); File file = new File( "E:\\workspace\\com.netunit.workbench\\com.netunit.workbench\\com.netunit.workbench\\Info.xml"); Document xmldoc = db.parse(file); root = xmldoc.getDocumentElement(); // 新建网元// theNetunit = xmldoc.createElement("root"); theNetunit = xmldoc.createElement("info"); theNetunit.setAttribute("id", ip);// theNetunit.appendChild(theProperties); theProperties = xmldoc.createElement("IP"); theProperties.setTextContent(ip); theNetunit.appendChild(theProperties); theProperties = xmldoc.createElement("gateway"); theProperties.setTextContent(geteway); theNetunit.appendChild(theProperties); theProperties = xmldoc.createElement("subnet"); theProperties.setTextContent(subnet); theNetunit.appendChild(theProperties); theProperties = xmldoc.createElement("describe"); theProperties.setTextContent(describe); theNetunit.appendChild(theProperties); root.appendChild(theNetunit); output(theNetunit); saveXml( "E:\\workspace\\com.netunit.workbench\\com.netunit.workbench\\com.netunit.workbench\\Info.xml", xmldoc); return 1; } catch (Exception e) { e.printStackTrace(); } return 0; } /** * 根据IP查找其下面节点的值 * * @param ip * @return */ public NetunitInfo getOtherMessage(String ip) { NetunitInfo info = new NetunitInfo(); try { DocumentBuilderFactory factory = DocumentBuilderFactory .newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); File file = new File( "E:\\workspace\\com.netunit.workbench\\com.netunit.workbench\\com.netunit.workbench\\Info.xml"); Document doc = builder.parse(file); NodeList le = doc.getDocumentElement().getElementsByTagName("IP"); for (int i = 0; i < le.getLength(); i++) { Node no = le.item(i); if (ip.equals(no.getFirstChild().getNodeValue())) { info.setIp(no.getFirstChild().getNodeValue()); Node n = no.getNextSibling(); info.setGateway(n.getNextSibling().getFirstChild() .getNodeValue()); Node n1 = n.getNextSibling().getNextSibling(); info.setSubnet(n1.getNextSibling().getFirstChild() .getNodeValue()); Node n2 = n1.getNextSibling().getNextSibling(); info.setDescribe(n2.getNextSibling().getFirstChild() .getNodeValue()); } } return info; } catch (Exception e) { e.printStackTrace(); } return null; } // 根据IP值修改其下面三个节点的值 public int toUpdate(String ip, String gateway, String subnet, String describe) { try { DocumentBuilderFactory factory = DocumentBuilderFactory .newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); File file = new File( "E:\\workspace\\com.netunit.workbench\\com.netunit.workbench\\com.netunit.workbench\\Info.xml"); Document doc = builder.parse(file); NodeList le = doc.getDocumentElement().getElementsByTagName("IP"); for (int i = 0; i < le.getLength(); i++) { Node no = le.item(i); if (ip.equals(no.getFirstChild().getNodeValue())) { Node n = no.getNextSibling(); n.getNextSibling().getFirstChild().setNodeValue(gateway); Node n1 = n.getNextSibling().getNextSibling(); n1.getNextSibling().getFirstChild().setNodeValue(subnet); Node n2 = n1.getNextSibling().getNextSibling(); n2.getNextSibling().getFirstChild().setNodeValue(describe); saveXml( "E:\\workspace\\com.netunit.workbench\\com.netunit.workbench\\com.netunit.workbench\\Info.xml", doc); } } return 1; } catch (Exception e) { e.printStackTrace(); } return 0; } // 根据IP删除节点信息 public int toDelete(String ip) { try { DocumentBuilderFactory factory = DocumentBuilderFactory .newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); File file = new File( "E:\\workspace\\com.netunit.workbench\\com.netunit.workbench\\com.netunit.workbench\\Info.xml"); Document doc = builder.parse(file); NodeList le = doc.getElementsByTagName("info"); for(int i = 0; i < le.getLength(); i++){ Element e = (Element) le.item(i); if(ip.equals(e.getAttribute("id"))){ e.getParentNode().removeChild(e); saveXml( "E:\\workspace\\com.netunit.workbench\\com.netunit.workbench\\com.netunit.workbench\\Info.xml", doc); } } } catch (Exception e) { e.printStackTrace(); } return 0; } /** * 将添加的信息打印在控制台 * * @param node */ public static void output(Node node) { TransformerFactory transFactory = TransformerFactory.newInstance(); try { Transformer transformer = transFactory.newTransformer(); transformer.setOutputProperty("encoding", "gb2312"); transformer.setOutputProperty("indent", "yes"); DOMSource source = new DOMSource(); source.setNode(node); StreamResult result = new StreamResult(); result.setOutputStream(System.out); transformer.transform(source, result); } catch (TransformerConfigurationException e) { e.printStackTrace(); } catch (TransformerException e) { e.printStackTrace(); } } /** * 查找子节点 * * @param express * @param source * @return */ public static NodeList selectNodes(String express, Object source) { NodeList result = null; XPathFactory xpathFactory = XPathFactory.newInstance(); XPath xpath = xpathFactory.newXPath(); try { result = (NodeList) xpath.evaluate(express, source, XPathConstants.NODESET); } catch (XPathExpressionException e) { e.printStackTrace(); } return result; } /** * 得到节点值 * * @param key * @return */ public static String[] getNodeValue(String key) { try { DocumentBuilderFactory factory = DocumentBuilderFactory .newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); File file = new File( "E:\\workspace\\com.netunit.workbench\\com.netunit.workbench\\com.netunit.workbench\\Info.xml"); Document doc = builder.parse(file); String[] str = new String[doc.getDocumentElement() .getElementsByTagName("IP").getLength()]; NodeList le = doc.getDocumentElement().getElementsByTagName("IP"); for (int i = 0; i < le.getLength(); i++) { Node no = le.item(i); str[i] = no.getTextContent(); } return str; } catch (Exception e) { e.printStackTrace(); } return null; } /** * 输出到文本 * * @param fileName * @param doc */ public static void saveXml(String fileName, Document doc) { TransformerFactory transFactory = TransformerFactory.newInstance(); try { Transformer transformer = transFactory.newTransformer(); transformer.setOutputProperty("indent", "yes"); DOMSource source = new DOMSource(); source.setNode(doc); StreamResult result = new StreamResult(); result.setOutputStream(new FileOutputStream(fileName)); transformer.transform(source, result); } catch (TransformerConfigurationException e) { e.printStackTrace(); } catch (TransformerException e) { e.printStackTrace(); } catch (FileNotFoundException e) { e.printStackTrace(); } } public static void main(String[] args) { HandleXML hand = new HandleXML(); // 添加 // hand.toWrite("192.168.0.2", "192.168.0.1", "255.255.255.255", // "iiiiiiiiiiiiiip"); hand.toDelete("192.168.0.1"); // 读 try { // DocumentBuilderFactory factory = DocumentBuilderFactory // .newInstance(); // DocumentBuilder builder = factory.newDocumentBuilder(); // // File file = new File("Info.xml"); // Document doc = builder.parse(file); // String[] str = new // String[doc.getDocumentElement().getElementsByTagName("IP").getLength()]; // // System.out.println(str.length); // // NodeList le = // doc.getDocumentElement().getElementsByTagName("IP"); // for(int i=0;i<le.getLength();i++){ // Node no = le.item(i); // System.out.println(no.getTextContent()); // str[i] = no.getTextContent(); // } // System.out.println(str.length); // // // // 根据IP的值读其下面的三个节点的值 // DocumentBuilderFactory factory = DocumentBuilderFactory // .newInstance(); // DocumentBuilder builder = factory.newDocumentBuilder(); // // File file = new // File("E:\\workspace\\com.netunit.workbench\\com.netunit.workbench\\com.netunit.workbench\\Info.xml"); // // Document doc = builder.parse(file); // // NodeList le = // doc.getDocumentElement().getElementsByTagName("IP"); // // for(int i=0;i<le.getLength();i++){ // Node no = le.item(i); // System.out.println(no.getFirstChild().getNodeValue()); // if("192.168.5.6".equals(no.getFirstChild().getNodeValue())){ // // NetunitInfo info = new NetunitInfo(); // // info.setIp(no.getFirstChild().getNodeValue()); // // Node n = no.getNextSibling(); // // info.setGateway(n.getNextSibling().getFirstChild().getNodeValue()); // // Node n1 = n.getNextSibling().getNextSibling(); // // System.out.println(n1.getNextSibling().getFirstChild().getNodeValue()); // info.setSubnet(n1.getNextSibling().getFirstChild().getNodeValue()); // // Node n2 = n1.getNextSibling().getNextSibling(); // // System.out.println(n2.getNextSibling().getFirstChild().getNodeValue()); // // info.setDescribe(n2.getNextSibling().getFirstChild().getNodeValue()); // // } // } } catch (Exception e) { e.printStackTrace(); } }} 相关资源：敏捷开发V1.0.pptx