欧美成人午夜免费全部完,亚洲午夜福利精品久久,а√最新版在线天堂,另类亚洲综合区图片小说区,亚洲欧美日韩精品色xxx

扣丁學(xué)堂Java培訓(xùn)之操作XML工具類XmlUtil詳解

2018-12-25 14:35:58 1300瀏覽

　　今天扣丁學(xué)堂Java培訓(xùn)老師給大家介紹一下關(guān)于Java操作XML工具類的具體代碼，希望對同學(xué)們學(xué)習(xí)有所幫助，僅供大家參考，具體內(nèi)容如下：

一、代碼

public class XmlUtil {
 /**
 * 將XML文件輸出到指定的路徑
 * 
 * @param doc
 * @param fileName
 * @throws Exception
 */
 public static void outputXml(Document doc, String fileName)
 throws Exception {
 TransformerFactory tf = TransformerFactory.newInstance();
 Transformer transformer = tf.newTransformer();
 DOMSource source = new DOMSource(doc);
 transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
 transformer.setOutputProperty(OutputKeys.INDENT, "yes");
 PrintWriter pw = new PrintWriter(new FileOutputStream(fileName));
 StreamResult result = new StreamResult(pw);
 transformer.transform(source, result);
 System.out.println("生成XML文件成功!");
 }
  
 /**
 * 生成XML
 * 
 * @param ip
 * @return
 */
 public static Document generateXml(String ip) {
 Document doc = null;
 Element root = null;
 try {
 DocumentBuilderFactory factory = DocumentBuilderFactory
  .newInstance();
 DocumentBuilder builder = factory.newDocumentBuilder();
 doc = builder.newDocument();
 root = doc.createElement("errorDevices");
 doc.appendChild(root);
 } catch (Exception e) {
 e.printStackTrace();
 return null;// 如果出現(xiàn)異常，則不再往下執(zhí)行
 }
  
 Element element;
 element = doc.createElement("errorDevice");
 element.setAttribute("ip", ip);
 element.setAttribute("date",
 StringUtil.formatDate(new Date(), "yyyy-MM-dd hh:mm:ss"));
 element.setAttribute("status", "1");
 root.appendChild(element);
 return doc;
 }
  
 /**
 * 新增Xml節(jié)點(diǎn)
 * 
 * @param ip
 * @param fileName
 * @return
 * @throws FileNotFoundException
 * @throws TransformerException
 */
 public static void toWrite(String filename, String ip)
 throws FileNotFoundException, TransformerException {
 String date = StringUtil.formatDate(new Date(), "yyyy-MM-dd hh:mm:ss");
 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 DocumentBuilder builder = null;
 Document doc = null;
 try {
 builder = factory.newDocumentBuilder();
 doc = builder.parse(new File(filename));
 } catch (ParserConfigurationException e) {
 e.printStackTrace();
 } catch (SAXException e) {
 e.printStackTrace();
 } catch (IOException e) {
 e.printStackTrace();
 }
 NodeList links = doc.getElementsByTagName("errorDevice");
 if (links.getLength() > 0) {
 for (int i = 0; i < links.getLength(); i++) {
 Node nd = links.item(i);
 Node catParent = nd.getParentNode();
 Element ele = (Element) nd;
 String url = ele.getAttribute("ip");
 if (url.equals(ip)) {
  // ele.setAttribute("date", date);
  catParent.removeChild(nd);
 }
 }
 }
 Element element = doc.createElement("errorDevice");
 element.setAttribute("ip", ip);
 element.setAttribute("date",
 StringUtil.formatDate(new Date(), "yyyy-MM-dd hh:mm:ss"));
 element.setAttribute("status", "1");
 doc.getDocumentElement().appendChild(element);
 TransformerFactory tf = TransformerFactory.newInstance();
 Transformer transformer = tf.newTransformer();
 DOMSource source = new DOMSource(doc);
 transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
 transformer.setOutputProperty(OutputKeys.INDENT, "yes");
 PrintWriter pw = new PrintWriter(new FileOutputStream(filename));
 StreamResult result = new StreamResult(pw);
 transformer.transform(source, result);
 System.out.println("新增XML節(jié)點(diǎn)成功!");
 }
  
 /**
 * 讀取XML
 * 
 * @param filename
 * @return
 */
 public static List<Map> readXml(String filename){
 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 DocumentBuilder builder = null;
 Document doc = null;
 try {
 builder = factory.newDocumentBuilder();
 doc = builder.parse(new File(filename));
 } catch (ParserConfigurationException e) {
 e.printStackTrace();
 } catch (SAXException e) {
 e.printStackTrace();
 } catch (IOException e) {
 e.printStackTrace();
 }
 NodeList links = doc.getElementsByTagName("errorDevice");
 List<Map> list = new ArrayList<Map>();
 for(int i = 0; i< links.getLength() ; i ++){
   Element node = (Element)links.item(i);
   Map map = new HashMap();
   map.put(node.getAttribute("ip"), node.getAttribute("date"));
   list.add(map);
 }
 return list;
 }
}

二、演示XML

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<errorDevices>
 <errorDevice date="2017-03-13 12:54:16" ip="20.100.156.42" status="1"/>
 <errorDevice date="2017-03-13 12:54:56" ip="20.100.156.41" status="1"/>
</errorDevices>

三、最終效果圖

以上就是關(guān)于扣丁學(xué)堂Java培訓(xùn)之操作XML工具類XmlUtil詳解的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，請關(guān)注扣丁學(xué)堂Java培訓(xùn)官網(wǎng)、微信等平臺，扣丁學(xué)堂IT職業(yè)在線學(xué)習(xí)教育平臺不僅為您提供權(quán)威的Java視頻教程供大家學(xué)習(xí)，還精心的準(zhǔn)備了Java從入門到精通開發(fā)實(shí)戰(zhàn)技能，定能讓你學(xué)有所成?？鄱W(xué)堂Java技術(shù)交流群：670348138。

【關(guān)注微信公眾號獲取更多學(xué)習(xí)資料】

查看更多關(guān)于“Java開發(fā)資訊”的相關(guān)文章>>