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<?xml version="1.0" encoding="utf-8"?> <书架> <书> <书名>浪潮之巅</书名> <作者>吴军</作者> <售价>39.00元</售价> </书> <书> <书名>数学之美</书名> <作者>吴军</作者> <售价>28.00元</售价> </书> </书架>
import java.io.IOException; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; 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 org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.SAXException; public class ParseXml { public static void main(String[] args) { //多态,返回的是内部实现的一个子类的实例 DocumentBuilderFactory documentBuilderFactory=DocumentBuilderFactory.newInstance(); try { //多态 DocumentBuilder documentBuilder= documentBuilderFactory.newDocumentBuilder(); //拿到文档对象模型,DOM树 Document document=documentBuilder.parse("Books.xml"); //从DOM树中取出标签名,返回一个结点list NodeList nodeList=document.getElementsByTagName("书"); //取出下标为0的结点 Node booksName0=nodeList.item(0); //取得结点的结点名称 String name=booksName0.getNodeName(); //取得该节点的父节点,返回一个结点node,调用getNodeName方法返回字符串 String parentName=booksName0.getParentNode().getNodeName(); System.out.println("结点名称:<"+name+">,父节点:<"+parentName+">"); //=================================================================== //二、打印某节点的所有元素节点 ,用第二个书结点 Node bookname1=nodeList.item(1); NodeList childNodesList=bookname1.getChildNodes(); int listLength=childNodesList.getLength(); for (int i = 0; i < listLength; i++) { //因为XML中的空格换行等也属于子节点,故找到结点类型为1-->即元素,才打印 if (childNodesList.item(i).getNodeType()==1) { String nodeName=childNodesList.item(i).getNodeName(); System.out.println("第"+i+"个子节点<"+nodeName+">"); } } // ========================================================================= // 三、修改某个元素结点的主体内容--->将"数学之美"改为"编程之美" // 从子节点list中得到书名元素,用getTextContent String book2=childNodesList.item(1).getTextContent(); System.out.println("更改之前的书名:"+book2); childNodesList.item(1).setTextContent("编程之美"); System.out.println("更改之前的书名:"+childNodesList.item(1).getTextContent()); //注意,更改了名字只是保存在内存中,并未保存到原文件中 // ========================================================================= // 四、向指定元素节点中增加子元素节点,向第二本书增加一个子元素“评价” Element element= document.createElement("评价"); element.setTextContent("五星"); bookname1.appendChild(element); // =============================================================================== // 五、删除元素结点,删除刚刚增加的元素 Node comment=document.getElementsByTagName("评价").item(0); bookname1.removeChild(comment); //存盘的标准写法 TransformerFactory tsf =TransformerFactory.newInstance(); Transformer tsTransformer = tsf.newTransformer(); tsTransformer.transform( new DOMSource(document), new StreamResult("src/books.xml")); } catch (ParserConfigurationException e) { e.printStackTrace(); } catch (SAXException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (TransformerConfigurationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (TransformerException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
<?xml version="1.0" encoding="UTF-8" standalone="no"?> <exam> <student idcard="111" examid="222"> <name>张三</name> <location>沈阳</location> <grade>89</grade> </student> <student idcard="333" examid="444"> <name>李四</name> <location>大连</location> <grade>97</grade> </student> </exam>
import java.io.IOException; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; 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 org.w3c.dom.Attr; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.SAXException; public class ExamXML { public static void main(String[] args) { //1. 向该xml文档里添加一个用户,姓名:王五,;location:铁岭;grade:99 DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); try { DocumentBuilder documentBuilder=documentBuilderFactory.newDocumentBuilder(); //拿到dom树 Document document=documentBuilder.parse("exam.xml"); //拿到父节点 Node superNode = document.getElementsByTagName("exam").item(0); Element studentElement=document.createElement("student"); Element nameElement=document.createElement("name"); Element locationElement=document.createElement("location"); Element gradeElement=document.createElement("grade"); nameElement.setTextContent("王五"); locationElement.setTextContent("铁岭"); gradeElement.setTextContent("99"); studentElement.appendChild(nameElement); studentElement.appendChild(locationElement); studentElement.appendChild(gradeElement); superNode.appendChild(studentElement); NodeList WangwuInfo=document.getElementsByTagName("student").item(2).getChildNodes(); for (int i = 0; i < WangwuInfo.getLength(); i++) { if (WangwuInfo.item(i).getNodeType()==1) { System.out.println("第"+i+"个标签内的文本是:"+WangwuInfo.item(i).getTextContent()); } } //========================================================================================= //2. 给每个学生增加一条信息,性别 NodeList studentList=document.getElementsByTagName("student"); for (int i = 0; i < studentList.getLength(); i++) { Element gender=document.createElement("性别"); studentList.item(i).appendChild(gender); } System.out.println("给每个学生增加性别标签,共有"+document.getElementsByTagName("性别").getLength()+"个学生增加"); //================================================================================== //3. 删除第一个学生张三的所有信息。 Node zhangsan=document.getElementsByTagName("student").item(0); superNode.removeChild(zhangsan); System.out.println("删除了张三后的学生标签有:"+studentList.getLength()); //====================================================================================== //4. 将第二个学生李四的姓名改为 李四光 Node lisiInfo=document.getElementsByTagName("student").item(0); String lisiName=lisiInfo.getChildNodes().item(1).getTextContent(); System.out.println("李四更改名字之前:"+lisiName); lisiInfo.getChildNodes().item(1).setTextContent("李四光"); System.out.println("更改名字之后"+lisiInfo.getChildNodes().item(1).getTextContent()); //========================================================================================= //5. 给每个学生增加一个ID属性 //增加属性是元素对象的方法,故从Node强转为element类型 for (int i = 0; i < studentList.getLength(); i++) { Attr idAttr=document.createAttribute("id"); Element element=(Element) studentList.item(i); element.setAttributeNode(idAttr); } //强转 Element element=(Element) studentList.item(0); //设置属性 element.setAttribute("id", "1234"); //打印属性 System.out.println("id:"+element.getAttribute("id")); Element element1=(Element) studentList.item(1); element1.setAttribute("id", "98765"); System.out.println("id:"+element1.getAttribute("id")); //存盘操作 TransformerFactory tsf =TransformerFactory.newInstance(); Transformer tsTransformer = tsf.newTransformer(); tsTransformer.transform( new DOMSource(document), new StreamResult("src/Exam.xml")); } catch (ParserConfigurationException e) { e.printStackTrace(); } catch (SAXException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (TransformerConfigurationException e) { e.printStackTrace(); } catch (TransformerException e) { e.printStackTrace(); } } }
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原文地址:http://www.cnblogs.com/linchaohao/p/5141077.html