标签:xml 文件 DOM item student import document 节点
<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE students SYSTEM "student.dtd"> <students> <student id="1"> <name>王同</name> <class>java</class> <score>89</score> </student> <student id="2"> <name>李佳</name> <class>sql</class> <score>58</score> </student> <student id="3"> <name>李白</name> <class>python</class> <score>90</score> </student> </students>
<!ELEMENT students (student+)> <!ELEMENT student (name,class,score)> <!ATTLIST student id CDATA #IMPLIED> <!ELEMENT name (#PCDATA)> <!ELEMENT class (#PCDATA)> <!ELEMENT score (#PCDATA)>
public class TestXML { public static void main(String[] args) throws ParserConfigurationException, IOException, SAXException { //1.得到document DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder documentBuilder = dbf.newDocumentBuilder(); //2.解析和加载xml文件到内存中去 Document document = documentBuilder.parse("student.xml"); //3.返回文档中的所有子节点 NodeList nodeList = document.getChildNodes(); Node root = nodeList.item(nodeList.getLength() - 1); System.out.println("root:" + root.getNodeName());//students //4.再查找他的子节点 NodeList childNodes = root.getChildNodes(); for (int i = 0; i < childNodes.getLength(); i++) { Node item = childNodes.item(i); if ("student".equals(item.getNodeName())) { NodeList nodes = item.getChildNodes(); for (int j = 0; j < nodes.getLength(); j++) { Node node = nodes.item(j); if ("name".equals(node.getNodeName())) { System.out.println("name:" + node.getTextContent()); } else if ("class".equals(node.getNodeName())) { System.out.println("class:" + node.getTextContent()); } else if ("score".equals(node.getNodeName())) { System.out.println("score:" + node.getTextContent()); } } } } } }
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; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import javax.xml.transform.*; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import java.io.FileOutputStream; import java.io.IOException; public class UpdateXML { public static void main(String[] args) throws ParserConfigurationException, IOException, SAXException, TransformerException { //使用DOM对XML文件进行数据修改 //1.得到document DocumentBuilderFactory dbf; dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder documentBuilder = dbf.newDocumentBuilder(); //解析和加载xml文件到内存中去 Document document = documentBuilder.parse("student.xml"); //1.删除某个节点 // NodeList list = document.getElementsByTagName("student"); // for (int i = 0; i < list.getLength(); i++) { // Element item = (Element)list.item(i); // //node:节点(文本节点),element:元素 // //凡是元素都是节点,但是节点不一定都是元素,例如:一个单纯的回车也是节点 //// System.out.println(item.getAttribute("id")); // if ("2".equals(item.getAttribute("id"))){ // item.getParentNode().removeChild(item); // } // } //2.添加节点 // //student(name class score) // Element student = document.createElement("student"); // student.setAttribute("id", "3");//设置属性值 // //name // Element stuName = document.createElement("name");//创建节点 // stuName.setTextContent("李白");//设置节点内容 // student.appendChild(stuName);//添加节点 // //class // Element stuClass = document.createElement("class"); // stuClass.setTextContent("python"); // student.appendChild(stuClass); // //score // Element stuScore = document.createElement("score"); // stuScore.setTextContent("90"); // student.appendChild(stuScore); // //找到根节点students // NodeList nodeList = document.getElementsByTagName("students"); // Node students = nodeList.item(nodeList.getLength() - 1); // students.appendChild(student); //修改:李白-》李清照 //1.查找节点 NodeList student3 = document.getElementsByTagName("student"); for (int i = 0; i < student3.getLength(); i++) { Element item = (Element)student3.item(i); if ("3".equals(item.getAttribute("id"))){ Node name = item.getElementsByTagName("name").item(0); //2.修改节点内容 name.setTextContent("李清照"); break; } } //保存成XML文件 TransformerFactory transformerFactory = TransformerFactory.newInstance(); Transformer transformer = transformerFactory.newTransformer(); DOMSource domSource = new DOMSource(document); // 设置编码类型 transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); StreamResult result = new StreamResult(new FileOutputStream("student.xml")); // 把DOM树转换为XML文件 transformer.transform(domSource, result); } }
标签:xml,文件,DOM,item,student,import,document,节点 来源: https://www.cnblogs.com/linlinmailbox/p/16514054.html
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