package cn.itcast.vo;public class Student { private String name; private int age; private String sex; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public String toString(){ return name+":"+age+":"+sex; }} package student;import java.io.FileOutputStream;import java.util.List;import org.dom4j.Document;import org.dom4j.Element;import org.dom4j.Node;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;import cn.itcast.vo.Student;public class StuServer { //增加 public static void addStu(Student s) throws Exception{ SAXReader sax = new SAXReader(); Document document = sax.read("src/student.xml"); Element root = document.getRootElement(); Element stu = root.addElement("stu"); Element name = stu.addElement("name"); Element age = stu.addElement("age"); Element sex = stu.addElement("sex"); name.setText(s.getName()); age.setText(s.getAge()+""); sex.setText(s.getSex()); //回写 OutputFormat format = OutputFormat.createPrettyPrint(); XMLWriter xmlwriter = new XMLWriter(new FileOutputStream("src/student.xml"),format); xmlwriter.write(document); xmlwriter.close(); } //删除 根据学生的id public static void delStu(String name)throws Exception{ SAXReader sax = new SAXReader(); Document document = sax.read("src/student.xml"); List list=document.selectNodes("//name"); for(Node node:list){ String namev = node.getText(); if(namev.equals(name)){ Element stu = node.getParent(); Element student = stu.getParent(); student.remove(stu); } } //回写 OutputFormat format = OutputFormat.createPrettyPrint(); XMLWriter xmlwriter = new XMLWriter(new FileOutputStream("src/student.xml"),format); xmlwriter.write(document); xmlwriter.close(); } public static Student selectStu(String name)throws Exception{ SAXReader sax = new SAXReader(); Document document = sax.read("src/student.xml"); List list = document.selectNodes("//name"); Student s = new Student(); for(Node node : list){ String namev = node.getText(); if(namev.equals(name)){ Element stu = node.getParent(); int agev =Integer.parseInt(stu.element("age").getText()); String sexv = stu.element("sex").getText(); s.setAge(agev); s.setName(namev); s.setSex(sexv); } } return s; }} package cn.itcast.test;import cn.itcast.vo.Student;import student.StuServer;public class Test { public static void main(String[] args) throws Exception{// addTest();// delTest(); selectTest(); } public static void addTest() throws Exception{ Student s = new Student(); s.setName("tom"); s.setAge(20); s.setSex("男"); StuServer.addStu(s); } public static void delTest()throws Exception{ StuServer.delStu("tom"); } public static void selectTest()throws Exception{ Student student = StuServer.selectStu("王五"); System.out.println(student.toString()); }} 转载地址：https://blog.csdn.net/weixin_30536513/article/details/99758606 如侵犯您的版权，请留言回复原文章的地址，我们会给您删除此文章，给您带来不便请您谅解！
