1.創建一個xml文件，寫一些學生信息

<?xml version="1.0" encoding="UTF-8"?><person> <student> <id>001</id> <name>張三</name> <age>18</age> <city>北京</city> </student> <student> <id>002</id> <name>李四</name> <age>19</age> <city>太原</city> </student> <student> <id>003</id> <name>王五</name> <age>19</age> <city>杭州</city> </student> </person>

2.創建dom4j的工具類

package cn.yfy.util;import java.io.FileOutputStream;import org.dom4j.Document; import org.dom4j.io.OutputFormat; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter;public class Dom4jUtil {public static Document getDocument(String path) throws Exception {// 創建解析器SAXReader sr = new SAXReader();// 得到documentDocument doc = sr.read(path);return doc;}//回寫xmlpublic static void ReWrite(String path, Document doc) throws Exception {XMLWriter xmlWriter = new XMLWriter(new FileOutputStream(path),new OutputFormat().createPrettyPrint());xmlWriter.write(doc);xmlWriter.close();} }

3.創建操作該xml的類

package cn.yfy.util;import java.util.List;import org.dom4j.Document; import org.dom4j.Element;public class StudentManger {private String path;public StudentManger() {super();}public StudentManger(String path) {super();this.path = path;}public void SeekById(String id) throws Exception {// 獲得person根節點Document doc = Dom4jUtil.getDocument(path);Element root = doc.getRootElement();// 得到所有student節點List<Element> list = root.elements("student");// 遍歷student節點for (Element element : list) {// 獲取所選id值，并輸出其姓名年齡和所在地if (element.element("id").getText().equals(id)) {System.out.println("姓名:" + element.element("name").getText());System.out.println("年齡:" + element.element("age").getText());System.out.println("所在地:" + element.element("city").getText());break;}}}public void addStudent(String name, String id, String age, String city)throws Exception {// 獲得person根節點Document doc = Dom4jUtil.getDocument(path);Element root = doc.getRootElement();// 根節點上添加student標簽Element stu = root.addElement("student");// 給student標簽里面添加各種標簽并賦值Element id1 = stu.addElement("id");id1.setText(id);Element name1 = stu.addElement("name");name1.setText(name);Element age1 = stu.addElement("age");age1.setText(age);Element city1 = stu.addElement("city");city1.setText(city);// 回寫xmlDom4jUtil.ReWrite(path, doc);}public boolean removeById(String id) throws Exception {// 定義一個變量判斷是否刪除成功，返回false則代表沒有此idboolean boo = false;// 獲得person根節點Document doc = Dom4jUtil.getDocument(path);Element root = doc.getRootElement();// 得到所有student節點List<Element> list = root.elements("student");// 遍歷student節點for (Element element : list) {if (element.element("id").getText().equals(id)) {boo = true;element.getParent().remove(element);break;}}Dom4jUtil.ReWrite(path, doc);return boo;} }

4.模擬實現學生管理系統客戶端

package cn.yfy.server;import cn.yfy.util.StudentManger;public class Server {/*** 學生管理系統*/public static void main(String[] args) throws Exception {String path = "src/students.xml";//創建學生管理類StudentManger sm = new StudentManger(path);//通過id獲取學生信息sm.SeekById("001");//增加學生sm.addStudent("旺財", "007", "8", "火星");//刪除指定id的學生System.out.println(sm.removeById("009"));} }

總結

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