自己创建本地文件Hello.txt 里面有数据

小明／23/增城／广东
小花／12/浦东／上海

StudentManager.java

package com.lanqiao.dmeo7;import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;public class StudentManager {// 创建集合List<Student> list = new ArrayList<Student>();// 加载数据方法public void load(String file) throws Exception {// 创建文件File files = new File("D:/Hello.txt");// 字节流转字符流Reader re = new FileReader(files);BufferedReader br = new BufferedReader(re);String str = null;while ((str = br.readLine()) != null) {System.out.println("读取文件：\n" + str);// 拆分每一行数据存进去数组String[] date = str.split("/");// 创建对象 将每一行的数据存进对象里面Student stu = new Student();stu.setName(date[0]);// 注意：在这里需要转型 字符串转整形stu.setAge(Integer.parseInt(date[1]));stu.setCity(date[2]);stu.setProvince(date[3]);// 将对象保存在集合中list.add(stu);}// 遍历输出集合中的数据 第一种for (int i = 0; i < list.size(); i++) {Student s = (Student) list.get(i);System.out.println(s.getName() + "\t" + s.getAge() + "\t" + s.getCity() + "\t" + s.getProvince() + " ");}// 第二种 foreach/** for(Student stu : list) { System.out.println(stu.getName()+" "+stu.getAge());* }*/}// 创建xml文件public void creatXml() throws FileNotFoundException, IOException {// 1.创建文档Document doc = new Document();// 2.创建根结点   在这里的根结点是通过new  出来的  因为是从没有到有的Element rootElement = new Element("Students");//通过集合循环添加对象里面的属性   用setTest 方法for (int i = 0; i < list.size(); i++) {// 3.往根结点中添加下面的子节点rootElement.addContent(new Element("Student").addContent(new Element("name").setText(list.get(i).getName())) // 集合里面不指定范型是用不了Student// 对象里面的方法的// 这里要将整形转化为字符串 只要在后面加一个双引号就行了.addContent(new Element("age").setText(list.get(i).getAge() + "")).addContent(new Element("city").setText(list.get(i).getCity())).addContent(new Element("province").setText(list.get(i).getProvince())));}// 4.把根结点绑定在文档上doc.addContent(rootElement);// 5.保存生成的Xml文档IO流 这里是指定输出格式 还有编码格式XMLOutputter output = new XMLOutputter(Format.getPrettyFormat().setEncoding("UTF-8").setIndent("    "));// 指定输出xml的名字 用的是文件输出流 OutputStream out = new FileOutputStream();// 让子类去实现output.output(doc, new FileOutputStream("config.xml"));System.out.println("操作完成，请刷新");}// 增 追加xml文件内容public void addXml(Student stu) throws Exception {// 创建工厂SAXBuilder builder = new SAXBuilder();// 创建文档Document doc = builder.build(new File("config.xml"));//在这里记得是new File  出来先// 获取根结点Element rootEle = new Element("Students");// 往根结点下面的子节点中添加节点rootEle.addContent(new Element("Student").addContent(new Element("name").setText(stu.getName())).addContent(new Element("age").setText(stu.getAge() + "")).addContent(new Element("city").setText(stu.getCity())).addContent(new Element("province").setText(stu.getProvince())));// 将文档绑定到根结点中doc.addContent(rootEle);XMLOutputter output = new XMLOutputter(Format.getPrettyFormat().setEncoding("UTF-8").setIndent("    "));output.output(doc, new FileOutputStream("config.xml"));}// 删 根据名字来删除public void delXml(String delName) throws JDOMException, IOException {//创建工厂SAXBuilder builder = new SAXBuilder();//创建文档Document doc = builder.build(new File("config.xml"));//获取根结点Element ele = doc.getRootElement();//获取Element 总根结点下面的所有子节点 List<Element> lis = ele.getChildren();//遍历查找for (int i = 0; i < lis.size(); i++) {//获取每一个具体的子节点 例如说 student   student  student Element e = lis.get(i);if(e.getName().equals(delName)) {//删除子节点的时候要根据根结点来删除ele.removeContent(e);System.out.println("Delete Name Successful");}}}// 改 根据名字来修改public void updateXml(String oldName, String newName) throws JDOMException, IOException {// 创建工厂SAXBuilder builder = new SAXBuilder();// 创建文档Document doc = builder.build(new File("config.xml"));// 获取根结点Element ele = doc.getRootElement();//获取根结点下面的子节点   返回的是一个集合List<Element> li = ele.getChildren();  //记得指定集合的类型  不然下面需要转类型//遍历查找for(int i = 0; i<li.size();i++) {Element e = li.get(i);if(e.getChildText("name").equals(oldName)) {//getChile 和  getChileText  的区别是  前者获取的是节点   后者是获取节点里面的值e.getChild("name").setText(newName);//这句话的意思是 第二个根结点下获取的name这个子节点 并且赋值成newNameSystem.out.println("Update Info Successfully!!");}}//将根结点绑定在文档上面doc.addContent(ele);XMLOutputter output = new XMLOutputter(Format.getPrettyFormat().setEncoding("UTF-8").setIndent("    "));output.output(doc, new FileOutputStream("config.xml"));}// 查 根据名字来查询public void findByName(String findByName) throws JDOMException, IOException {//创建工厂SAXBuilder builder = new SAXBuilder();//创建文档Document doc = builder.build(new File("config.xml"));//获取根结点Element ele = doc.getRootElement();//将根结点下面的所有节点找出来  返回element 集合  而不是StudentList<Element> list = ele.getChildren();//遍历查找for (int i = 0; i < list.size(); i++) {Element e = list.get(i);if(e.getName().equals(findByName)) {System.out.println("查询结果如下：\n"+e.getChildText("age")+"\t"+e.getChildText("city"));}}}}

Test.java

package com.lanqiao.dmeo7;/*** 对XMl的增、删、改、查的综合运用* * 结合集合的运用* @author qichunlin**/
public class Test {public static void main(String[] args) throws Exception {StudentManager sm = new StudentManager();sm.load("D:/Hello.txt");//增sm.addXml(new Student("小花",23,"武汉","湖南"));//删sm.delXml("小齐");//改sm.updateXml("小齐","小qi");//查sm.findByName("小七");}
}

Student.java

package com.lanqiao.dmeo7;/*** 学生类  * 属性： 名字   年龄  城市  省份* * @author qichunlin**/
public class Student {private String name;private int age;private String city;private String province;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 getCity() {return city;}public void setCity(String city) {this.city = city;}public String getProvince() {return province;}public void setProvince(String province) {this.province = province;}public String toString() {return "Student [name=" + name + ", age=" + age + ", city=" + city + ", province=" + province + "]";}public Student(String name, int age, String city, String province) {super();this.name = name;this.age = age;this.city = city;this.province = province;}public Student() {super();// TODO Auto-generated constructor stub}}