this.location = location;
}
public double getGrade() {
return grade;
}
public void setGrade(double grade) {
this.grade = grade;
}
@Override
public String toString() {
return “学生姓名:”+name+“, 学生住址:”+location+“, 准考证号:”+examid+“, 身份证号:”+idcard+“, 成绩:”+grade;
}
}
俗称javabean的StudentDao类
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class StudentDao {
private static XmlUtils utils = new XmlUtils();
public static void add(Student student){
try {
Document document = utils.getDocument(); //获得要操作的xml文档的document对象
//创建各节点
Element student_node = document.createElement(“student”);
Element name_node = document.createElement(“name”);
Element location_node = document.createElement(“location”);
Element grade_node = document.createElement(“grade”);
//给各节点添加属性和值
student_node.setAttribute(“examid”, student.getExamid());
student_node.setAttribute(“idcard”, student.getIdcard());
name_node.setTextContent(student.getName());
location_node.setTextContent(student.getLocation());
grade_node.setTextContent(student.getGrade()+“”); //
//将各节点添加到相应位置
student_node.appendChild(name_node);
student_node.appendChild(location_node);
student_node.appendChild(grade_node);
//student_node.getParentNode().appendChild(student_node);
document.getElementsByTagName(“exam”).item(0).appendChild(student_node);
//将内存中的document对象重新写入xml文档
utils.write2Xml(document);
//System.out.println(“添加学生信息成功”);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static boolean delete(String name){
try {
Document document = utils.getDocument(); //获得要操作的xml文档的document对象
NodeList list = document.getElementsByTagName(“name”);
for(int i=0; list!=null && i
Node node = list.item(i);
if(node.getTextContent().equals(name)){
node.getParentNode().getParentNode().removeChild(node.getParentNode());
utils.write2Xml(document);
return true;
}
}
return false;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static Student find(String examid){
try {
Student s = new Student();
Document document = utils.getDocument();
NodeList list = document.getElementsByTagName(“student”);
for(int i=0; list!=null && i
Element node = (Element) list.item(i);
if(node.getAttribute(“examid”).equals(examid)){
s.setExamid(examid);
s.setIdcard(node.getAttribute(“idcard”));
s.setGrade(Double.parseDouble(node.getElementsByTagName(“grade”).item(0).getTextContent()));
s.setLocation(node.getElementsByTagName(“location”).item(0).getTextContent());
s.setName(node.getElementsByTagName(“name”).item(0).getTextContent());
return s;
}
}
} catch (Exception e) {
throw new RuntimeException(e);
}
return null;
}
}
封装主函数的Main类
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Main {
private static StudentDao dao = new StudentDao();
public static void main(String[] args) {
System.out.println(“操作类型: 添加学生信息:(a) 删除学生信息:(b) 查询学生信息:©”);
System.out.print("请选择操作类型： ");
Operation();
}
private static void Operation() {
try {
Student s = new Student();
//创建读取键盘的BufferedReader对象，并用转换流InputStreamReader将字节流System.in转换为字符流
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String type = br.readLine();
if(“a”.equals(type)){
System.out.print(“请输入学生姓名:”);
String name = br.readLine();
System.out.print(“请输入学生准考证号:”);
String examid = br.readLine();
System.out.print(“请输入学生身份证号:”);
String idcard = br.readLine();
System.out.print(“请输入学生住址:”);
String location = br.readLine();
System.out.print(“请输入学生成绩:”);
String grade = br.readLine();
s.setExamid(examid);
s.setGrade(Double.parseDouble(grade));
s.setIdcard(idcard);
s.setLocation(location);
s.setName(name);
dao.add(s);
System.out.println(“添加学生信息成功！！！”);
}else if(“b”.equals(type)){
System.out.print("请输入学生姓名: ");
String name = br.readLine();
boolean b = dao.delete(name);
if(b){
System.out.println(“删除学生信息成功！！”);
}else{ 《Android学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》无偿开源 徽信搜索公众号【编程进阶路】
System.out.println(“删除学生信息失败,请检查学生姓名是否输入正确！！”);
}
}else if(“c”.equals(type)){
System.out.print("请输入学生准考证号: ");
