前端之家收集整理的这篇文章主要介绍了
日常练习-xml成绩管练习，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
package dao
import org.w3c.dom.Document
import org.w3c.dom.Element
import org.w3c.dom.NodeList
import utils.XmlUtils
import domain.Student
import exception.StudentNotExistException
public class StudentDao {
public void add(Student s){
try {
Document document = XmlUtils.getDocument()
//创建封装学生信息的标签
Element student_tag = document.createElement("student")
student_tag.setAttribute("idcard",s.getIdcard())
student_tag.setAttribute("examid",s.getExamid())
//创建用于封装学生姓名所在地和成绩的标签
Element name = document.createElement("name")
Element location = document.createElement("location")
Element grade = document.createElement("grade")
name.setTextContent(s.getName())
location.setTextContent(s.getLocation())
grade.setTextContent(s.getGrade()+"")
student_tag.appendChild(name)
student_tag.appendChild(location)
student_tag.appendChild(grade)
//封装挂到文档上
document.getElementsByTagName("exam").item(0).appendChild(student_tag)
//更新内存
XmlUtils.write2Xml(document)
} catch (Exception e) {
// TODO Auto-generated catch block
throw new RuntimeException(e)
}
}
public Student find(String examid){
try {
Document document = XmlUtils.getDocument()
NodeList list = document.getElementsByTagName("student")
for(int i=0
Element student_tag = (Element) list.item(i)
if(student_tag.getAttribute("examid").equals(examid)){
//找到了匹配的学生
Student s = new Student()
s.setExamid(examid)
s.setIdcard(student_tag.getAttribute("idcard"))
s.setName(student_tag.getElementsByTagName("name").item(0).getTextContent())
s.setLocation(student_tag.getElementsByTagName("grade").item(0).getTextContent())
s.setGrade(Double.parseDouble(student_tag.getElementsByTagName("grade").item(0).getTextContent()))
return s
}
}
return null
} catch (Exception e) {
// TODO Auto-generated catch block
throw new RuntimeException(e)
}
}
public void delete(String name) throws StudentNotExistException{
try {
Document document = XmlUtils.getDocument()
NodeList list = document.getElementsByTagName("name")
for(int i = 0
if(list.item(i).getTextContent().equals(name)){
list.item(i).getParentNode().getParentNode().removeChild(list.item(i).getParentNode())
XmlUtils.write2Xml(document)
return
}
}
throw new StudentNotExistException(name+"is not exist!")
}catch(StudentNotExistException e){
throw e
}
catch (Exception e) {
// TODO Auto-generated catch block
throw new RuntimeException(e)
}
}
}
package domain;
public class Student {
private String idcard;
private String examid;
private String name;
private String location;
private double grade;
public String getIdcard() {
return idcard;
}
public void setIdcard(String idcard) {
this.idcard = idcard;
}
public String getExamid() {
return examid;
}
public void setExamid(String examid) {
this.examid = examid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public double getGrade() {
return grade;
}
public void setGrade(double grade) {
this.grade = grade;
}
}
package exception;
public class StudentNotExistException extends Exception {
public StudentNotExistException() {
}
public StudentNotExistException(String message) {
super(message);
}
public StudentNotExistException(Throwable cause) {
super(cause);
}
public StudentNotExistException(String message,Throwable cause) {
super(message,cause);
}
public StudentNotExistException(String message,Throwable cause,boolean enableSuppression,boolean writableStackTrace) {
super(message,cause,enableSuppression,writableStackTrace);
}
}
package test;
import org.junit.Test;
import dao.StudentDao;
import domain.Student;
import exception.StudentNotExistException;
public class StudentDaoTest {
@Test
public void testAdd(){
StudentDao dao = new StudentDao();
Student s = new Student();
s.setExamid("121");
s.setGrade(89);
s.setIdcard("121");
s.setLocation("北京");
s.setName("aa");
dao.add(s);
}
@Test
public void testFind(){
StudentDao dao = new StudentDao();
dao.find("121");
}
@Test
public void testDelelte() throws StudentNotExistException{
StudentDao dao = new StudentDao();
dao.delete("aa");
}
}
package ui
import java.io.BufferedReader
import java.io.IOException
import java.io.InputStreamReader
import dao.StudentDao
import domain.Student
import exception.StudentNotExistException
public class Main {
public static void main(String[] args) {
System.out.println("添加用户(a) 删除用户(b) 查找学生")
System.out.print("请输入操作类型：")
BufferedReader br = new BufferedReader(new InputStreamReader(System.in))
try {
String type =br.readLine()
if("a".equals(type)){
System.out.println("请输出姓名")
String name = br.readLine()
System.out.println("请输出准考证号")
String examid = br.readLine()
System.out.println("请输出身份证号码")
String idcard = br.readLine()
System.out.println("请输出所在地")
String location = br.readLine()
System.out.println("请输出成绩")
String grade = br.readLine()
Student s = new Student()
s.setName(name)
s.setIdcard(idcard)
s.setExamid(examid)
s.setLocation(location)
s.setGrade(Double.parseDouble(grade))
StudentDao dao = new StudentDao()
dao.add(s)
}else if("b".equals(type)){
System.out.println("请输入删除学生")
String name = br.readLine()
StudentDao dao = new StudentDao()
try {
dao.delete(name)
System.out.println("删除成功")
} catch (StudentNotExistException e) {
// TODO Auto-generated catch block
System.out.println("删除的用户不存在")
}
}else if("c".equals(type)){
}else{
System.out.println("不支持的操作")
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace()
System.out.println("输入出错")
}
}
}
package utils
import java.io.FileNotFoundException
import java.io.FileOutputStream
import java.io.IOException
import javax.xml.parsers.DocumentBuilder
import javax.xml.parsers.DocumentBuilderFactory
import javax.xml.parsers.ParserConfigurationException
import javax.xml.transform.Transformer
import javax.xml.transform.TransformerConfigurationException
import javax.xml.transform.TransformerException
import javax.xml.transform.TransformerFactory
import javax.xml.transform.dom.DOMSource
import javax.xml.transform.stream.StreamResult
import org.w3c.dom.Document
import org.xml.sax.SAXException
import com.sun.xml.internal.bind.unmarshaller.DOMScanner
public class XmlUtils {
private static String filename = "src/exam.xml"
public static Document getDocument() throws ParserConfigurationException,SAXException,IOException{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance()
DocumentBuilder builder = factory.newDocumentBuilder()
return builder.parse(filename)
}
public static void write2Xml(Document docum) throws FileNotFoundException,TransformerException{
TransformerFactory factory = TransformerFactory.newInstance()
Transformer tf = factory.newTransformer()
tf.transform(new DOMSource(docum),new StreamResult(new FileOutputStream(filename)))
}
}
<?xml version="1.0" encoding="UTF-8" standalone="no"?><exam>
<student examid="222" idcard="111">
<name>张三</name>
<location>沈阳</location>
<grade>89</grade>
</student>
<student examid="444" idcard="333">
<name>李四</name>
<location>大连</location>
<grade>97</grade>
</student>
</exam>
