学生信息管理系统 Java
Menu.java
package studentmanagesystem;
public class Menu {
static void showFirst(){
System.out.println("+--------------学生信息管理系统--------------+");
System.out.println("|\t\t\t\t1.增加学员信息\t\t\t\t|");
System.out.println("|\t\t\t\t2.查找学员信息\t\t\t\t|");
System.out.println("|\t\t\t\t3.更新学员信息\t\t\t\t|");
System.out.println("|\t\t\t\t4.删除学员信息\t\t\t\t|");
System.out.println("|\t\t\t\t5.退出\t\t\t\t\t\t|");
System.out.println("+-------------------------------------------+");
}
static void showSecond(){
System.out.print("请选择操作项：(1)增加 (2)查找 (3)更新 (4)删除 (5)注销 ：");
}
}
Student.java
package studentmanagesystem;
public class Student {
String stuNo;
String name;
double score;
public String getStuNo() {
return stuNo;
}
public void setStuNo(String stuNo) {
this.stuNo = stuNo;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getScore() {
return score;
}
public void setScore(double score) {
this.score = score;
}
@Override
public String toString() {
return "学员信息：" +
"学号：" + stuNo +
" 姓名：" + name +
" 成绩：" + score +
'\n';
}
}
StudentManage.java
package studentmanagesystem;
import cn.hutool.poi.excel.ExcelReader;
import cn.hutool.poi.excel.ExcelUtil;
import cn.hutool.poi.excel.ExcelWriter;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.Scanner;
public class StudentManager {
static Scanner input = new Scanner(System.in);
//显示操作菜单
void showMenu(){
Menu.showFirst();
}
//开始方法
void start(){
showMenu();
int choose;
char answer;
do {
Menu.showSecond();
choose = input.nextInt();
switch (choose){
case 1:{
addStudent();
break;
}
case 2:{
char answer2;
do {
System.out.print("请输入学号：");
String stuNo = input.next();
Student student=findByNo(stuNo);
if(student.getStuNo()==null)
System.out.println("没有学号为"+stuNo+"的学生。");
else System.out.println(student);
System.out.print("是否继续查找(y/n):");
answer2=input.next().charAt(0);
}while (answer2!='n');
break;
}
case 3:{
char answer3;
do {
Student student = inputInfo();
updateStudent(student);
System.out.println("学生信息更新成功！");
System.out.print("是否继续更新(y/n):");
answer3=input.next().charAt(0);
}while (answer3!='n');
break;
}
case 4:{
char answer4;
do {
System.out.print("请输入学号：");
String stuNo = input.next();
if (removeStudent(stuNo)) {
System.out.println("删除成功！");
}
else System.out.println("删除失败！没有学号为"+stuNo+"的学生信息");
System.out.print("是否继续删除(y/n):");
answer4=input.next().charAt(0);
}while (answer4!='n');
break;
}
case 5:{
System.out.println("谢谢使用！");
return;
}
}
System.out.print("返回操作菜单(y/n):");
answer=input.next().charAt(0);
if (answer=='y'){
Menu.showFirst();
}
}while (true);
}
//添加学生对象到数组中
void addStudent(){
char answer;
do {
ExcelReader excelReader = ExcelUtil.getReader("E:\\蓝桥\\Java初级\\学生信息.xlsx");
ExcelWriter excelWriter = ExcelUtil.getWriter("E:\\蓝桥\\Java初级\\学生信息.xlsx");
Student student = inputInfo();
excelWriter.writeCellValue(0, excelReader.getRowCount(),student.getStuNo());
excelWriter.writeCellValue(1, excelReader.getRowCount(),student.getName());
excelWriter.writeCellValue(2, excelReader.getRowCount(),student.getScore());
excelWriter.flush();
excelWriter.close();
System.out.println("增加学员成功！");
System.out.println(student);
System.out.print("是否继续增加(y/n):");
answer=input.next().charAt(0);
}while (answer!='n');
}
//通过学号查找学员
Student findByNo(String stuNo){
ExcelReader excelReader=ExcelUtil.getReader("E:\\蓝桥\\Java初级\\学生信息.xlsx");
List<List<Object>> students = excelReader.read();
Student student1=new Student();
for (List<Object> student : students) {
if (stuNo.equals(student.get(0))) {
student1.setStuNo((String)student.get(0));
student1.setName((String)student.get(1));
student1.setScore((double)student.get(2));
break;
}
}
return student1;
}
//输入学生信息，并返回学生对象
Student inputInfo(){
Student student=new Student();
System.out.print("请输入学号：");
student.stuNo = input.next();
System.out.print("请输入学生姓名：");
student.name = input.next();
System.out.print("请输入成绩：");
student.score = input.nextDouble();
return student;
}
void updateStudent(Student student){
ExcelWriter excelWriter= ExcelUtil.getWriter("E:\\蓝桥\\Java初级\\学生信息.xlsx");
ExcelReader excelReader=ExcelUtil.getReader("E:\\蓝桥\\Java初级\\学生信息.xlsx");
int rowCount = excelReader.getRowCount();
for (int i = 1; i < rowCount; i++) {
List<Object> row = excelReader.readRow(i);
if (row.get(0).equals(student.getStuNo())) {
excelWriter.writeCellValue(0, i,student.getStuNo());
excelWriter.writeCellValue(1, i,student.getName());
excelWriter.writeCellValue(2, i,student.getScore());
excelWriter.flush();
excelWriter.close();
return;
}
}
}
boolean removeStudent(String stuNo){
ExcelReader excelReader = ExcelUtil.getReader("E:\\蓝桥\\Java初级\\学生信息.xlsx");
int rowCount = excelReader.getRowCount();
int i;
boolean isfind=false;
for (i = 1; i < rowCount; i++) {
List<Object> row = excelReader.readRow(i);
if (row.get(0).equals(stuNo)) {
isfind=true;
break;
}
}
if (!isfind) {
return false;
}
for (int j = i+1; j < rowCount; j++) {
ExcelWriter excelWriter = ExcelUtil.getWriter("E:\\蓝桥\\Java初级\\学生信息.xlsx");
List<Object> row = excelReader.readRow(j);
excelWriter.writeCellValue(0, j-1,row.get(0));
excelWriter.writeCellValue(1, j-1,row.get(1));
excelWriter.writeCellValue(2, j-1,row.get(2));
excelWriter.flush();
excelWriter.close();
}
ExcelReader excelReader1 = ExcelUtil.getReader("E:\\蓝桥\\Java初级\\学生信息.xlsx");
Workbook workbook=excelReader1.getWorkbook();
Sheet sheet=workbook.getSheetAt(0);
Row row=sheet.getRow(rowCount-1);
sheet.removeRow(row);
try {
workbook.write(new FileOutputStream("E:\\蓝桥\\Java初级\\学生信息1.xlsx"));
workbook.close();
}catch (IOException e){
e.printStackTrace();
}
return true;
}
public static void main(String[] args) {
StudentManager studentManager=new StudentManager();
studentManager.start();
}
}