使用java语言用本地文件存储数据实现学生信息管理系统，在控制台上编译执行，也就是学生管理系统IO版
可以实现基本的学生信息增加、删除、修改、查询功能（细化了查询功能）
集合版可以参考我的另外一篇博文。
代码如下
StudentManager
提供用户界面
import java.io.IOException;
import java.util.Scanner;
public class StudentManager {
public static void main(String[] args) throws IOException, ClassNotFoundException {
while (true) {
Scanner sc = new Scanner(System.in);
System.out.println();
System.out.println();
System.out.println("=================================");
System.out.println("=========欢迎使用学生管理系统 =========");
System.out.println("=========请选择您要进行的操作 =========");
System.out.println("= 1 添加学生信息 =");
System.out.println("= 2 删除学生信息 =");
System.out.println("= 3 修改学生信息 =");
System.out.println("= 4 查询学生信息 =");
System.out.println("= 5 退出系统 =");
System.out.println("==================================");
System.out.println("请输入您的选择");
int choose;
if (sc.hasNextInt()) {
choose = sc.nextInt();
if (choose > 0 && choose < 6) {
StudentDAO std = new StudentDAO();
switch (choose) {
case 1:
std.add();
break;
case 2:
std.del();
break;
case 3:
std.update();
break;
case 4:
std.query();
break;
case 5:
System.out.println("成功退出……");
System.out.println("欢迎下次使用");
System.exit(0);
break;
}
} else {
System.out.println("请正确输入");
}
} else {
System.out.println("请您输入正确的选项");
}
}
}
}
Student类
public class Student implements Serializable{
private static final long serialVersionUID = 3420928184417313845L;
private String stuNo;
private String name;
private int age;
public Student() {
super();
// TODO Auto-generated constructor stub
}
public Student(String stuNo, String name, int age) {
super();
this.stuNo = stuNo;
this.name = name;
this.age = age;
}
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 int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + age;
result = prime * result + ((name == null) ? 0 : name.hashCode());
result = prime * result + ((stuNo == null) ? 0 : stuNo.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Student other = (Student) obj;
if (age != other.age)
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (stuNo == null) {
if (other.stuNo != null)
return false;
} else if (!stuNo.equals(other.stuNo))
return false;
return true;
}
@Override
public String toString() {
return "学生：学号 " + stuNo + ", 姓名 " + name + ", 年龄 " + age ;
}
}
IOUtil类
用于从文件中读写信息到集合
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
public class IOUtil {
//读取文件信息
public static ArrayList readStu() {
ArrayList stuList = null;
File file = new File("test.txt");
if (!file.exists()) {
try {
file.createNewFile();
} catch (Exception e) {
e.printStackTrace();
}
}
try (
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
) {
stuList = (ArrayList) ois.readObject();
} catch (Exception e) {
e.printStackTrace();
}
return stuList;
}
//写入文件信息
public static void writeStu(ArrayList stu) {
try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(new File("test.txt")));
) {
oos.writeObject(stu);
} catch (Exception e) {
e.printStackTrace();
}
}
}
StudentDAO
用于执行数据的增删改查操作
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.Scanner;
public class StudentDAO {
static Scanner sc = new Scanner(System.in);
// 增加学生信息
public void add() throws IOException, ClassNotFoundException {
ArrayList list = IOUtil.readStu();
// 学号自增
String stuNo = null;
a: while (true) {
// 如果不存在学生则学号为1000
if (list.size() == 0) {
stuNo = "1000";
} else {
// 创建新的学号，让新的学号在列表中的最后一个学生学号的基础上加1
int sNo = Integer.parseInt(list.get(list.size() - 1).getStuNo()) + 1;
// 将学号类型转为String类型
stuNo = String.valueOf(sNo);
}
System.out.println("请输入你要添加的学号为" + stuNo + "的学生的姓名");
String name = sc.next();
while (true) {
System.out.println("请输入你要添加的学号为" + stuNo + "的学生的年龄");
Scanner sc1 = new Scanner(System.in);
if (sc1.hasNextInt()) {
int age = sc1.nextInt();
list.add(new Student(stuNo, name, age));
IOUtil.writeStu(list);
break;
} else {
System.out.println("请正确输入");
continue a;
}
}
System.out.println("学号为" + stuNo + "的学生信息添加成功");
System.out.println("添加信息后,学生的信息为：");
showStudentInformation();
System.out.println("是否继续执行添加操作(y/n)");
String result = sc.next();
if (result.equalsIgnoreCase("n") || result.equalsIgnoreCase("y")) {
if (result.equalsIgnoreCase("n")) {
break;
}
} else {
}
}
}
// 删除学生信息
public void del() throws IOException, ClassNotFoundException {
ArrayList list = IOUtil.readStu();
if (list.size() != 0) {
a: while (true) {
showStudentInformation();
System.out.println("请输出你要删除的学生的学号");
String str = sc.next();
Iterator it = list.iterator();
while (it.hasNext()) {
Student stu = it.next();
if (stu.getStuNo().equals(str)) {
it.remove();
System.out.println("删除成功!");
System.out.println("删除操作后,学生的信息为：");
IOUtil.writeStu(list);
showStudentInformation();
break a;// 跳出到指定循环外
}
}
System.out.println("查无此人……请查证后重新输入");
}
} else {
System.out.println("还没有添加学生信息，快去添加学生信息吧");
}
}
// 修改学生信息
public void update() {
ArrayList list = IOUtil.readStu();
if (list.size() != 0) {
a: while (true) {
showStudentInformation();
System.out.println("请输入要修改学生的学号：");
String stuNo = sc.next();
ListIterator lit = list.listIterator();
while (lit.hasNext()) {
Student stu = lit.next();
if (stu.getStuNo().equals(stuNo)) {
System.out.println("请输入您要修改的学生的姓名");
String name = sc.next();
System.out.println("请输入您要修改的学生的年龄");
if (sc.hasNextInt()) {
int age = sc.nextInt();
stu.setName(name);
stu.setAge(age);
System.out.println("修改操作后,学生的信息为：");
IOUtil.writeStu(list);
showStudentInformation();
break a;
} else {
System.out.println("请正确输入年龄");
}
}
}
System.out.println("查无此人……请查证后重新输入");
}
} else {
System.out.println("还没有添加学生信息，快去添加学生信息吧");
}
}
// 显示学生信息
public void showStudentInformation() {
ArrayList list = IOUtil.readStu();
if (list.size() != 0) {
System.out.println("=============学生信息==============");
for (Student stu : list) {
System.out.println(stu);
}
System.out.println("=================================");
} else {
System.out.println("还没有添加学生信息，快去添加学生信息吧");
}
}
// 查询学生信息
public void query() {
ArrayList list = IOUtil.readStu();
if (list.size() != 0) {
int choose = 0;
while (true) {
System.out.println("请选择您的查询条件:1.查询全部 2.学号 3.姓名 4.年龄");
System.out.println("请输入您的选择");
try {
choose = sc.nextInt();
break;
} catch (Exception e) {
System.out.println("请重新输入选择");
sc = new Scanner(System.in);
}
}
switch (choose) {
case 1:
System.out.println("=============学生信息==============");
for (Student stu : list) {
System.out.println(stu);
}
System.out.println("=================================");
break;
case 2: {
queryStuNo(list);
break;
}
case 3:
queryStuName(list);
break;
case 4:
queryStuAge(list);
break;
default:
System.out.println("查询条件不正确，正在退出查询……");
break;
}
} else {
System.out.println("还没有添加学生信息，快去添加学生信息吧");
}
}
// 按学号查询
public static void queryStuNo(ArrayList list) {
a: while (true) {
System.out.println("请输入您要查询的学号");
String stuNo = sc.next();
for (Student student : list) {
if ((student.getStuNo()).equals(stuNo)) {
System.out.println(student);
break a;
}
}
System.out.println("查无此人……请查证后重新输入");
}
}
// 按姓名查询
public static void queryStuName(ArrayList list) {
while (true) {
ArrayList list1 = new ArrayList<>();
System.out.println("请输入您要查询的姓名");
String stuName = sc.next();
for (Student student : list) {
if ((student.getName()).equals(stuName)) {
list1.add(student);
}
}
if (list1.size() == 0) {
System.out.println("查无此人……请查证后重新输入");
} else {
// 遍历集合
for (Student student : list1) {
System.out.println(student);
}
break;
}
}
}
// 按年龄查询
public static void queryStuAge(ArrayList list) {
while (true) {
ArrayList list1 = new ArrayList<>();
int age;
System.out.println("请输入您要查询的年龄");
while (true) {
try {
age = sc.nextInt();
break;
} catch (Exception e) {
System.out.println("请重新输入年龄");
sc = new Scanner(System.in);
}
}
for (Student student : list) {
if (student.getAge() == age) {
list1.add(student);
}
}
if (list1.size() == 0) {
System.out.println("没有此年龄的人，请重新查找");
} else {
// 遍历集合
for (Student student : list1) {
System.out.println(student);
}
break;
}
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。