StudentManageSystem（学生管理系统）

//学生管理系统，利用IO实现
import java.util.Arrays;public class Student {private String name;private String id;private String gender;private int age;private double weight;private double hight;private String[] hobby;public Student() {}public Student(String name, String id,String gender, int age, double weight, double hight, String[] hobby) {this.name = name;this.id = id;this.gender = gender;this.age = age;this.weight = weight;this.hight = hight;this.hobby = hobby;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getGender() {return gender;}public void setGender(String gender) {this.gender = gender;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public double getWeight() {return weight;}public void setWeight(double weight) {this.weight = weight;}public double getHight() {return hight;}public void setHight(double hight) {this.hight = hight;}public String[] getHobby() {return hobby;}public void setHobby(String[] hobby) {this.hobby = hobby;}public String getId() {return id;}public void setId(String id) {this.id = id;}@Overridepublic String toString() {return "Student{" +"name='" + name + '\'' +", id='" + id + '\'' +", gender='" + gender + '\'' +", age=" + age +", weight=" + weight +", hight=" + hight +", hobby=" + Arrays.toString(hobby) +'}';}
}

student类对象

下面利用了IO流来实现导入student.txt文件里面的信息

student.txt的内容

李响 2109124001 男 19 200.0 185.0 踢足球,玩手机
李佳豪 2109124002 男 18 178.0 120.0 打游戏,写代码
李佳豪 2109124003 男 20 183.0 150.0 写代码,弹吉他,旅游,拍风景
黄彦鑫 2109124004 男 21 120.0 168.0 刷抖音,旅游,爬山
常妍雨 2109124005 女 19 110.0 168.0 绝地求生,追剧,写代码
郝少杰 2109214007 男 19 120.0 178.0 打游戏,刷抖音,学习
王佳和 2109124012 男 20 200.0 185.0 学习,开车
吕佳俊 2109124018 男 19 100.0 180.0 学习,数学,C++
赵凯悦 2109124022 男 19 160.0 178.0 算法,java,听歌
郑梓桐 2109124027 男 19 160.0 180.0 java,打篮球

import java.io.*;
import java.util.ArrayList;
import java.util.Scanner;/*** 利用字符缓冲输出输入流对象实现* IO流将StudentInfo文件中的数据导出来，然后更改，继续写入文件*/public class Arrays {//主函数public static void main(String[] args) throws Exception{Scanner sc = new Scanner(System.in);ArrayList<Student> student = read();pro();System.out.print("请输入功能数字：");int num = sc.nextInt();while (num!=0) {switch (num) {case 0:num=0;break;case 1:student.add(wir());break;case 2:select(student);break;case 3:delete(student);break;case 4:Update(student);break;case 5:show();break;}System.out.print("请再次输入数字：");pro();num=sc.nextInt();}}//更新修改学生信息public static void Update(ArrayList<Student> s) throws Exception {System.out.print("请输入需要修改人的学号：");Scanner sc = new Scanner(System.in);String id = sc.next();for (Student student : s) {if(student.getId().equals(id)){pro2();System.out.print("请输入需要修改的项目的序号：");int num = sc.nextInt();while (num!=0){switch (num){case 0:break;case 1:UpdateName(student);WriteInTxt(s);break;case 2:UpdateId(student);WriteInTxt(s);break;case 3:UpdateGenderStudent(student);WriteInTxt(s);break;case 4:UpdateAge(student);WriteInTxt(s);break;case 5:UpdateWeight(student);WriteInTxt(s);break;case 6:UpdateHight(student);WriteInTxt(s);break;case 7:UpdateHobby(student);WriteInTxt(s);break;}System.out.println();pro2();System.out.print("请输入需要修改的项目的序号：");num= sc.nextInt();}}}}//更新列表消息public static void pro2(){System.out.println("功能");System.out.println("0，退出");System.out.println("1，姓名");System.out.println("2，学号");System.out.println("3，性别");System.out.println("4，年龄");System.out.println("5，重量");System.out.println("6，身高");System.out.println("7，爱好");}//更新爱好public static Student UpdateHobby(Student s){Scanner sc = new Scanner(System.in);System.out.print("请输入新的爱好:");String str = sc.next();String[] split = str.split(",");s.setHobby(split);return s;}//更新身高public static Student UpdateHight(Student s){Scanner sc = new Scanner(System.in);System.out.print("请输入新的身高:");s.setHight(sc.nextDouble());return s;}//更新体重public static Student UpdateWeight(Student s){Scanner sc = new Scanner(System.in);System.out.print("请输入新的体重:");s.setWeight(sc.nextDouble());return s;}//更新年龄public static Student UpdateAge(Student s){Scanner sc = new Scanner(System.in);System.out.print("请输入新的年龄:");s.setAge(sc.nextInt());return s;}//更新性别public static Student UpdateGenderStudent(Student s){Scanner sc = new Scanner(System.in);System.out.print("请输入新的性别:");s.setGender(sc.next());return s;}//更新IDpublic static Student UpdateId(Student s){Scanner sc = new Scanner(System.in);System.out.print("请输入新的学号:");s.setId(sc.next());return s;}//更新名字public static Student UpdateName(Student s){Scanner sc = new Scanner(System.in);System.out.print("请输入新的名字:");s.setName(sc.next());return s;}//写入文件public static void WriteInTxt(ArrayList<Student> s) throws Exception{BufferedWriter bw = new BufferedWriter(new FileWriter("StudentInfo.txt"));for (Student student : s) {String a = null;StringBuffer b = new StringBuffer();for(int i=0;i<student.getHobby().length;i++){b.append(student.getHobby()[i]);if(i!= student.getHobby().length-1){b.append(",");}}bw.write(student.getName()+" "+student.getId()+" "+student.getGender()+" "+student.getAge()+" "+student.getWeight()+" "+student.getHight()+" "+b.toString());bw.newLine();bw.flush();}}//功能函数public static void pro(){System.out.println("功能");System.out.println("0，退出");System.out.println("1，添加学生");System.out.println("2，查找学生");System.out.println("3，删除学生");System.out.println("4，更改学生信息");System.out.println("5，打印全部学生信息");}//展示文件信息public static void show() throws Exception{BufferedReader br = new BufferedReader(new FileReader("StudentInfo.txt"));String line = null;while((line=br.readLine())!=null){System.out.println(line);}}//删除public static void delete(ArrayList<Student> s) throws Exception{Scanner sc = new Scanner(System.in);BufferedWriter bw = new BufferedWriter(new FileWriter("StudentInfo.txt"));System.out.println("请输入需要删除的人的姓名");String name = sc.next();for(int i =0 ;i<s.size();i++){if(s.get(i).getName().equals(name)){s.remove(i);System.out.println("删除成功");}}for (Student student : s) {String a = null;StringBuffer b = new StringBuffer();for(int i=0;i<student.getHobby().length;i++){b.append(student.getHobby()[i]);if(i!= student.getHobby().length-1){b.append(",");}}bw.write(student.getName()+" "+student.getId()+" "+student.getGender()+" "+student.getAge()+" "+student.getWeight()+" "+student.getHight()+" "+b.toString());bw.newLine();bw.flush();}}//查找public static void select(ArrayList<Student> s){Scanner sc = new Scanner(System.in);System.out.println("请输入查找关键字（姓名 学号 性别 年龄 重量 身高 爱好 或者 全部信息）");String next = sc.next();switch (next){case "姓名":System.out.print("请输入要查找的姓名：");String name = sc.next();SelectByName(s, name);break;case "学号":System.out.print("请输入要查找的学号：");String id = sc.next();SelectById(s,id);break;case "性别":System.out.print("请输入要查找的性别：");String sex = sc.next();SelectBySex(s, sex);break;case "年龄":System.out.print("请输入要查找的年龄：");int age = sc.nextInt();SelectByAge(s, age);break;case "重量":System.out.print("请输入要查找的重量：");double weight = sc.nextDouble();SelectByWeight(s,weight);break;case "身高":System.out.print("请输入要查找的身高：");double hight = sc.nextDouble();SelectByHeight(s,hight);break;case "爱好":System.out.print("请输入要查找的爱好：");String s1 = sc.nextLine();SelectByHobby(s,s1);break;case "全部信息":System.out.print("请输入要查找的姓名：");Student s2 = new Student();s2.setName(sc.next());System.out.print("请输入要查找的学号：");s2.setId(sc.next());System.out.print("请输入要查找的性别：");s2.setGender(sc.next());System.out.print("请输入要查找的年龄：");s2.setAge(sc.nextInt());System.out.print("请输入要查找的重量：");s2.setWeight(sc.nextDouble());System.out.print("请输入要查找的身高：");s2.setHight(sc.nextDouble());System.out.print("请输入要查找的爱好：");String n = sc.next();String[] split = n.split(",");s2.setHobby(split);SelectByAll(s,s2);}}//查找全部public static void SelectByAll(ArrayList<Student> s,Student s1){int flag = 0;for (Student student : s) {if(s1.toString().equals(student.toString())){System.out.println(student);flag=1;}}if(flag==0){System.out.println("!!!数据文件里面没有要查找的人!!!");System.out.println();}}//查找爱好public static void SelectByHobby(ArrayList<Student> s ,String h){String[] split = h.split(" ");String s1 = split.toString();System.out.println(s1);int flag = 0;for (Student student : s) {if(s1.equals(student.getHobby().toString())){System.out.println(student);flag=1;}}if(flag==0){System.out.println("!!!数据文件里面没有要查找的人!!!");System.out.println();}}//查找身高private static void SelectByHeight(ArrayList<Student> s ,double w) {int flag = 0;for (Student student : s) {if(w==student.getHight()){System.out.println(student);flag=1;}}if(flag==0){System.out.println("!!!数据文件里面没有要查找的人!!!");System.out.println();}}//    查找体重private static void SelectByWeight(ArrayList<Student> s ,double w) {int flag = 0;for (Student student : s) {if(w==student.getWeight()){System.out.println(student);flag=1;}}if(flag==0){System.out.println("!!!数据文件里面没有要查找的人!!!");System.out.println();}}//    查找年龄private static void SelectByAge(ArrayList<Student> s ,int age) {int flag = 0;for (Student student : s) {if(age==student.getAge()){System.out.println(student);flag=1;}}if(flag==0){System.out.println("!!!数据文件里面没有要查找的人!!!");System.out.println();}}//    查找性别private static void SelectBySex(ArrayList<Student> s ,String sex) {int flag = 0;for (Student student : s) {if(sex.equals(student.getGender())){System.out.println(student);flag=1;}}if(flag==0){System.out.println("!!!数据文件里面没有要查找的人!!!");System.out.println();}}//    查找idprivate static void SelectById(ArrayList<Student> s ,String id) {int flag = 0;for (Student student : s) {if(id.equals(student.getId())){System.out.println(student);flag=1;}}if(flag==0){System.out.println("!!!数据文件里面没有要查找的人!!!");System.out.println();}}//    查找名字public static void SelectByName(ArrayList<Student> s ,String next){int flag = 0;for (Student student : s) {if(next.equals(student.getName())){System.out.println(student);flag=1;}}if(flag==0){System.out.println("!!!数据文件里面没有要查找的人!!!");System.out.println();}}//    由文件中读取出来，返回一个ArrayList集合public static ArrayList<Student> read() throws Exception {BufferedReader br = new BufferedReader(new FileReader("StudentInfo.txt"));String line;ArrayList<Student> student = new ArrayList<>();//将学生信息由StudentInfo中读取进来，加载进ArrayList中while((line=br.readLine())!=null){Student Stu = new Student();String[] s = line.split(" ");String[] split = s[s.length-1].split(",");Stu.setName(s[0]);Stu.setId(s[1]);Stu.setGender(s[2]);Stu.setAge(Integer.parseInt(s[3]));Stu.setWeight(Double.parseDouble(s[4]));Stu.setHight(Double.parseDouble(s[5]));Stu.setHobby(split);student.add(Stu);}return student;}//写入或者加入一个学生对象public static Student wir() throws Exception{Scanner sc = new Scanner(System.in);BufferedWriter bw = new BufferedWriter(new FileWriter("StudentInfo.txt",true));Student stu = new Student();System.out.println("请输入学生的信息（按照 姓名 学号 性别 年龄 重量 身高 爱好填写）");//写入文件String info = sc.nextLine();bw.write(info);bw.newLine();bw.flush();bw.close();//加载成对象Student Stu = new Student();String[] s = info.split(" ");String[] split = s[s.length-1].split(",");Stu.setName(s[0]);Stu.setId(s[1]);Stu.setGender(s[2]);Stu.setAge(Integer.parseInt(s[3]));Stu.setWeight(Double.parseDouble(s[4]));Stu.setHight(Double.parseDouble(s[5]));Stu.setHobby(split);return Stu;}
}

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