利用java语言，用IO传输数据的方式，写一个学生后台管理系统，数据需要持久化保存在本地磁盘上。（仅留底）
包com.gao
类StudentManagerMain
package com.gao;
import java.io.File;
import java.io.IOException;
import com.gao.controller.StudentHandler;
public class StudentManagerMain {
public static void main(String[] agrs) throws IOException {
String path = "D:/student.txt";
File file=new File(path);
file.createNewFile();
while (true) {
System.out.println("-----主界面-----");
System.out.println("1.查看所有学生信息");
System.out.println("2.添加学生信息");
System.out.println("3.删除学生信息");
System.out.println("4.修改学生信息");
System.out.println("5.查看单个学生信息");
System.out.println("6.退出系统");
System.out.println("");
String choice = StudentHandler.input("请输入你的选择");
switch (choice) {
case "1":
StudentHandler.queryAllStudent(path);
break;
case "2":
StudentHandler.addStudent(path);
break;
case "3":
StudentHandler.removeStudent(path);
break;
case "4":
StudentHandler.updateStudent(path);
break;
case "5":
StudentHandler.queryoneStudent(path);
break;
case "6":
default:
System.out.println("谢谢使用");
System.exit(0);
}
}
}
}
包com.gao.bean
类Student
package com.gao.bean;
public class Student {
// 学号
private String uid;
// 姓名
private String name;
// 年龄
private String age;
// 地址ַ
private String adress;
public Student() {
}
public Student(String uid, String name, String age, String adress) {
super();
this.uid = uid;
this.name = name;
this.age = age;
this.adress = adress;
}
public void setUid(String uid) {
this.uid = uid;
}
public String getUid() {
return uid;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setAge(String age) {
this.age = age;
}
public String getAge() {
return age;
}
public String getAdress() {
return adress;
}
public void setAdress(String adress) {
this.adress = adress;
}
@Override
public String toString() {
return uid + "," + name + "," + age + "," + adress;
}
}
包com.gao.controller
类StudentHandler
package com.gao.controller;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import com.gao.bean.Student;
import com.gao.modules.StudentFile;
public class StudentHandler {
public static void queryAllStudent(String path) {
List list = new ArrayList();
StudentFile.readStudent(path, list);
if (list.size() == 0) {
System.out.println("没有学生信息");
return;
}
System.out.println("学号t姓名t年龄t住址");
for (int i = 0; i < list.size(); i++) {
Student stu = list.get(i);
System.out.println(stu.getUid() + "t" + stu.getName() + "t" + stu.getAge() + "t" + stu.getAdress());
}
}
public static void queryoneStudent(String path) {
List list = new ArrayList();
StudentFile.readStudent(path, list);
String id = input("请输入你要查询的学生学号:");
for (int i = 0; i < list.size(); i++) {
Student stu = list.get(i);
if (stu.getUid().equals(id) == true) {
System.out.println("学号t姓名t年龄t住址");
System.out.println(stu.getUid() + "t" + stu.getName() + "t" + stu.getAge() + "t" + stu.getAdress());
}
}
}
public static void addStudent(String path) {
List list = new ArrayList();
StudentFile.readStudent(path, list);
boolean flag = false;
String id = input("请输入学号:");
while (true) {
for (int i = 0; i < list.size(); i++) {
if (list.get(i).getUid().equals(id)) {
flag = true;
break;
} else {
flag = false;
}
}
if (flag) {
System.out.println("学号重复，请重新输入");
} else {
break;
}
}
String name = input("请输入姓名:");
String age = input("请输入年龄:");
String adr = input("请输入地址:");
Student stu = new Student();
stu.setUid(id);
stu.setName(name);
stu.setAge(age);
stu.setAdress(adr);
list.add(stu);
StudentFile.writeData(path, list);
System.out.println("添加成功");
}
public static void updateStudent(String path) {
List list = new ArrayList();
StudentFile.readStudent(path, list);
int index = -1;
while (true) {
String id = input("请输入学号:");
for (int i = 0; i < list.size(); i++) {
Student stu = list.get(i);
if (stu.getUid().equals(id)) {
index = i;
break;
}
}
if (index >= 0) {
String name = input("请输入姓名:");
String age = input("请输入年龄:");
String adr = input("请输入地址:");
Student stu = new Student();
stu.setUid(id);
stu.setName(name);
stu.setAge(age);
stu.setAdress(adr);
list.set(index, stu);
StudentFile.writeData(path, list);
System.out.println("修改成功");
break;
} else {
System.out.println("没有此学号，请重新输入");
}
}
}
public static void removeStudent(String path) {
List list = new ArrayList();
StudentFile.readStudent(path, list);
while (true) {
String id = input("请输入你要删除的学生学号:");
int index = -1;
for (int i = 0; i < list.size(); i++) {
Student stu = list.get(i);
if (stu.getUid().equals(id)) {
index = i;
break;
}
}
if (index >= 0) {
list.remove(index);
StudentFile.writeData(path, list);
System.out.println("删除成功");
break;
} else {
System.out.println("没有此学号，请重新输入");
}
}
}
@SuppressWarnings("resource")
public static String input(String msg) {
Scanner sc = new Scanner(System.in);
System.out.println(msg);
return sc.nextLine();
}
}
包com.gao.modules
类StudentFile
package com.gao.modules;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.List;
import com.gao.bean.Student;
import com.gao.modules.StudentFile;
public class StudentFile {
public static void readStudent(String path, List list) {
BufferedReader bufferedReader = null;
try {
bufferedReader = new BufferedReader(new FileReader(path));
String line;
while ((line = bufferedReader.readLine()) != null) {
String[] str = line.split(",");
Student student = new Student();
student.setUid(str[0]);
student.setName(str[1]);
student.setAge(str[2]);
student.setAdress(str[3]);
list.add(student);
}
} catch (IOException e) {
e.printStackTrace();
}
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void writeData(String path, List list) {
BufferedWriter bufferedWriter = null;
try {
bufferedWriter = new BufferedWriter(new FileWriter(path));
for (int i = 0; i < list.size(); i++) {
Student student = list.get(i);
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append(student.getUid() + "," + student.getName() + "," + student.getAge() + ","
+ student.getAdress());
bufferedWriter.write(stringBuilder.toString());
bufferedWriter.newline();
bufferedWriter.flush();
}
} catch (IOException e) {
e.printStackTrace();
}
try {
bufferedWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
