java IO学生管理系统（把数据存入文本）
package StudentManageIO;
public class Student {
int sno;
String sname;
int age;
String site;
@Override
public String toString() {
return sno + "," + sname + "," + age + "," + site;
}
public String toStringConsole() {
return sno + "\t" + sname + "\t" + age + "\t" + site+"\t";
}
public Student() {
}
public Student(int sno, String sname, int age, String site) {
this.sno = sno;
this.sname = sname;
this.age = age;
this.site = site;
}
public int getSno() {
return sno;
}
public void setSno(int sno) {
this.sno = sno;
}
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSite() {
return site;
}
public void setSite(String site) {
this.site = site;
}
}
文本存取数据：
package StudentManageIO;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
public class IoText {
static ArrayList arr = null;
static FileWriter fw = null;
static InputStreamReader reader = null;
static BufferedReader br = null;
static Student st = null;
public static void init() throws IOException {
fw = new FileWriter("text.txt");
fw.close();
}
public static ArrayList SelectText() throws IOException {// 查询学生
arr = new ArrayList<>();
File filename = new File("text.txt");//
reader = new InputStreamReader(new FileInputStream(filename));
br = new BufferedReader(reader); //
while (true) {
String line = br.readLine(); //
if (line != null) {
st = new Student();
String s[] = line.split(",");
st.setSno(Integer.parseInt(s[0]));
st.setSname(s[1]);
st.setAge(Integer.parseInt(s[2]));
st.setSite(s[3]);
arr.add(st);
} else {
break;
}
}
reader.close();
br.close();
return arr;
}
public static void AddText(String string) throws IOException {
fw = new FileWriter("text.txt", true);
fw.write(string.toString());
fw.write("\r\n");
fw.close();
}
public static void delText(int sno) throws IOException {//删除
File filename = new File("text.txt");//
reader = new InputStreamReader(new FileInputStream(filename));
br = new BufferedReader(reader); //
ArrayList lineString = new ArrayList<>();
int count = 1;
while (true) {
String line = br.readLine(); //
if (line != null) {
String s[] = line.split(",");
if (Integer.parseInt(s[0]) == sno) {
System.out.println("删除成功！");
count--;
} else
lineString.add(line);
} else {
break;
}
}
if (count == 1) {
System.out.println("删除失败！");
}
fw = new FileWriter("text.txt");
for (int i = 0; i < lineString.size(); i++) {
fw.write(lineString.get(i));
if (i != lineString.size() - 1)
fw.write("\r\n");
}
fw.close();
reader.close();
br.close();
}
public static void UpdateText(Student st) throws IOException {// 修改
arr = new ArrayList<>();
File filename = new File("text.txt");// 读数据
reader = new InputStreamReader(new FileInputStream(filename));
br = new BufferedReader(reader);
int count = 1;
while (true) {
String line = br.readLine(); // 读取每一行
if (line != null) {
String s[] = line.split(",");
if (Integer.parseInt(s[0]) == st.getSno()) {
st.setSno(Integer.parseInt(s[0]));
st.setSname(st.getSname());
st.setAge(st.getAge());
st.setSite(st.getSite());
System.out.println("修改成功");
count--;
}
arr.add(st);
} else {
break;
}
}
if (count == 1) {
System.out.println("修改失败！");
}
fw = new FileWriter("text.txt");
for (int i = 0; i < arr.size(); i++) {
fw.write(arr.get(i).toString());
if (i != arr.size() - 1)
fw.write("\r\n");
}
fw.close();
reader.close();
br.close();
}
} 用户数据操作
package StudentManageIO;
import java.util.ArrayList;
import java.util.Scanner;
public class Test {
static Scanner sc = null;
static ArrayList s = null;
static Student t = null;
public static void inputMessage() {
t = new Student();
System.out.print("请输入用户名 ：");
String sname = sc.next();
System.out.print("请输入年龄：");
int age = sc.nextInt();
System.out.print("请输入居住地：");
String site = sc.next();
t.setSname(sname);
t.setAge(age);
t.setSite(site);
}
public static void selcetStudent(ArrayList s) {// 查询学生
if (s.size() == 0)
System.out.println("不好意思,目前没有学生信息可供查询,请回去重新选择你的操作");
else {
System.out.println("学号\t姓名\t年龄\t居住地\t");
for (int i = 0; i < s.size(); i++) {
System.out.println(s.get(i).toString());
}
}
}
public static ArrayList addStudent(ArrayList s) {// 添加
sc = new Scanner(System.in);
System.out.print("请输入学号 ：");
int sno = sc.nextInt();
inputMessage();
t.setSno(sno);
s.add(t);
return s;
}
public static void delStudent(ArrayList s) {// 删除学生
sc = new Scanner(System.in);
System.out.println("请输入你要删除的学生的学号：");
int sno = sc.nextInt();
for (int i = 0; i < s.size(); i++) {
if (s.get(i).getSno() == sno) {
s.remove(i);
System.out.println("删除成功！");
break;
} else if (i == s.size() - 1)
System.out.println("该学生不存在！");
}
}
public static void updateStudent(ArrayList s) {// 修改学生
sc = new Scanner(System.in);
System.out.println("请输入你要修改的学生的学号：");
int sno = sc.nextInt();
for (int i = 0; i < s.size(); i++) {
if (s.get(i).getSno() == sno) {
inputMessage();
t.setSno(sno);
s.set(i, t);
System.out.println("修改成功！");
break;
} else if (i == s.size() - 1)
System.out.println("该学生不存在！");
}
}
public static void select() {
sc = new Scanner(System.in);
int select = 0;
while (select != 5) {
System.out.println("--------欢迎来到学生管理系统--------");
System.out.println("1.查看所有学生");
System.out.println("2.添加学生");
System.out.println("3.删除学生");
System.out.println("4.修改学生");
System.out.println("5.退出");
select = sc.nextInt();
switch (select) {
case 1:
selcetStudent(s);
break;
case 2:
addStudent(s);
break;
case 3:
delStudent(s);
break;
case 4:
updateStudent(s);
break;
case 5:
System.out.println("谢谢使用");
break;
default:
System.out.println("输入错误，重新选择！");
break;
}
}
}
public static void main(String[] args) {
s = new ArrayList<>();
select();
}
}