文件目录

#userDoa

package doa;//doa操作文档的

import sun.security.util.Password;

import java.io.*;

public class UserDoa {
    //用户的注册
    public static boolean UserRegisrer(String username, String psw) {
        boolean u = false;
        BufferedWriter bf = null;
        try {
            String temp = "";
            bf = new BufferedWriter(new FileWriter("D:\\javad\\java_______________code\\Userlogin\\src\\user.txt"));
            bf.write("username=" + username);
            bf.newLine();
            bf.write("password=" + psw);
            u = true;
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            try {
                if (bf != null) {
                    bf.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return u;
    }

    //用户登录
    public static boolean userLogin(String username, String psw) {
        System.out.println("开始登录");
        boolean rst = false;
        BufferedReader br = null;
        String line = null;
        boolean ub = false;
        boolean pb = false;
        try {
            br = new BufferedReader(new FileReader("D:\\javad\\java_______________code\\Userlogin\\src\\user.txt"));
            while ((line = br.readLine()) != null) {
                if (line.equals("username=" + username))//是名字才会比对。
                {
                    System.out.println("ERROR1");

                    ub = true;
                }
                if (line.equals("password=" + psw)) {
                    System.out.println("ERROR2");

                    pb = true;
                }
            }
            if (ub && pb) {
                System.out.println("成功");
                rst = true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null) {
                    br.close();
                }
            } catch (Exception q) {
                q.printStackTrace();
            }
        }

        return rst;

    }

    //修改密码
    public static boolean caangepsw(String oldpsw, String psw) {
        FileWriter fw = null;
        BufferedWriter bw = null;
        try {
            fw = new FileWriter("D:\\javad\\java_______________code\\Userlogin\\src\\user.txt", true); // 传一个true，表示添加数据的方式是追加
            bw = new BufferedWriter(fw);
            bw.newLine();
            bw.write("password=" + psw);
            bw.flush();
            System.out.println("修改成功！");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bw == null) {
                try {
                    bw.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return true;
    }


    //注销
    public static boolean withdraws() {

        BufferedWriter bw = null;
        try {
            bw = new BufferedWriter(new FileWriter("D:\\javad\\java_______________code\\Userlogin\\src\\user.txt"));
            bw.write("");
            bw.flush();
            System.out.println("注销成功");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {

                try {
                    if (bw == null) {
                        bw.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }return  true;
        }

    }







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userservlet

package servlet;//方法入口，调用以及交互

import doa.UserDoa;

import java.util.Scanner;

public class UserServlet {
    public static void main(String[] args) {
        //注册
        registered();
        //   登录
            boolean bl = false;
            bl = login();
            if (bl) {
                System.out.println("登录成功");

            } else {
                System.out.println("登录失败，请修改密码");
                caangepsws();   //修改秘密
            }
        withdraw();      //注销
    }
      //修改密码
        public static boolean caangepsws()
        {    System.out.println("是否要修改密码，,输入0为否定，其他数字为肯定");
            Scanner input = new Scanner(System.in);//用于接收各种数据类型,需要导入.util包。
            boolean b=false;
            int j = input.nextInt();//接收不同类型的数据
            if(j!=0)
            {
                String oldpsw = null;
                String newpsw = null;
                UserDoa userDoa = new UserDoa();
                System.out.println("请输入原始密码");
                Scanner scnne = new Scanner(System.in);
                oldpsw = scnne.nextLine();
                System.out.println("请输入新密码");
                newpsw = scnne.nextLine();
                b = UserDoa.caangepsw(oldpsw, newpsw);
            }
            else{
                System.out.println("欢迎下次使用");
            }
            return  true;
        }
      //登录
    public static boolean login() {
        boolean e = false;
        String username = null;
        String psw = null;
        UserDoa userDoa = new UserDoa();
        Scanner scnner = new Scanner(System.in);
        System.out.println("请输入用户名");

        username = scnner.nextLine();
        System.out.println("请输入密码");
        psw = scnner.nextLine();
        e = UserDoa.userLogin(username, psw);
        // System.out.println(e);
        return e;
    }

    //创建
    public static boolean registered()
    {boolean w=false;
        String username = null;
        String psw = null;
        UserDoa userDoa = new UserDoa();
        Scanner scnner = new Scanner(System.in);
        System.out.println("请输入用户名");
        username = scnner.nextLine();
        System.out.println("请输入密码");
        psw = scnner.nextLine();
        w = UserDoa.UserRegisrer(username, psw);
        return w;
    }
    //注销
    public static   boolean withdraw()
    {        UserDoa userDoa = new UserDoa();
        boolean f=false;
        System.out.println("true 或者false");
        Scanner input = new Scanner(System.in);//用于接收各种数据类型,需要导入.util包。
       boolean j = input.nextBoolean();//接收不同类型的数据
        if(j)
        {
            System.out.println("开始注销");
           f= userDoa.withdraws();

        }
        return  true;

    }
}




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video