本文实例为大家分享了Java使用IO模拟注册登录的具体代码，供大家参考，具体内容如下
user的pojo类
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package cn.lg.pojo;public class User { private String username; private String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public User(String username, String password) { super(); this.username = username; this.password = password; }} |
Dao层接口
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package cn.lg.dao;import cn.lg.pojo.User;public interface UserDao { /** * 注册 * @param uesr * @return */ boolean register(User user); /** * 登录 * @param user * @return */ boolean login(User user);} |
Dao实现
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package cn.lg.daoImpl;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import cn.lg.dao.UserDao;import cn.lg.pojo.User;public class UserDaomImpl implements UserDao { // 使用静态变量和静态代码块,为了保证文件一加载就创建 private static File file = new File("user.txt"); static { try { file.createNewFile(); } catch (IOException e) { System.out.println("创建文件失败"); // e.printStackTrace(); } } @Override public boolean register(User user) { boolean flag = false; BufferedWriter bw = null; try { bw = new BufferedWriter(new FileWriter(file, true));// 追加 bw.write(user.getUsername() + "=" + user.getPassword()); bw.newLine(); bw.flush(); flag = true; } catch (IOException e) { // e.printStackTrace(); System.out.println("注册失败"); } finally { if (bw != null) { try { bw.close(); } catch (IOException e) { // e.printStackTrace(); System.out.println("用户注册释放资源失败"); } } } return false; } @Override public boolean login(User user) { boolean flag = false; BufferedReader br = null; try { br = new BufferedReader(new FileReader(file)); String line = null; while ((line = br.readLine()) != null) { String[] datas = line.split("="); if (datas[0].equals(user.getUsername()) && datas[1].equals(user.getUsername())) { flag = true; break; } } } catch (FileNotFoundException e) { System.out.println("用户登录找不到信息所在的文件"); //e.printStackTrace(); } catch (IOException e) { System.out.println("用户登录失败"); //e.printStackTrace(); }finally { if(br!=null){ try { br.close(); } catch (IOException e) { System.out.println("用户登录释放资源失败"); //e.printStackTrace(); } } } return flag; }} |
控制台模拟注册登录
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package cn.lg.main;import java.util.Scanner;import cn.lg.dao.UserDao;import cn.lg.daoImpl.UserDaomImpl;import cn.lg.pojo.User;/** * @author L * @date 2017年3月25日 上午11:36:31 * */public class Main { public static void main(String[] args) { while (true) { System.out.println("-----------welcome-----------"); System.out.println("1 登录"); System.out.println("2 注册"); System.out.println("3 退出"); Scanner in = new Scanner(System.in); String choice = in.nextLine(); // 调用Dao层 UserDao userDao = new UserDaomImpl(); switch (choice) { case "1":// 登录 System.out.println("------------登录界面-----------"); System.out.println("请输入账户:"); String username = in.nextLine(); System.out.println("请输入密码:"); String password = in.nextLine(); boolean flag = userDao.login(new User(username, password)); if (flag) { System.out.println("登录成功"); } else { System.out.println("登录失败"); } break; case "2": System.out.println("------------注册界面-----------"); System.out.println("请输入账户:"); String newUsername = in.nextLine(); System.out.println("请输入密码:"); String newPassword = in.nextLine(); userDao.register(new User(newUsername, newPassword)); System.out.println("注册成功"); break; case "3": break; default: System.out.println("谢谢使用，欢迎下次再来"); System.exit(0); 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服务器之家。
原文链接：https://blog.csdn.net/lg346426260/article/details/65935968
