用IO流写个用户名和密码存储的小项目

最新推荐文章于 2022-08-18 13:49:36 发布

原创最新推荐文章于 2022-08-18 13:49:36 发布 · 398 阅读

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该博客展示了如何在Java中实现用户注册功能，包括输入用户名和密码，然后将用户信息保存到文本文件中。程序使用Scanner获取用户输入，创建User对象，并通过PrintWriter将用户信息追加到指定路径的文件中。

1、Constant.java

确定文件存储的位置及文件名

public class Constant {
    public static final String BASA_PATH = "D://";
    public static final String USER_FILE_NAME = "user.txt";
}

2、User.java

初始化用户名和密码

public class User {

    private String username;
    private String password;

    public User(String username, String password) {
        this.username = username;
        this.password = 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;
    }
}

3、Register.java

public class Register {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入用户名：");
        String username = scanner.next();
        System.out.println("请输入密码：");
        String password = scanner.next();

        Register registe = new Register();
        registe.register(username,password);
    }

    public void register(String username,String password){
        User user = new User(username,password);
        saveUser(user);
    }

    private void saveUser(User user) {
        Writer writer = null;
        PrintWriter pw = null;
        try {
            File userfile = new File(Constant.BASA_PATH + Constant.USER_FILE_NAME);
            if (!userfile.exists()) {
                userfile.createNewFile();
            }
            writer = new FileWriter(userfile,true);
            pw = new PrintWriter(writer);
            pw.print(user.getUsername() + "-" + user.getPassword()+ "\n");

        }catch (FileNotFoundException e){
            e.printStackTrace();
        }catch (IOException f){
            f.printStackTrace();
        }finally {
            if (writer != null){
                try {
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (pw != null){
                pw.close();
            }
        }
    }


}