【案例5-3】 模拟用户注册
【案例介绍】
1.任务描述
互联网为我们提供了巨大的便利，如微信带给我们的视频、淘宝带给我们便利的购物等，但这些APP都需要有一个账户才可以登录，而账户需要注册可以获取。
本例要求编写一个程序，模拟用户注册。用户输入用户名、密码、确认密码、生日（格式为yyyy–mm—dd为正确）、手机号（手机号长度为11位，并且以13、15、17、18为开头的手机号为正确）、邮箱（包含符号“@”为正确）信息之后，判断信息正确后，验证用户是否重复，重复则给出相应提示，如果不重复则注册成功。案例要求使用HashSet集合实现。

package com.j2se.myInstances.example6_3;

import java.util.Date;
import java.util.HashSet;
import java.util.Scanner;

public class UserRegister {

    private static HashSet<User> USER_DATA = new HashSet<User>();

    public static void main(String[] a) {

        initData();

        Scanner sc = new Scanner(System.in);
        System.out.println("用户名：");
        String uname = sc.next();
        System.out.println("密码：");
        String upass = sc.next();
        System.out.println("重复密码：");
        String repass = sc.next();
        System.out.println("邮箱：");
        String email = sc.next();
        System.out.println("生日：");
        String birthdate = sc.next();
        System.out.println("手机号：");
        String pnumber = sc.next();


        // 校验用户信息,返回登录状态信息
        CheckInfo checkInfo = new CheckInfo(USER_DATA);
        String str = checkInfo.checkAction(uname, upass, repass, email, pnumber, birthdate);
        System.out.println("注册结果：" + str);
    }

    // 初始化数据，创建两个已存在的用户信息
    private static void initData() {
        User user = new User("James", "js123", "js@lake.cn",
                "18897779984", new Date().toString());
        User user2 = new User("Harden", "hd123", "hd@hou.cn",
                "13454647878", new Date().toString());
        USER_DATA.add(user);
        USER_DATA.add(user2);
    }

}

package com.j2se.myInstances.example6_3;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashSet;

public class CheckInfo {
    public static HashSet<User> USER_DATA = new HashSet<>();

    public CheckInfo(HashSet<User> USER_DATA) {
        this.USER_DATA = USER_DATA;
    }

    // 校验用户信息,返回登录状态信息
    public String checkAction(String uname, String upass, String repass, String email,
                              String uphone, String birthdate) {
        StringBuilder result = new StringBuilder();

        int state = 1; // 1: 成功，2：失败
        // 密码判断
        if (!upass.equals(repass)) {
            result.append("两次输入密码不一致\n");
            state = 2;
        }
        // 生日判断
        if (birthdate.length() != 10) {
            result.append("生日格式错误！\n");
            state = 2;
        } else {
            for (int i = 0; i < birthdate.length(); i++) {
                Character c = birthdate.charAt(i);
                if (i == 4 || i == 7) {
                    if (c != '-') {
                        result.append("生日格式错误！\n");
                        state = 2;
                    }
                }
            }
        }
        // 手机号判断
        if (uphone.length() != 11) {
            result.append("手机号码无效！, 必须是11位\n");
            state = 2;
        } else if (!uphone.startsWith("13") || !uphone.startsWith("15") || !uphone.startsWith("17") || !uphone.startsWith("18")) {
            result.append("手机号码不正确！\n");
            state = 2;
        }

        // 邮箱判断
        // 判断邮箱地址，默认不带@符号的邮箱为无效邮箱
        if (!email.contains("@")) {
            result.append("邮箱格式不正确！\n");
            state = 2;
        }

        // 如果以上信息校验无误，则将新用户加入到集合
        if (state == 1) {
//            格式化日期返回Date对象
//             定义日期格式
            DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
            Date dateBirthday = null;
            try {
                dateBirthday = format.parse(birthdate);
            } catch (ParseException e) {
                e.printStackTrace();
            }

            User user = new User(uname, repass, email, uphone, birthdate);
            if (!USER_DATA.add(user)) {
                result.append("用户已存在！\n");
                state = 2;
            }
            if (state == 1) result.append("用户已存在！\n");

        }
        return result.toString();

    }

}

package com.j2se.myInstances.example6_3;


public class User {
    private String username;
    private String password;
    private String email;
    private String phoneNumber;
    private String birthdate;

    public User() {
    }

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

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        User user = (User) o;

        if (username != null ? !username.equals(user.username) : user.username != null) return false;
        if (password != null ? !password.equals(user.password) : user.password != null) return false;
        if (email != null ? !email.equals(user.email) : user.email != null) return false;
        if (phoneNumber != null ? !phoneNumber.equals(user.phoneNumber) : user.phoneNumber != null) return false;
        return birthdate != null ? birthdate.equals(user.birthdate) : user.birthdate == null;
    }

    @Override
    public int hashCode() {
        return username.hashCode();  //  以用户名作为是否重复的依据
    }

    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 String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }

    public String getBirthdate() {
        return birthdate;
    }

    public void setBirthdate(String birthdate) {
        this.birthdate = birthdate;
    }
}