使用JDBC实现员工系统的注册与登录功能

 package com.hzwn.entity;

    
  
    
 import lombok.Data;
    
  
    
 @Data
    
 public class User {
    
  
    
     private Long id;
    
     private String username;
    
     private String password;
    
     private String nickname;
    
  
    
     public User(){
    
  
    
     }
    
     public User(String username,String password,String nickname){
    
     this.username=username;
    
     this.password = password;
    
     this.nic