项目名称 ：用户管理系统

Neusoft entity

package com.neusoft.entity;

public class Neusoft {
		private Integer id;
		private String name;
		private String password;
		private String email;
		private String qx;
		public Integer getId() {
			return id;
		}
		public void setId(Integer id) {
			this.id = id;
		}
		public String getName() {
			return name;
		}
		public void setName(String name) {
			this.name = name;
		}
		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 getQx() {
			return qx;
		}
		public void setQx(String qx) {
			this.qx = qx;
		}
		@Override
		public String toString() {
			return "id为" + id + ", 账号为" + name + ",密码为" + password + ", 邮箱为" + email + ", 权限为" + qx;
		}
		public Neusoft(Integer id, String name, String password, String email, String qx) {
			super();
			this.id = id;
			this.name = name;
			this.password = password;
			this.email = email;
			this.qx = qx;
		}
		public Neusoft() {
			super();
		}
		
}

dao

NeusoftDaoimpi

package com.neusoft.dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.neusoft.entity.Neusoft;


public class NeusoftDaoImpi {
		public List getAll() throws SQLException{
			String sql="select * from Neusoft order by id";
			Connection cn = jdbcConnection.getconnection();
			ResultSet rs = jdbcConnection.executeQuery(cn, sql, null);
			List list=new ArrayList<>();
			Neusoft neu=null;
			while(rs.next()) {
				int id=rs.getInt("id");
				String name =rs.getString("name");
				String password=rs.getString("password");
				String email=rs.getString("email");
				String qx =rs.getString("qx");
				neu= new Neusoft(id, name, password, email, qx);
				list.add(neu);
			}
			rs.close();
			jdbcConnection.closeConnection(cn);
			return list;
		}
		public Neusoft getbyid(int id) throws SQLException {
		String sql="select * from neusoft where id=?";
		Connection cn = jdbcConnection.getconnection();
		ResultSet rs = jdbcConnection.executeQuery(cn, sql,new Object[]{id});
		Neusoft neu=null;
		while(rs.next()) {
			int sid=rs.getInt("id");
			String name =rs.getString("name");
			String password=rs.getString("password");
			String email=rs.getString("email");
			String qx =rs.getString("qx");
			neu= new Neusoft(sid, name, password, email, qx);
			
		}
		rs.close();
		jdbcConnection.closeConnection(cn);
		return neu;
			
		}
		public int inserti(Neusoft neu) throws SQLException {
			String sql="insert into neusoft values(null,?,?,?,default)";
			int n = jdbcConnection.executeUpdate(sql, new Object[]{neu.getName(),neu.getPassword(),neu.getEmail()});
			return n;
			
		}
		public int del(int id) throws SQLException {
			String sql="DELETE FROM neusoft WHERE id=?;";
			int n = jdbcConnection.executeUpdate(sql, new Object[]{id});
			return n;
			
		}
		public int up(Neusoft neu) throws SQLException {
			String sql="UPDATE neusoft SET NAME=?,password=?,email=?,qx=? WHERE id=? ";
			int n = jdbcConnection.executeUpdate(sql, new Object[]{neu.getName(),neu.getPassword(),neu.getEmail(),neu.getQx(),neu.getId(),});
			return n;
			
		}
		public boolean  login(String name,String password) throws SQLException {
			String sql="select * from neusoft where name=? and password = ?";
			Connection cn = jdbcConnection.getconnection();
		System.out.println("xxx");
			ResultSet rs = jdbcConnection.executeQuery(cn, sql,new Object[]{name,password});
			Neusoft neu=null;
			boolean x=false;
			while(rs.next()) {
				int sid=rs.getInt("id");
				String name1 =rs.getString("name");
				String password1=rs.getString("password");
				if(name1!=("")|password1!=("")){
					System.out.println(name1+password);
					x=true;
					}else{
						x=false;
					}
				}
				//neu= new Neusoft(sid, name, password, email, qx);
			
				return x;
			}
		
		public Neusoft loginy(String name,String password) throws SQLException {
			String sql="select * from neusoft where name=? and password = ?";
			Connection cn = jdbcConnection.getconnection();
			ResultSet rs = jdbcConnection.executeQuery(cn, sql,new Object[]{name,password});
			Neusoft neu=null;
			while(rs.next()) {
				int sid=rs.getInt("id");
				String name1 =rs.getString("name");
				String password1=rs.getString("password");
				String email=rs.getString("email");
				String qx =rs.getString("qx");
				neu= new Neusoft(sid, name1, password1, email, qx);
				
			}
			rs.close();
			jdbcConnection.closeConnection(cn);
			return neu;
				
			}
		public Neusoft getbyusername(String na) throws SQLException {
			String sql="select * from neusoft where name like ?";
			Connection cn = jdbcConnection.getconnection();
			ResultSet rs = jdbcConnection.executeQuery(cn, sql,new Object[]{na});
			Neusoft neu=null;
			while(rs.next()) {
				int sid=rs.getInt("id");
				String name =rs.getString("name");
				String password=rs.getString("password");
				String email=rs.getString("email");
				String qx =rs.getString("qx");
				neu= new Neusoft(sid, name, password, email, qx);
				
			}
			rs.close();
			jdbcConnection.closeConnection(cn);
			return neu;
		}
		public Neusoft getqx(int id) throws SQLException {
			String sql="select *  from neusoft where id=?";
			Connection cn = jdbcConnection.getconnection();
			ResultSet rs = jdbcConnection.executeQuery(cn, sql,new Object[]{id});
			Neusoft neu=null;
			while(rs.next()) {
				int sid=rs.getInt("id");
				String name =rs.getString("name");
				String password=rs.getString("password");
				String email=rs.getString("email");
				String qx =rs.getString("qx");
				neu= new Neusoft(sid, name, password, email, qx);
				
			}
			rs.close();
			jdbcConnection.closeConnection(cn);
			return neu;
				
			}
}

jdbc连接

package com.neusoft.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class jdbcConnection {
	private static String driverClassName = "com.mysql.jdbc.Driver";
	private static String url = "jdbc:mysql://localhost:3306/test2";
	private static String username = "root";
	private static String password = "root";
	static {
		try {
			Class.forName(driverClassName);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}// 获得链接

	public static Connection getconnection() throws SQLException {
		Connection connection = DriverManager.getConnection(url, username, password);
		//System.out.println("连接成功");
		return connection;

	}

	// 改链接
	public static void closeConnection(Connection connection) throws SQLException {
		connection.close();

	}

	// 增删改 条件 sql语句 以及问号个数
	public static int executeUpdate(String sql, Object[] params) throws SQLException {
		Connection connection = getconnection();
		PreparedStatement st = connection.prepareStatement(sql);
		if (params != null) {
			for (int i = 0; i < params.length; i++) {
				st.setObject(i + 1, params[i]);

			}
		}
		int n = st.executeUpdate();
		st.close();
		connection.close();
		return n;
	}
	public static ResultSet executeQuery(Connection connection,String sql, Object[] params) throws SQLException {
		
		PreparedStatement st = connection.prepareStatement(sql);
		if (params != null) {
			for (int i = 0; i < params.length; i++) {
				st.setObject(i + 1, params[i]);

			}
		}
		ResultSet rs=st.executeQuery();
		
		return rs;
	}
}

主界面

package com.neuspft.ui;

import java.sql.SQLException;
import java.util.List;
import java.util.Scanner;

import com.neusoft.dao.NeusoftDaoImpi;
import com.neusoft.entity.Neusoft;

public class jz {
	public static void main(String[] args) throws SQLException {
		String name;
		String password;
		String email;
		Neusoft dly=null;
		NeusoftDaoImpi  neus=new NeusoftDaoImpi();
		boolean b = true;
		while(b){
		System.out.println("欢迎使用neusoft系统");
		System.out.println("================");
		System.out.println("登陆系统=========1");
		System.out.println("注册系统=========2");
		System.out.println("退出系统=========3");
		Scanner s=null;
		int x=0;
		try {
			s = new Scanner(System.in);
			x = s.nextInt();
		} catch (Exception e) {
			System.out.println("输入的值不是数字");
		}
		switch(x){
		case 1:
			System.out.print("请输入账号");
			name=s.next();
			System.out.print("请输入密码");
			password=s.next();
			boolean p=neus.login(name, password);
			if(p==true){
				System.out.println("登陆成功");
				dly=neus.loginy(name,password);
				System.out.println("欢迎登陆主窗体");
				System.out.println("尊敬的"+dly.getName()+"你好\t\t您的权限为"+dly.getQx());
				if(dly.getQx().equals("管理员")){
					System.out.println("管理员");
					boolean gl=true;
					while(gl){
						System.out.println("=============");
						System.out.println("添加用户======1");
						System.out.println("删除用户======2");
						System.out.println("修改用户======3");
						System.out.println("查询用户======4");
						System.out.println("退出程序======5");
						int g=s.nextInt();
						switch(g){
						case 1:
							System.out.print("请输入账号");
							name=s.next();
							System.out.print("请输入密码");
							password=s.next();
							System.out.println("请输入邮箱");
							email=s.next();
							Neusoft neu= new Neusoft(null, name, password, email, null);
							int z=neus.inserti(neu);
							if(z==1){
								System.out.println("添加用户成功，请牢记相关信息");
								
							}else{
								System.out.println("发生未知错误，注册失败");
							}
							continue;
						case 2:
							System.out.println("输入需要删除的id");
							int sc=s.nextInt();
							int c=neus.del(sc);
							if(c==1){
								System.out.println("删除成功");
							}else{
								System.out.println("删除失败");
							}
							break;
						case 3:
							
							
							System.out.println("请输入要修改id");
							int  u=s.nextInt();
							Neusoft nue2=neus.getqx(u);
							if(nue2.getQx().equals("管理员")){
								System.out.println("若想修改管理员的权限请联系数据库管理员");
								break;
							}
							System.out.println("请输入要修改账户");
							String  u1=s.next();
							System.out.println("请输入要修改密码");
							String  u2=s.next();
							System.out.println("请输入要修改邮箱");
							String  u3=s.next();
							System.out.println("请输入要修改权限");
							String  u4=s.next();
						if(u4.equals("管理员")){
								System.out.println("管理员具有修改用户信息的权限确定保存修改？");
								System.out.println("是======1");
								System.out.println("否======2");
								int pd=s.nextInt();
							switch(pd){
							case 1:
								System.out.println("正在保存修改");
								Neusoft neu1 = new Neusoft(u, u1, u2, u3, u4);
										int up=neus.up(neu1);
										if(up==1){
											System.out.println("更改已被保存");
											}
										else{
											System.out.println("发生未知错误请联系管理员");
										}
									break;	
							case 2:
							System.out.println("已舍弃该修改");
							break;
							}
							
							}
							break;
						case 4:
							System.out.println("请输入查询的方式");
							System.out.println("查询所有用户==1");
							System.out.println("根据id查询==2");
							System.out.println("根据姓名查询==3");
							int cx=s.nextInt();
							switch(cx){
							case 1:
								List li=neus.getAll();
								for(Neusoft N:li){
								System.out.println(N);
								}
								break;
							case 2:
								System.out.println("请输入需要查询的id");
								int x1=s.nextInt();
							Neusoft n=neus.getbyid(x1);
							System.out.println("id为"+n.getId()+"账号为"+n.getName()+"密码为"+n.getPassword()+"邮箱为"+n.getEmail()+"权限为"+n.getQx());
							break;
							case 3:
								System.out.println("请输入要查询的账户(支持模糊查询)");
								String na=s.next();
								Neusoft n1=neus.getbyusername("%"+na+"%");
								System.out.println("id为"+n1.getId()+"账号为"+n1.getName()+"密码为"+n1.getPassword()+"邮箱为"+n1.getEmail()+"权限为"+n1.getQx());
								break;
							}
						case 5:
						gl=false;
						
						}
					}
				}else{
					Neusoft neu3= neus.getbyusername(name);
					System.out.println("普通用户");
					System.out.println("=============");
					System.out.println("修改个人信息======1");
					System.out.println("查询个人信息======2");
					System.out.println("退出程序======3");
					int g=s.nextInt();
					switch(g){
					case 1:
						System.out.println("请输入修改后的账户名");
						String  u1=s.next();
						System.out.println("请输入要修改密码");
						String  u2=s.next();
						System.out.println("请输入要修改邮箱");
						String  u3=s.next();
						Neusoft neu4 = new Neusoft(null, u1, u2, u3, null);
					int jg=neus.up(neu4);
					if(jg==1){
					System.out.println("修改个人信息成功");
					}//else{
						//System.out.println("发生未知错误请联系管理员");
				//	}
					break;
					case 2:
					Neusoft n2=neus.getbyid(neu3.getId());
					System.out.println("id为"+n2.getId()+"账号为"+n2.getName()+"密码为"+n2.getPassword()+"邮箱为"+n2.getEmail()+"权限为"+n2.getQx());
					break;
					case 3:
						break;
					}
				}
				break;
			}else{
				System.out.println("未搜索到相关信息，请注册后尝试");
				continue;
			}
			
		case 2:
			System.out.print("请输入账号");
			name=s.next();
			System.out.print("请输入密码");
			password=s.next();
			System.out.println("请输入邮箱");
			email=s.next();
			Neusoft neu= new Neusoft(null, name, password, email, null);
			int z=neus.inserti(neu);
			if(z==1){
				System.out.println("注册成功，请牢记账号密码");
				
			}else{
				System.out.println("发生未知错误，注册失败");
			}
			continue;
		case 3:
			System.out.println("正在退出系统");
			break;
		default:
			System.out.println("输入有误");
			break;
		}
		
		b=false;
		
	}
	
}
}