一、系统介绍

该系统实现了管理员系统登陆、用户信息查询、用户信息添加、用户信息修改、用户信息删除。

二、功能展示

1.管理员登陆

2.用户信息查询

3.用户信息添加

4.用户信息修改

5.用户信息删除

三、系统实现

1.UserDao .java

package dao;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import entity.User;
import util.DbUtils;



public class UserDao {
    private Connection conn=null;
    private PreparedStatement ps=null;
    private ResultSet rs=null;
    
    //登陆
    public boolean login(String username,String password){
        String sql="select * from t_user where username='"+ username +"' and password='"+password+"'";
        List<User> list=new ArrayList<User>();
        boolean istrue = false;
        try {
             conn=DbUtils.getConnection();
             ps=conn.prepareStatement(sql);
             rs=ps.executeQuery();
             System.out.println(ps.toString());
             while(rs.next()){
            	 istrue=true;
             }
             DbUtils.close(rs, ps, conn);          
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return istrue;
    }
   //查询用户信息
	public ArrayList<User> selectUser(String username) {
		ArrayList<User> tag_Array = new ArrayList<User>();
		Connection conn = null;
		try {
			conn = DbUtils.getConnection();
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		};
		String sql = "select * from t_user where username like '%"+ username +"%'";
		PreparedStatement stm = null;
		ResultSet rs = null;
		try {
			stm = conn.prepareStatement(sql);
			rs = stm.executeQuery();
			while(rs.next()){
				User user = new User();
				user.setUuid(rs.getString("uuid"));
				user.setUsername(rs.getString("username"));
				user.setPassword(rs.getString("password"));
				tag_Array.add(user);
			}			
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			try {
				DbUtils.close(rs, stm, conn);
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return tag_Array;
	}
	//添加用户信息
    public int addUser(String uuid,String username,String password){
    	int result=0;
        String sql="insert into t_user(uuid,username,password) values(?,?,?)";
        try {
        	conn=DbUtils.getConnection();
            ps = conn.prepareStatement(sql);
            ps.setString(1, uuid);
            ps.setString(2, username);
            ps.setString(3, password);
            result =ps.executeUpdate();// 返回值代表收到影响的行数
             DbUtils.close(rs, ps, conn);          
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return result;
    }
    
    //修改用户信息
    public int updateUser(String uuid,String username,String password){
    	int result=0;
        String sql="update t_user set username=?,password=? where uuid =?";
        try {
        	conn=DbUtils.getConnection();
            ps = conn.prepareStatement(sql);          
            ps.setString(1, username);
            ps.setString(2, password);
            ps.setString(3, uuid);
            result =ps.executeUpdate();// 返回值代表收到影响的行数
             DbUtils.close(rs, ps, conn);          
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return result;
    }
    
    //删除
    public int DelUser(String uuid){
    	int result=0;
        String sql="DELETE from t_user where uuid = '" + uuid + "'";
        try {
        	conn=DbUtils.getConnection();
            ps = conn.prepareStatement(sql);
            result =ps.executeUpdate();// 返回值代表收到影响的行数
             DbUtils.close(rs, ps, conn);          
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return result;
    }
}

四、其它

1.其他系统实现

Java+Swing实现学生选课管理系统
Java+Swing图书管理系统