java 应用程序登录功能的实现

package s;
import java.sql.*;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
public class test01 {
    public static void main(String[] args) {
    /*初始化界面*/
    Map<String,String>userinfo=initUI();
    /*验证登陆密码账户*/
    boolean i=login(userinfo);
    System.out.println(i? "登陆成功":"登陆失败");
}

    private static boolean login(Map<String, String> userinfo) {
        Connection conn=null;
        Statement stmt=null;
        ResultSet rs=null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/JDBCtest03","root","zber1574");
            stmt=conn.createStatement();
            String sql="select * from test where user='"+userinfo.get("user")+"'and password='"+userinfo.get("password")+"'";
            rs=stmt.executeQuery(sql);
            if(rs.next()) {
                return true;
            }
            
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }finally {
            if(rs!=null) {
                try {
                    rs.close();
                } catch (SQLException e) {
                    // TODO 自动生成的 catch 块
                    e.printStackTrace();
                }
            }
            if(stmt!=null) {
                try {
                    stmt.close();
                } catch (SQLException e) {
                    // TODO 自动生成的 catch 块
                    e.printStackTrace();
                }
            }
            if(conn!=null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    // TODO 自动生成的 catch 块
                    e.printStackTrace();
                }
            }
        }
        
        return false;
    }

    private static Map<String, String> initUI() {
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入账户:");
        String user=sc.next();
        System.out.println("请输入密码:");
        String password=sc.next();
        Map<String,String>userlogin=new HashMap<>();
        userlogin.put("user", user);
        userlogin.put("password", password);
        return userlogin;
    }
    }

用Map类创建账号与密码，连接数据库判断输入的密码是否正确，若正确输出登陆成功。