JDBC登录案例

package cn.itcast.jdbc;

import cn.itcast.jdbc.util.JDBCUtils;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;

public class JDBCDemo6 {
    public static void main(String[] args) throws SQLException {
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入用户名：");
        String name = sc.nextLine();
        System.out.println("请输入密码：");
        String password=sc.nextLine();
        boolean flag = login(name, password);
        if (flag){
            System.out.println("登录成功");
        }else {
            System.out.println("登录失败");
        }

    }
    //通过键盘录入用户名和密码
    //判断用户名是否登录成功
    public static boolean login(String name,String password) throws SQLException {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        if (name == null || password == null) {
            return false;
        }
        try {
            conn = JDBCUtils.getConnection();
            String sql = "select *from user where name='" + name + "' and password ='" + password + "'";
            stmt = conn.createStatement();
            rs = stmt.executeQuery(sql);
            return rs.next();
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            JDBCUtils.close(rs,stmt,conn);
        }
        return false;
    }
}