输入账号和密码，验证是否正确

CREATE TABLE USER
(      NAME VARCHAR(20),
       PASSWORD VARCHAR(20),
       real_name VARCHAR(20)
);

package HomeWork;

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

import org