解决Tomcatt下连接数据库的classNoFount问题

import java.sql.*;

public class SQLtest {
    // JDBC 驱动名及数据库 URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost:3306/mydatabase?useUnicode=true&" +
            "characterEncoding=utf-8&useSSL=true&serverTimezone=GMT%2B8";

    // 数据库的用户名与密码，需要根据自己的设置
    static final String USER = "root";
    static final String PASS = "123456";

    public boolean mySql(String sname, String spassword) {
//    public static void main(String[] args) {
//        String sname = "user1";
//        String spassword="123456";
        Boolean success = false;
        Connection conn = null;
        Statement stmt = null;
        try {
            // 注册 JDBC 驱动
            Class.forName(JDBC_DRIVER);

            // 打开链接
            System.out.println("连接数据库...");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);

            // 执行查询
            System.out.println(" 实例化Statement对象...");
            stmt = conn.createStatement();
            String sql;
            sql = "SELECT name,password FROM table_name ";
            ResultSet rs = stmt.executeQuery(sql);

            // 展开结果集数据库
            while (rs.next()) {
                // 通过字段检索
                String name = rs.getString("name");
                String password = rs.getString("password");

//                // 输出数据
//                System.out.println("用户名: " + name);
//                System.out.println("密码: " + password);
                if (name.equals(sname) && password.equals(spassword)) {
                    success = true;
                }
            }
            // 完成后关闭
            rs.close();
            stmt.close();
            conn.close();

        } catch (SQLException se) {
            // 处理 JDBC 错误
            se.printStackTrace();
        } catch (Exception e) {
            // 处理 Class.forName 错误
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (stmt != null) stmt.close();
            } catch (SQLException se2) {
            }// 什么都不做
            try {
                if (conn != null) conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            }
        }
        System.out.println("Goodbye!");
        System.out.println(success);
        return success;

    }
}