public class MysqlConnect {
    //定义MySQL数据库的连接地址
    public static final String DBURL = "jdbc:mysql://ip:port/数据库名?autoReconnect=true&useUnicode=true&characterEncoding=utf8&useSSL=false";

    //MySQL数据库的连接用户名和连接密码
    public static final String DBUSER = "用户";
    public static final String DBPASS = "密码";
    public static final String SQLNAME = "com.mysql.jdbc.Driver";//驱动

    public void mysqlConn(String sql) {
        Connection conn = null;
        int id;
        String name = null;
        String count = null;
        try{
            Class.forName(SQLNAME);
        }catch(ClassNotFoundException e){
            e.printStackTrace();
        }
//         sql = "sql语句";
        try {
            conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
            System.out.println(conn);
            Statement stmt = conn.createStatement();
            ResultSet resultSet = stmt.executeQuery(sql);
            while (resultSet.next()){
                id = resultSet.getInt("id");//通过字段拿值
                name = resultSet.getString("name");//通过字段拿值
                count = resultSet.getString("count(1)");//通过字段拿值
                System.out.println("id: " + id + ", name: " + name + ", count: " + count);
            }
            conn.close();
        } catch (SQLException e1) {
            e1.printStackTrace();
        }
    }
}

maven依赖包：

        <!-- MySql 5.5 Connector -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.25</version>
        </dependency>