mysql数据库连接异常问题

java.lang.ClassNotFoundException: org.g.Driver
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:260)
at runDemo.DataBase.main(DataBase.java:22)

Jar包没有引入吧？所以报类没有找到的异常。这有一个Java连MySQL的示例。http://blog.csdn.net/chinacsharper/article/details/39777643

这是代码
public class DataBase {
protected static String dbClassName = "org.mysql.jdbc.Driver";
protected static String dbUrl = "jdbc:mysql://localhost:3306/bookmanager?user=root&password=DMM456123";
protected static String dbUser = "root";
protected static String dbPwd = "DMM456123";

public static Connection conn = null;

public static void main(String[] args) {


        try {
            if (conn == null) {
                Class.forName(dbClassName);
                conn = DriverManager.getConnection(dbUrl, dbUser, dbPwd);
                System.out.println("Success");
                //stmt = conn.createStatement(); // 创建Statement对象

            }
        } catch (Exception ee) {
            ee.printStackTrace();
        }

}

加入 mysql 驱动