找不到com.mysql.jdbc.Driver

我用mysql创建了个student表，然后mysql服务也启动了
   用myeclipse加载驱动是说找不到,问下原因，代码下面:

package hcl;
import java.sql.*;
public class test {
public static void main(String[] args) {
        try{
            Class.forName("com.mysql.jdbc.Driver");        //加载驱动
            Connection con=DriverManager.getConnection("jdbc:mysql://localhos:3306/student", "root", "root");
                                                        //说明数据库URL,链接数据库
            Statement stm=con.createStatement();
            String str="select * from student;";        //构造SQL语句
            stm.executeUpdate(str);
            ResultSet rs=stm.executeQuery(str);
            while(rs.next()){                            //执行结果
                System.out.print(rs.getInt(1)+" ");                
                System.out.print(rs.getString(2)+" ");
                System.out.print(rs.getInt(3)+" ");
                System.out.println(rs.getInt(4));                
            }
            stm.close();
            con.close();
            
        }
        catch(Exception e){
                        e.printStackTrace();
                    }
        }
}


      java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
    at (Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at (Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at hcl.test.main(test.java:9)