java加载sqlserver驱动失败

java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at pDatabase.test1.main(test1.java:12)


package pDatabase;
import java.sql.*；
public class test1 {

    public static void main(String[] args) {
         Statement sm=null;
         Connection ct=null;
        try{
            Class.forName
            ("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
            ct=DriverManager.getConnection("jdbc:odbc:sqldb","sa","130124");
            sm=ct.createStatement();
                
            int i=sm.executeUpdate("insert into dept values ('50','sec','newyork')");
            if (i==1){
                System.out.println("success");
            }
            
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            try {
                if (sm!=null){
                    sm.close();
                }
                if(ct!=null){
                    ct.close();
                }
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

这是什么原因？

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驱动包没有加载进来

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java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver

jar包没找到