显示驱动加载失败，连不上数据库，是哪里出错了吗？
package 学生信息管理系统;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import javax.swing.JOptionPane;
class DatebaseConnection {
//数据库连接成功
public final String DBDRIVER="net.sourceforge.jtds.jdbc.Driver";
//数据库连接的URL
public final String DBURL="jdbc:jtds:sqlserver://127.0.0.1:1433/Competition";
//数据库登录名
public final String DBUSER="sa";
//数据库登录密码
public final String DBPASS="123";
private Connection conn=null;
public DatebaseConnection(){
try{
//加载数据库驱动
Class.forName(DBDRIVER);
//获取数据库连接
conn=DriverManager.getConnection(DBURL,DBUSER,DBPASS);
}catch(SQLException e){
JOptionPane.showMessageDialog(null,"数据库连接失败","异常",JOptionPane.ERROR_MESSAGE );
System.exit(0);
}catch(ClassNotFoundException e){
JOptionPane.showMessageDialog(null, "驱动加载失败","异常",JOptionPane.ERROR_MESSAGE );
System.exit(0);
}
}
public Connection getConnection(){
return this.conn;
}
public void close(){
//关闭数据库连接
if(this.conn!=null){
try{
this.conn.close();
}catch(SQLException e){}
}
}
}
public class ConnectSQLServer{
public static void main(String[] args) {
try{
Connection con=new DatebaseConnection().getConnection();
if(con!=null){
JOptionPane.showMessageDialog(null,"数据库连接成功","祝贺",JOptionPane.INFORMATION_MESSAGE );
System.exit(0);
}else{
JOptionPane.showMessageDialog(null, "数据库连接失败","错误",JOptionPane.ERROR_MESSAGE );
System.exit(0);
}
con.close();
}catch(SQLException e){
e.printStackTrace();
}
}
}
