java问题请高手解决

import java.sql.*;
import com.microsoft.jdbc.sqlserver.SQLServerDriver;
public class zhu {
public static void main(String args[])throws Exception{
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
Connection con=DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;databasename=Student","sa","sa");
Statement st=con.createStatement();
ResultSet rs=st.executeQuery("select * from student");
while(rs.next()){
System.out.println(rs.getInt(1));
System.out.println(rs.getString(2));
}
}
}

出现异常
Exception in thread "main" java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Error establishing socket.
at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.base.BaseExce

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