用Java链接SQL Server

public class ConData{
    private String driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver";
    private String dbURL="jdbc:sqlserver://localhost:1433;DatabaseName=testData";
    private String userName;//="sa"
    private String userPwd;//="199369265"
    private Vector<Point> data=new Vector<Point>();
    private Connection dbConn;

    public ConData(String username,String password){
        userName=username;
        userPwd=password;
    }
    public void Treat() throws IOException
    {
        try{
            Class.forName(driverName);
            dbConn=DriverManager.getConnection(dbURL,userName,userPwd);
            JOptionPane.showMessageDialog(null, "连接数据库成功");        

            Statement state=dbConn.createStatement();
            ResultSet rs=state.executeQuery("select * from houst_data");
            int R=6370856;
            int cnt=0;
            while(rs.next()){
                String name=rs.getString(1);
                double x=rs.getDouble(3);//可以采用列号，也可以采用列名，如"X"
                double y=rs.getDouble(4);
                int price=rs.getInt(5);
                data.addElement(new Point(name,x,y,price,cnt));
                cnt++;
            }
        }
        catch(Exception e){
            e.printStackTrace();
            System.out.print("连接失败!");
        }
    }
}