java.sql.SQLException: [Microsoft][ODBC 驱动程序管理器] 未发现数据源名称并且未指定默认驱动程序

Statement stat;
ResultSet result;
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    String   url   =   "jdbc:odbc:Driver   =   {Microsoft   Access   Driver   (*.mdb)};   DBQ=D:/db1.mdb";
         Connection con=DriverManager.getConnection(url,   "",   "");
         stat=con.createStatement();
         result=stat.executeQuery("Select * from y1");