java 连接 oracle 数据库

 try{

   String url = "jdbc:oracle:thin:@127.0.0.1:1521:orc";

   String user = "test";

   String password = "test";

   Connection conn = null;

   Statement stat = null;

   ResultSet rs = null;

   Class.forName("oracle.jdbc.driver.OracleDriver").newInstence();

   conn = DriverManager.getConnection(url,user,password);

   stat = conn.createStatement();

   String sql = "";

   rs = stat.executeQuery(sql);

}catch(Exception e){

  e.printStackTrace();

}finally{

   rs.close();

   stat.close();

   conn.close();

}