def main(args: Array[String]): Unit = {
  //spark SparkSession对象 操作sql语句
    val spark = SparkSession.builder().config(conf).getOrCreate()
     val sc = spark.sparkContext
    import spark.implicits._
     //jdbc
    val prop = new Properties()
    prop.put("user","root")
     prop.put("password","root")
    //创建链接读取
    val df = spark.read.jdbc("jdbc:mysql://localhost:3306/数据库","user",prop)
    df.show()