【Spark征服之路-3.6-Spark-SQL核心编程(五)】UDF:val sparkConf = new SparkConf().setMaster("local[*]").setAppName("SQLDemo") //创建SparkSession对象 val spark :SparkSession = SparkSession.builder().config(sparkConf).getOrCreate() import spark.implicits._ //读取json文件 val df : DataFrame = spark.read.json("S