Spark 2.0.0使用变量模式读取json数据

import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.types.{StructType, StructField, StringType, IntegerType}

val spark = SparkSession.builder()
  .appName("Reading JSON Data")
  .master("local")
  .getOrCreate()

val jsonSchema = StructType(Seq(
  StructField("name", StringType, nullable = true),
  StructField("age", IntegerType, nullable = true),
  StructField("city", StringType, nullable = true)
))

val jsonData = spark.read.schema(jsonSchema).json("path/to/json/file.json")

jsonData.show()  // 显示数据的内容
jsonData.printSchema()  // 打印数据的结构