scala 写文件功能：

scala> import java.io.PrintWriter
import java.io.PrintWriter

scala> val outputFile = new PrintWriter("text.txt")
outputFile: java.io.PrintWriter = java.io.PrintWriter@213c812a

scala> outputFile.println("hello panzidong")

scala> outputFile.print("spark is good")

scala> outputFile.close()

scala>

result: