Scala程序抛出java.io.FileNotFoundException问题求助

Hey there, let's work through this FileNotFoundException issue together—even though you confirmed the file exists, there are a few common Windows-specific gotchas that might be tripping you up. Here are the fixes to try, in order of likelihood:

1. Fix the Path Separator #

While three forward slashes /// should work in theory, Windows handles file paths more reliably with either:

• Single forward slashes: C:/DataResearch/SparkScala/MN212142_9392.csv
• Double backslashes (since backslashes are escape characters in Scala strings): C:\\DataResearch\\SparkScala\\MN212142_9392.csv

Updating your path to one of these formats is the most common quick fix for Windows path issues in Scala.

2. Run Your IDE with Administrator Permissions #

Folders directly under the C: drive often require elevated permissions to access. If you're running IntelliJ IDEA as a regular user, it might not have permission to read from C:\DataResearch.

Fix: Right-click your IntelliJ shortcut and select Run as administrator, then re-run your code.

3. Verify the File Name Isn't Hiding an Extra Extension #

Windows defaults to hiding file extensions for known types. That means your file might actually be named MN212142_9392.csv.csv (the second .csv is hidden, so you only see the first part in File Explorer).

Fix: Open File Explorer, go to the View tab, and check the File name extensions box. Double-check that your file's full name matches exactly what's in your code.

4. Double-Check for Typos #

It sounds trivial, but even a tiny typo in the folder or file name will trigger this error. Confirm:

• DataResearch and SparkScala are spelled correctly in both your code and the file system
• The filename MN212142_9392.csv matches exactly (Windows is case-insensitive, but aligning case avoids edge cases)

Modified Code Example #

Here's your code updated with a single-forward-slash path (the simplest reliable format for Windows):

import scala.io.Source
case class TempData(day:Int , DayOfYear:Int , month:Int , year:Int , precip:Double , snow:Double , tave:Double, tmax:Double, tmin:Double)
object TempData {
  def main(args:Array[String]) : Unit ={
    val source = Source.fromFile("C:/DataResearch/SparkScala/MN212142_9392.csv")
    val lines = source.getLines().drop(1)
    val data= lines.map{ line =>
      val p = line.split(",")
      TempData(p(0).toInt , p(1).toInt, p(2).toInt, p(4).toInt , p(5).toDouble, p(6).toDouble , p(7).toDouble, p(8).toDouble,p(9).toDouble)
    }.toArray
    source.close()
    data.take(5).foreach(println)
  }
}

Start with the first two fixes—they resolve 90% of these Windows file access issues. If none of these work, we can dig into more edge cases!

内容的提问来源于stack exchange，提问作者Harshit Kakkar