Examples of scala’s method of reading txt files

Time:2019-9-8

The file formats are as follows

   

package txt
 
object ReadTxt {
 
 def readFromTxtByLine(filePath:String) = {
 // Importing Scala's IO package
 import scala.io.Source
 // Read the file with the specified UTF-8 character set. The first parameter can be a string or java.io.File
 val source = Source.fromFile(filePath, "UTF-8")
 // Or take all the lines in the file
 //val lineIterator = source.getLines()
 // Iterative printing of all rows
 //lineIterator.foreach()
 // Put all rows in an array
 val lines = source.getLines().toArray
 source.close()
 //println(lines.size)
 lines
 }
 
 def LackingFileUtil(array:Array[String],keyMap:Map[String,String]) = {
 // Traversing Array/Array Buffer with for loop and until
 // Make until a function provided by RichInt
 var lockMapList = List[Map[String,String]]()
 for (i <- 0 until array.length){
  if(i==0){
  val lineArray = array(i).trim.split("\|")
  lockMapList = lockMapList :+ Map("id"->lineArray(0).trim,"name"->lineArray(1).trim,"pass"->lineArray(2).trim)
  }else{
  val lineArray = array(i).split(",")
  if(lineArray.length==3){
   lockMapList = lockMapList :+ Map("id"->lineArray(0).trim,"name"->lineArray(1).trim,"pass"->lineArray(2).trim)
  }else if(lineArray.length==2){
   val pass = keyMap.getOrElse(lineArray(0).trim,lineArray(1).trim)
   lockMapList = lockMapList :+ Map("id"->lineArray(0).trim,"name"->lineArray(1).trim,"pass"->pass.trim)
  }else if(lineArray.length==1){
   lockMapList = lockMapList :+ Map("id"->lineArray(0).trim,"name"->"","pass"->"")
  }else{
   lockMapList = lockMapList :+ Map("id"->"-","name"->"","pass"->"")
  }
  }
  //println(array(i))
 }
 lockMapList
 
 // Jump through Array/Array Buffer
 /*for(i <- 0 until (array.length, 2))
  println(array(i))*/
 
 // Traversing Array/Array Buffer from the tail
 /*for(i <- (0 until array.length).reverse)
  println(array(i))*/
 
 // Traversing Array / Array Buffer with Enhanced for Loop
 /*for (e <- array){
  println(e)
  e.split(",").mkString
 }*/
 
 }
 
 def KeyFileUtil(array:Array[String]) = {
 var keyMapList = Map[String, String]()
 for (i <- 0 until array.length) {
  //println(array(i))
  val lineArray = array(i).trim.split(",")
  //println(lineArray.size)
  if(lineArray.size==2){
  keyMapList = keyMapList ++ Map(lineArray(0).trim -> lineArray(1).trim)
  }else if(lineArray.size==1){
  keyMapList = keyMapList ++ Map(lineArray(0).trim -> "")
  }else{
  keyMapList = keyMapList ++ Map("-" -> "")
  }
 }
 keyMapList
 }
 
 def isEmpty(s: String): Boolean = (s == null) || (s.size==0)
}

package txt
 
import scala.reflect.io.File
 
 
object App {
 
 def main(args: Array[String]): Unit = {
 
 val key = ReadTxt.readFromTxtByLine("D:"+File.separator+"workspace"+File.separator+"source.txt")
 //println(key.mkString)
 val keyMap = ReadTxt.KeyFileUtil(key)
 
 //println(keyMap)
 
 
 val lack = ReadTxt.readFromTxtByLine("D:"+File.separator+"workspace"+File.separator+"source1.txt")
 
 val lockMapList = ReadTxt.LackingFileUtil(lack,keyMap)
 
 println(lockMapList)
 
 
 }
}

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