scala 读取txt文件的方法示例

文件格式分别如下

package txt

object ReadTxt {

def readFromTxtByLine(filePath:String) = {
//导入Scala的IO包
import scala.io.Source
//以指定的UTF-8字符集读取文件，第一个参数可以是字符串或者是java.io.File
val source = Source.fromFile(filePath, "UTF-8")
//或取文件中所有行
//val lineIterator = source.getLines()
//迭代打印所有行
//lineIterator.foreach()
//将所有行放到数组中
val lines = source.getLines().toArray
source.close()
//println(lines.size)
lines
}

def LackingFileUtil(array:Array[String],keyMap:Map[String,String]) = {
// 使用for循环和until遍历Array / ArrayBuffer
// 使until是RichInt提供的函数
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

// 跳跃遍历Array / ArrayBuffer
/*for(i <- 0 until (array.length, 2))
 println(array(i))*/

// 从尾部遍历Array / ArrayBuffer
/*for(i <- (0 until array.length).reverse)
 println(array(i))*/

// 使用“增强for循环”遍历Array / ArrayBuffer
/*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)

}
}

来源：https://blog.csdn.net/qq_29777207/article/details/81873511