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)
 
 
 }
}

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