scala 读取txt文件的方法示例
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2022-05-12 13:14:13
文件格式分别如下
package txt
object readtxt {
def readfrom...
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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